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[Powered by Google Translate] [Ħsejjes STATIC ELECTRONIC]

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ROB: Okay, sabiex dak li aħna biss miġjuba inti tkun CS50 Spazji.

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ALI: Stenna, stenna back up.

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Merħba għas-sezzjoni!

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ROB: Merħba għas-sezzjoni!

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ALI:! Yay

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ROB: Supersection!

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ALI: Ninsab Ali u dan huwa Rob.

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Okay, issa aħna ser jispjegaw Spazji.

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ROB: Allura dak li aħna biss miġjuba inti tkun CS50 Spazji.

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Int ser tkun qed tuża dan il-lott ta 'f'taqsimiet tiegħek dan is-semestru.

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Bażikament, aħna stajt diġà kellha inti tniżżel il-appliance.

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U inti tista 'taħseb CS50 Spazji bħala interface web tkellem ma' strument

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li għandna fuq xi server x'imkien.

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Allura inti tista 'taħdem il-kodiċi tiegħek f'dan interface, u aħna inneħħu

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tara kif tagħmel affarijiet.

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Tista 'wkoll tħares lejn il-kodiċi ta' nies oħra fit-taqsima, u -

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ALI: U kif xi nies sabu barra, inti tista 'chat nies fuq il-ġenb.

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U aħna ser kollha tara dan, wisq, b'tali mod li eċċitanti.

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Come fuq fil, come u ipoġġu.

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Ħu sedil.

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>> ROB: Allura, sezzjonijiet huma -

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ALI: No, no, inti guys tista 'toħroġ.

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ROB: Sezzjonijiet ser ikunu ferm aktar interattiv dan is-semestru.

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ALI: Oh, huwa simili -

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Oh.

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Okay, berred.

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Mela jekk inti guys huma biss ġejjin fil, inti tista 'tmur għall din ir-rabta, jekk nista' nikseb

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hemm, hemm dritt.

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Ma nistgħux verament tikteb dan, għaliex ma jkunx hemm spazju abbord, iżda din ir-rabta

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dritt hawn, tmur f'dak fuq il-kompjuters tiegħek, u inti ser tidħol CS50

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Spazji, li hija ħaġa pretty jibred.

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Okay.

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Għandek xi problema?

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ROB: Allura inti tista 'ssib l-problemi -

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għandna bżonn li tkun tista 'tikteb din x'imkien.

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Mela jekk inti tmur cs50.net/psets u dan huwa l-supersection Hacker -

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u inti tmur fis-Edizzjoni Hacker ta pset waħda, tħares lejn l-ispeċifikazzjoni

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x'imkien isfel fuq il-paġna -

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>> ALI: Allura bażikament, filwaqt li Rob tfittex, dak li aħna qed tmur biex tagħmel

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Illum it-taqsima hija hemm sezzjoni ta 'problemi -

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ROB: - fuq paġna 8.

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ALI: - imsejħa sezzjoni ta 'problemi -

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ROB: Sezzjoni ta 'mistoqsijiet.

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ALI: Jiddispjacini, sezzjoni ta 'mistoqsijiet.

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U dawk huma dak li aħna qed tmur biex jmorru fuq -

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dawn huma dak li aħna qed tmur biex jmorru fuq llum fit-taqsima.

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U aħna qed tmur għall-kodiċi fuq CS50 Ispazji, u nisperaw li se jaħdmu.

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U nistgħu biss jitkellmu permezz tagħhom.

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U inti guys tista 'tistaqsi mistoqsijiet kulmeta tħoss -

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>> ROB: Allura dan huwa jkollna li tkun ħaġa komuni ma psets aktar.

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Naħseb ma 'dan wieħed, din tgħid li inti ma għandekx biex l-idejn dawn il-mistoqsijiet pulzieri

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Iżda l-idea hija li dawn il-mistoqsijiet huma mqiegħda fis-pset, u inti tista 'toħroġ

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is-sezzjoni li jkollhom dawk il-mistoqsijiet jitwieġbu.

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Jew jekk inti ma jaslu għal taqsima, inti tista 'tweġibhom fuq tiegħek jew ikseb

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jgħinu fil-ħinijiet tal-uffiċċju jew xi ħaġa.

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Iżda dawn huma mistoqsijiet li suppost li prep lilek għall-sett problema.

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U fuq il-edizzjoni Hacker, lott tal-mistoqsijiet jista 'jkun biss dwar

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jespandi t-tagħrif attwali tiegħek KEFA.

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ALI: Yep, pretty ħafna.

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>> Okay, hekk, huwa kulħadd fuq CS50 Spazji?

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Hi, come pulzieri

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SPEAKER 1: Nistgħu ara l-URL waħda aktar ħin?

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Rob: Yeah, dan se jkun aktar faċli ladarba inti fil-fatt fit-taqsimiet tiegħek, u

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TF tiegħek biss tista 'email inti l-URL qabel.

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ALI: Yay, tieħu sedil.

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Hemm sedili hawn.

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Il-quddiem ma tkunx dik ħażina.

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What?

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Allura, CS50 Spazji, aħna jkollna hemmhekk.

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Ħadd ma jkollu xi mistoqsijiet qabel we jsibu rwieħhom - liema?

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ROB: Hemm lanqas ebda ġibs.

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[Inaudible]

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ALI: Jiddispjacini.

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Inti tista 'tuża fingernails tiegħek?

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Aħna fil-kamra baxx ħafna ta 'teknoloġija għal klassi ħafna ta' teknoloġija għolja.

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Okay, huwa tip ta 'kulħadd tajba?

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Ħadd ma jkollu għad mistoqsijiet dwar dan?

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Kif għidt qabel, aħna qed tmur biex jgħaddu mill-taqsima tal-mistoqsijiet fl-

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l-ispeċifikazzjonijiet pset.

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Allura hemm biss ftit ta 'problemi li aħna qed tmur biex

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kodiċi fil CS50 Spazji.

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Huwa kulħadd tajba?

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Okay.

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Tajba?

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ROB: Do ikollok xi laptop?

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ALI: Tista hang out ma Lucas.

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Hu seduta dritt li jmiss lilek.

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Ħin tgħaqqid.

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>> ROB: Allura, tibda bil-ewwel problema?

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ALI: Yeah.

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Aħna tista 'tibda.

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Tixtieq lili -

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I tista 'tmur.

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Allura, aħna ser imorru għall-specs pset.

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Oh, għaliex hi -

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ROB: Kontroll.

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ALI: Okay, hekk aħna nidħlu tweġiba dawn l-affarijiet kif ukoll?

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ROB: Oh, yeah.

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Allura -

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ALI: Oh, ma xorts starring kulħadd watch Rob tal-?

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Okay, berred.

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ROB: Yeah, ma naħsibx li aħna neċessarjament mistenni li jkollhom

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jaraw li qabel ma din it-taqsima, iżda nistgħu jiddiskutu dawk

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problemi minn qabel, peress li huma taħt it-taqsima ta 'l-affarijiet mistoqsijiet.

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Mela jekk int ma jarah dan, tinkwetax.

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Dawk li jkollhom tista 'tipprova u risposta.

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>> Għalhekk, l-ewwel domanda, liema huwa pre-proċessur, kif ma # Jinkludu

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jirrelataw?

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Allura ħadd ma jkollu tweġiba għal dan?

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ALI: You guys tista 'tkellem out.

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Sure, imorru quddiem.

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SPEAKER 2: # Jinkludu xi kodiċi pre-miktub, u minflok

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ikkupjar u pasta fil-programm tiegħek, billi sempliċiment tgħid jinkludu dan,

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il-pre-proċessur jaf li huwa hemmhekk u li għandha jżidu b'mod

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wara jew qabel kull ħaġ'oħra jiġri.

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ALI: Yeah, biża '.

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Kessaħ.

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ROB: Allura meta int fil-fatt kumpilazzjoni ta 'programm, il-pre-proċessur hija din

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1 pass.

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Kumpilazzjoni jiġri f'erba 'passi kbar.

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Allura l-proċessur qabel huwa l-waħda kbira ewwel, u huwa dan Guy li tmur

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permezz u jistenna għal kulħadd ta 'dawn is-simboli hash.

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U kull linja li tibda ma 'hash, il-proċessur qabel it-iħares lejn dan u jara

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jekk jista pproċessata.

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Allura # Jinkludu jirrakkonta l-pre-proċessur tfittex xi cs50.h

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fajl u biss kopja u paste kontenut tagħha fil dan il-fajl.

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Allura inti tista 'verament # Jinkludu xi ħaġa li trid, imma hija l-aktar se tkun

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Fajls. H.

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Aħna ma gotten biex jiddefinixxu # għadhom, b'tali mod li ma jimpurtax.

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ALI: Yeah, aħna qed tajba fuq li wieħed.

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Ħadd ma jkollu xi mistoqsijiet dwar dan?

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Are we tajba?

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Li jmiss kwistjoni.

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>> SPEAKER 3: Fil-qosor, kien hemm xi ħaġa dwar ċ ukoll.?

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Hija li relevanti jew hija irrilevanti?

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ROB: Dwar ċ mal-proċessur pre-.?

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SPEAKER 3: Yeah, jew ma nagħmel xi ħaġa up?

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ROB: Allura l-qasira setgħu ġew juri pre-proċessar dan il-fajl u

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. outputting lil xi fajl c, sabiex inti tista 'pre-proċess dan il-fajl -

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meta inti biss run simili, jagħmlu bonjour jew hello.c clang, inti tagħmel dak kollu

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il-kumpilazzjoni fi stadju wieħed kbir.

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Iżda int tista 'tagħmel dan b'mod espliċitu fil-passi separati tagħha.

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Allura l-ewwel inti tista 'pre-tipproċessaha.

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Imbagħad int tista 'tiġbor, allura inti tista' tiġbor, u allura inti tista 'rabta.

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Aħna ser jiksbu għal dawk oħrajn.

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Iżda qabel l-ipproċessar, inti tip ta 'pre-proċess, u mbagħad tmur fil

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fajl ieħor c..

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Minħabba qabel l-ipproċessar ma verament tbiddel xejn.

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Huwa biss mazz ta 'kopja u pasta.

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Inti tista 'manwalment kopja u paste it yourself.

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ALI:. U li tkun ċara, il-fajl huwa fajl c C, dan huwa

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miktub fil-kodiċi C.

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Allura huwa għaddej minn kodiċi C għall-kodiċi C.

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Int sempliċement tiżdied il-kodiċi aktar mal-lira.

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ROB: Meta inti pre-pproċessati huwa, huwa għadu fajl C valida.

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SPEAKER 3: Okay.

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ALI: Good kwistjoni.

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I simili li.

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Okay, mistoqsija li jmiss.

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>> X'hemm-kumpilatur?

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Kulħadd?

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Iva.

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SPEAKER 4: Tibdel il-kodiċi ipproċessat minn qabel fis assemblaġġ.

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ALI:. Perfect

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ROB: Iva.

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ALI:. Kessaħ

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ROB: Allura dak hu l-kumpilatur qed tagħmel speċifikament

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meta aħna qed jużaw clang.

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F'sens ġenerali ħafna, l-kompilatur huwa biss simili tieħu code f'lingwa waħda

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u biex dan jinqeleb lingwa oħra.

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Għalhekk fl C -

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jew, ukoll, clang qed tieħu kodiċi li fil Ċ u tittrasforma lill-assemblea.

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U inti ma għandekx tkun kapaċi jifhmu l-assemblaġġ fil-livelli kollha.

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Imma dak li l-lingwa li huwa biex dan jinqeleb.

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>> ALI: Okay.

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U mbagħad, x'hemm persuna li timmonta?

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Kulħadd?

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SPEAKER 5: [inaudible] għall binarju?

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ALI: Jiddispjacini, liema?

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SPEAKER 5: [inaudible] għall binarju?

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ROB: Yep.

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ALI: Iva.

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ROB: Allura l-muntatur -

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kodiċi assemblaġġ huwa tassew, tassew qrib għal dak il-kompjuter tiegħek jista 'jifhem,

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iżda tiftakar li ma pjuttost jifhmu t-test

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li huwa kodiċi assemblaġġ.

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Ikollok bżonn li jissarfu fi 1s u 0s dritta.

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Huwa simili proċess ta 'traduzzjoni diretta.

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Nistgħu biss jagħtuk tabella li mapep liema kull

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istruzzjoni assemblaġġ tfisser.

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Iżda l-muntatur hija biss tagħmel din it-traduzzjoni għalik.

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Huwa jittrasforma l-kodiċi assemblaġġ fis 1s u 0s.

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>> ALI: U mbagħad, għall-aħħar wieħed, x'hemm linker?

195
00:08:30,870 --> 00:08:35,070
U kif ma 'lcs50 jirrelataw?

196
00:08:35,070 --> 00:08:37,010
Kulħadd?

197
00:08:37,010 --> 00:08:41,440
ROB: Dan huwa l-agħar u l-inqas spjegat 1 fil-video kompilatur.

198
00:08:41,440 --> 00:08:48,980
ALI: Hawn xi ħadd ftakar jaraw-lcs50 fil-kmand?

199
00:08:48,980 --> 00:08:50,690
SPEAKER 6: Meta inti marru għall-għamla.

200
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ALI: Huwa fl-għamla.

201
00:08:51,980 --> 00:08:55,780
Yeah, berred, okay.

202
00:08:55,780 --> 00:09:02,024
Hemm xi guesses jew vagi - iva, imorru.

203
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SPEAKER 7: M'inix ċert, peress qasir tiegħek kien verament [inaudible], iżda ma kien

204
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xi ħaġa dwar kif isir fajls separati ma 'kull librerija u mbagħad tqegħid

205
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ilkoll flimkien f'wieħed librerija?

206
00:09:13,620 --> 00:09:14,400
ROB: Iva.

207
00:09:14,400 --> 00:09:23,000
Allura meta jkollok hello.c, huwa programm verament sempliċi.

208
00:09:23,000 --> 00:09:25,570
Int verament biss tagħmel ħaġa waħda fiha.

209
00:09:25,570 --> 00:09:27,400
Imma meta ikollok fi programmi oħra -

210
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u I raden anke meta inti GetString fil-programmi tiegħek, għandek bżonn biex tibda

211
00:09:31,700 --> 00:09:33,830
inklużi fajls oħra.

212
00:09:33,830 --> 00:09:38,000
Allura l-librerija CS50 hija waħda tali file li fih għandna l-implimentazzjonijiet

213
00:09:38,000 --> 00:09:40,750
ta GetString u GetInt u dawk kollha affarijiet.

214
00:09:40,750 --> 00:09:45,540
Allura dak li l-linker ma huwa tmur madwar tfittex kollha permezz ta 'dawn l-

215
00:09:45,540 --> 00:09:49,400
fajls, jaraw fejn il-funzjonijiet huma definiti, jagħmlu ċert li meta I call

216
00:09:49,400 --> 00:09:52,440
GetString x'imkien, huwa jaf li GetString ifisser li huwa l-

217
00:09:52,440 --> 00:09:54,910
GetString fuq fil-librerija CS50.

218
00:09:54,910 --> 00:09:58,895
Allura l-linker biss tieħu dawn il-fajls, smashes minnhom flimkien, u issa

219
00:09:58,895 --> 00:10:01,020
għandek eżekutibbli.

220
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Allura wieħed iżomm f'moħħu, jekk inti qed tuża l-librerija CS50, inti għandek bżonn kemm il-

221
00:10:05,600 --> 00:10:10,370
# Jinkludu fil-quċċata, u allura wkoll fil-kmand għamla tiegħek, kif inti

222
00:10:10,370 --> 00:10:12,630
qal, int trid li jkollha il-lcs50.

223
00:10:12,630 --> 00:10:15,720
Allura inti tista 'mhux biss jkollhom waħda.

224
00:10:15,720 --> 00:10:18,294
Allura dan huwa biss xi ħaġa li wieħed iżomm f'moħħu għal referenza futura.

225
00:10:18,294 --> 00:10:22,550
>> SPEAKER 8: Allura, ejja ngħidu kien hemm ieħor librerija, bħall cs51.h, kieku aħna

226
00:10:22,550 --> 00:10:26,780
għandhom ukoll add-lcs51?

227
00:10:26,780 --> 00:10:32,390
ROB: Ir-raġuni biss din il-lcs50 jaħdem perfettament huwa għaliex għandna dak is-sett

228
00:10:32,390 --> 00:10:35,800
up f'post speċifiku fl-apparat tiegħek sabiex tkun taf liema

229
00:10:35,800 --> 00:10:38,550
-Lcs50 mezzi.

230
00:10:38,550 --> 00:10:43,240
Nistgħu biss jagħtuk fajl cs50.c, u allura inti tista 'josservawha, qal

231
00:10:43,240 --> 00:10:49,050
Clang hello.c cs50.c, u allura jagħmel eżekutibbli tiegħek billi

232
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dawk il-fajls 2 flimkien.

233
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Huwa jaf li l-lcs50 ifisser cs50.c fuq f'xi direttorju li aħna speċifikat

234
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apparat tiegħek.

235
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Mela jekk inti riedu cs51.c li jkun speċifikabbli bi ftit qal-lcs51,

236
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allura aħna wkoll bżonn li titqiegħed f'dak direttorju għalhekk jaf fejn

237
00:11:06,760 --> 00:11:08,636
jfittxuh.

238
00:11:08,636 --> 00:11:10,510
ALI: Liema kienet il-mistoqsija tiegħek?

239
00:11:10,510 --> 00:11:13,975
>> SPEAKER 7: Għaliex għandek biex torbot l-CS50

240
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jekk - wasn't ikun kopja / pasted fl-ewwel skala meta inti pre-pproċessati dan?

241
00:11:18,940 --> 00:11:19,700
ALI: Do inti tixtieq li tieħu dan?

242
00:11:19,700 --> 00:11:20,880
ROB: Sure.

243
00:11:20,880 --> 00:11:28,028
Allura l-fajl cs50.h hija separata mill-fajl C cs50.c.

244
00:11:28,028 --> 00:11:33,652
Have you gotten li jiffunzjonaw prototipi fil-klassi?

245
00:11:33,652 --> 00:11:34,350
Okay.

246
00:11:34,350 --> 00:11:40,255
Allura bażikament, il-fajl cs50.h huwa biss se kopja u paste -

247
00:11:40,255 --> 00:11:44,040
ALI: Do you guys taf liema firem huma?

248
00:11:44,040 --> 00:11:46,580
Okay, so pretty ħafna, jekk inti tħares lejn -

249
00:11:46,580 --> 00:11:50,530
ROB: Ejja nippretendu cs50.h ma jkunx hemm.

250
00:11:50,530 --> 00:11:52,960
Issa dan il-fajl -

251
00:11:52,960 --> 00:11:56,090
int tagħmel string s = GetString.

252
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Imma meta aħna ħadthom gotten għal dan il-punt fil-kodiċi, hija m'għandha l-ebda idea dak li

253
00:11:59,350 --> 00:12:00,230
GetString huwa.

254
00:12:00,230 --> 00:12:02,600
Huwa jaf huwa funzjoni, peress li int ssejjaħ dan.

255
00:12:02,600 --> 00:12:06,500
Iżda dan ma jafux li huwa fil-fatt suppost li jirritornaw string.

256
00:12:06,500 --> 00:12:14,530
Allura bħal I said, spag s = GetInt, dan ma jagħmel ebda sens, peress li

257
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int iffirmar integer għal string.

258
00:12:17,530 --> 00:12:22,270
Iżda dan ma jafux li GetString ma jagħmel sens, għax ma

259
00:12:22,270 --> 00:12:24,380
jafu li GetString jirritorna string.

260
00:12:24,380 --> 00:12:28,220
Allura dak cs50.h jgħid xi ħaġa bħal din.

261
00:12:33,070 --> 00:12:37,750
ALI: Allura dak Rob qed ittajpjar huwa, huwa wegħda b'mod li huwa għaddej biex

262
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jkollhom din il-funzjoni tissejjaħ GetString.

263
00:12:41,280 --> 00:12:45,250
ROB: Dan huwa dak kollu li huwa cs50.h ikkupjar u pasta fil hawn, kif ukoll

264
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kif GetInt u dawk kollha affarijiet.

265
00:12:47,620 --> 00:12:51,520
U dan biss jgħid li GetString ma ritorn string.

266
00:12:51,520 --> 00:12:54,830
Ma tafx kif dan implimentat s'issa, iżda meta aħna nikseb li din il-linja, issa

267
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huwa jaf li b'mod korrett jirritorna string.

268
00:12:57,760 --> 00:13:03,022
>> SPEAKER 9: Allura jekk aħna ma jolqot bl-ħaġa <cs50.h> # Jinkludu u minflok

269
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biss kiteb il-prototip għall-dawk li aħna attwalment tmur għall-użu?

270
00:13:07,130 --> 00:13:07,330
ROB: Yeah.

271
00:13:07,330 --> 00:13:08,870
Mela ejja run dan.

272
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SPEAKER 9: Huwa?

273
00:13:09,110 --> 00:13:13,670
Għalhekk, fil-kontumaċja, hija ser tagħmel l-l-to CS50 biss għaliex -.

274
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ROB: - espressjoni.

275
00:13:14,740 --> 00:13:19,370
ALI: Iva, għaliex kif inti qal, huwa fil-fajl għamla.

276
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ROB: cs50.h wkoll jiġri li jkun * char typedef għal sekwenza.

277
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Tista 'jinjora kompletament dak li jfisser għal issa.

278
00:13:26,950 --> 00:13:31,430
Iżda dan huwa wkoll xi ħaġa inklużi fil cs50.h.

279
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Allura issa l-affarijiet maħduma perfettament multa.

280
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Hija tmur eżattament l-istess kif kien meta aħna biss kellhom

281
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l-# Jinkludu.

282
00:13:45,120 --> 00:13:49,200
U hekk inklużi cs50.h jiġri li over-Inkludi affarijiet li għandek bżonn -

283
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simili, ma tużax il-GetInt f'dan il-programm, iżda ma jimpurtax.

284
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Hija ser biss jinjoraha.

285
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ALI: U allura meta inti tagħmel l-lcs50 hawn fuq u dritt hawn, dak li għaddej

286
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fuq hija li huwa jkollu l-kodiċi implimentabbli attwali.

287
00:14:05,290 --> 00:14:07,530
Allura dak fejn fil-fatt hu, tagħmel l -

288
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miktub l-kodiċi għall GetString.

289
00:14:09,090 --> 00:14:11,180
Allura huwa mhux biss wegħda aktar.

290
00:14:11,180 --> 00:14:16,520
Huwa fil-fatt għaddejjin u tieħu l-sekwenza u dak kollu li Jittieħed.

291
00:14:16,520 --> 00:14:17,600
Jagħmel sens?

292
00:14:17,600 --> 00:14:22,640
Mistoqsijiet? Kull dritt.

293
00:14:22,640 --> 00:14:24,466
Fażola Kessaħ.

294
00:14:24,466 --> 00:14:27,630
>> ROB: Issa nistgħu jimxu fuq kodiċi attwali.

295
00:14:27,630 --> 00:14:28,780
ALI: Okay.

296
00:14:28,780 --> 00:14:33,340
Allura hawnhekk huwa l-problema l-ewwel.

297
00:14:33,340 --> 00:14:36,910
Għalhekk jgħid jikteb programm li tinkoraġġixxi l-utent għal lowercase

298
00:14:36,910 --> 00:14:40,540
ittra u mbagħad tikkonverti għall uppercase mingħajr l-użu bitwise

299
00:14:40,540 --> 00:14:43,590
operazzjonijiet, kif fis-output kampjun hawn taħt.

300
00:14:43,590 --> 00:14:48,780
Allura tista 'tara, inti tmexxi l-programm ma' l-. / A.out, u allura int

301
00:14:48,780 --> 00:14:53,320
se jitqiegħdu fil zghar ta ', u mbagħad program tiegħek għandhom jagħtu kapital

302
00:14:53,320 --> 00:15:00,590
A. Allura għaliex ma inti guys kollha jagħtu din tir fuq CS50 Spazji?

303
00:15:00,590 --> 00:15:03,360
Allura inti guys kollha jistgħu jmorru hawn.

304
00:15:03,360 --> 00:15:06,650
U inti tista 'tħassar l-kodiċi fil hawn.

305
00:15:06,650 --> 00:15:12,140
U allura inti tista 'tmur quddiem u tibda kodifikazzjoni tal-ħaġa.

306
00:15:12,140 --> 00:15:14,590
ROB: Int ser ikollok probabbilment jridu jużaw GetChar, li l-

307
00:15:14,590 --> 00:15:16,190
inklużi fil-librerija CS50.

308
00:15:16,190 --> 00:15:18,770
ALI: I raden jista 'jkun aħjar jekk inti tiffranka l-parti ta' fuq.

309
00:15:21,452 --> 00:15:23,805
Allura inti tista 'tixtieq li biss jibdlu l-għalf fin-nofs.

310
00:15:28,710 --> 00:15:29,070
Jimxi 'l quddiem u jaħdmu.

311
00:15:29,070 --> 00:15:30,530
Ħossok liberu li jaħdmu ma 'xulxin.

312
00:15:30,530 --> 00:15:32,360
Rob: U inti tista 'tistaqsi mistoqsijiet jekk ikollok -

313
00:15:32,360 --> 00:15:33,450
>> SPEAKER 10: Liema hija operazzjoni bitwise?

314
00:15:33,450 --> 00:15:35,100
ROB: Allura, jinjora li għal din il-problema.

315
00:15:35,100 --> 00:15:36,330
ALI: Jekk inti ma taf, li tajjeb.

316
00:15:36,330 --> 00:15:38,300
ROB: Aħna qed tmur għall-użu fil-problema li jmiss.

317
00:15:38,300 --> 00:15:40,750
Imma jekk inti ma tkunx taf liema operatur bitwise hija, li l-multa.

318
00:15:40,750 --> 00:15:43,575
SPEAKER 10: Jinsab li bħal ddawwar il-kodiċi ASCII?

319
00:15:43,575 --> 00:15:44,050
ALI: Le

320
00:15:44,050 --> 00:15:44,750
ROB: Le

321
00:15:44,750 --> 00:15:46,220
Tista 'tagħmel dan għal din il-problema.

322
00:15:46,220 --> 00:15:48,280
SPEAKER 10: Kif inti tagħmel dan?

323
00:15:48,280 --> 00:15:52,460
Mela jekk biss kelli x'imkien jiktbu -

324
00:15:52,460 --> 00:15:54,670
ALI: Jew xi ħaġa li tikteb bil.

325
00:15:54,670 --> 00:15:56,780
ROB: I jistgħu biss tip ta 'tip fis dan.

326
00:15:56,780 --> 00:15:59,045
ALI: Tip fil-quċċata.

327
00:15:59,045 --> 00:16:01,390
ROB: Oh, jien bilqiegħda fuq mic.

328
00:16:01,390 --> 00:16:10,860
>> Allura, rajna fil lecture li l-valur ASCII tal-kapital A huwa 65.

329
00:16:10,860 --> 00:16:13,670
U l-kapital B se jkunu 66, u l-bqija.

330
00:16:13,670 --> 00:16:20,860
Allura inti tista litteralment użu "A" li tfisser l-għadd 65.

331
00:16:20,860 --> 00:16:24,600
Bħal, dan huwa l-valur 65.

332
00:16:24,600 --> 00:16:30,950
I tista 'tagħmel xi ħaġa simili int x = 100 -' A '. U issa x se jkollu l-valur

333
00:16:30,950 --> 00:16:33,810
100-65.

334
00:16:33,810 --> 00:16:36,708
ALI: Inti tista 'taħdem din u juru li.

335
00:16:36,708 --> 00:16:38,420
Oh, forsi le.

336
00:16:38,420 --> 00:16:38,600
Never mind.

337
00:16:38,600 --> 00:16:40,970
ROB: I kellha jistampaw.

338
00:16:40,970 --> 00:16:43,730
SPEAKER 10: Kif tista 'taqleb lura għall-karattru?

339
00:16:43,730 --> 00:16:46,800
ALI: Mela jekk inti don 't -

340
00:16:46,800 --> 00:16:51,450
inti biss forza li tkun A char, ugwali.

341
00:16:51,450 --> 00:16:53,630
ROB: Allura hemm -

342
00:16:53,630 --> 00:16:58,440
id-distinzjoni bejn char u integer huwa biss f'termini ta 'daqs.

343
00:16:58,440 --> 00:17:01,230
Allura integer jiġri li jkun kapaċi li jirrappreżentaw affarijiet up

344
00:17:01,230 --> 00:17:02,600
li, bħal, 4000000000.

345
00:17:02,600 --> 00:17:05,839
A char huwa kapaċi biss li jirrappreżentaw l-affarijiet sa 255.

346
00:17:05,839 --> 00:17:08,390
Imma m'hemm l-ebda differenza bejniethom minbarra dan.

347
00:17:08,390 --> 00:17:12,339
Allura inti tista 'tgħid char c = 65.

348
00:17:12,339 --> 00:17:24,204
Dak qisna qed ngħidu ċ char ugwali "A".

349
00:17:24,204 --> 00:17:25,210
ALI: Oh, no.

350
00:17:25,210 --> 00:17:26,710
Ma attwalment tiffranka l-affarijiet.

351
00:17:26,710 --> 00:17:28,130
ROB: Le, inti ma tistax tagħmel dan.

352
00:17:28,130 --> 00:17:31,610
ALI: Li jinsab biss -

353
00:17:31,610 --> 00:17:34,920
[Groans]

354
00:17:34,920 --> 00:17:40,700
>> ROB: Okay, sabiex dak Ali biss kiteb kien programm li prints 1 100 -

355
00:17:40,700 --> 00:17:46,290
"A" bħala numru sħiħ, li kien 35, kif aħna nistennew, għaliex 100 mingħajr l-ASCII

356
00:17:46,290 --> 00:17:48,580
valur ta 'A huwa 65.

357
00:17:48,580 --> 00:17:54,100
Imbagħad hi stampata bl-użu% c, li jfisser tinterpreta dan bħala char.

358
00:17:54,100 --> 00:17:57,050
Allura 100 - a huwa 35.

359
00:17:57,050 --> 00:18:00,990
Interpretazzjoni li bħala karattru jiġri li jkun is-simbolu hash.

360
00:18:00,990 --> 00:18:06,160
Jekk inti tħares lejn asciitable.com jew kwalunkwe, tkun taf tara li 35 hija l-

361
00:18:06,160 --> 00:18:07,410
hash simbolu.

362
00:18:09,940 --> 00:18:12,700
ALI: Okay, xi kjarifiki oħra dwar il-problema?

363
00:18:16,000 --> 00:18:18,180
Okay, inti guys tista 'tmur quddiem u tagħmel dan imbagħad.

364
00:18:18,180 --> 00:18:20,330
Ħossok liberu li jistaqsu mistoqsijiet jew jitkellmu ma 'xulxin.

365
00:18:20,330 --> 00:18:24,390
Jew jekk int diġà sar, inti tista 'jirrilassaw.

366
00:18:24,390 --> 00:18:29,640
>> LUCAS: Dawn huma l-istess klassi, l-ittri lowercase fl-ordni u

367
00:18:29,640 --> 00:18:32,923
wkoll il-uppercase huma wkoll fl-ordni, għaliex dan huwa xi ħaġa utli għall-

368
00:18:32,923 --> 00:18:33,990
il-problema.

369
00:18:33,990 --> 00:18:35,620
ALI: punt Tajba, Lucas.

370
00:18:35,620 --> 00:18:37,430
Allura, ma inti guys kollha jiksbu dak?

371
00:18:37,430 --> 00:18:37,640
SPEAKER 11: Iva.

372
00:18:37,640 --> 00:18:39,535
Li kif inti tagħmel dan, id-dritt?

373
00:18:39,535 --> 00:18:39,960
ALI:. Dritt

374
00:18:39,960 --> 00:18:40,415
ROB: Yeah.

375
00:18:40,415 --> 00:18:47,270
SPEAKER 11: [inaudible]

376
00:18:47,270 --> 00:18:48,330
ALI: Kull dritt.

377
00:18:48,330 --> 00:18:49,350
ROB: X'inhu l-kwistjoni titlob?

378
00:18:49,350 --> 00:18:50,590
Just biex jikkonvertu -

379
00:18:50,590 --> 00:18:52,560
ALI: Ikkonverti l-zghar li uppercase l.

380
00:18:52,560 --> 00:18:53,100
Li minnu.

381
00:18:53,100 --> 00:18:54,700
ROB: Okay.

382
00:18:54,700 --> 00:18:56,180
ALI: Jekk aħna tikteb dan?

383
00:18:56,180 --> 00:18:59,340
I raden aħna ser biss ħarsa lejn xi ħadd ieħor.

384
00:18:59,340 --> 00:19:07,140
ROB: Allura għal dawk li jistgħu jkunu mwaħħla, b'tali mod -

385
00:19:07,140 --> 00:19:15,160
jekk ikolli xi ċ char, u ejja ngħidu li jiġri li jkun l-ittra D.

386
00:19:15,160 --> 00:19:20,760
Allura issa kif nista 'ċifra barra dak l-ittra tal-alfabett C hu?

387
00:19:20,760 --> 00:19:25,620
Mhux D, iżda li jfisser I, D jiġri li jkun l-ittra raba 'l-alfabett.

388
00:19:25,620 --> 00:19:28,910
U jekk aħna jibdew jingħaddu mid 0, allura huwa l-tielet ittra ta 'l-alfabett.

389
00:19:28,910 --> 00:19:36,240
Mela jekk A jkun 0, B hija l-1, Ċ huwa 2, D hija ta '3, kif nista' ċifra barra pożizzjoni int -

390
00:19:36,240 --> 00:19:40,780
f'liema pożizzjoni tal-alfabett C hija fil-?

391
00:19:40,780 --> 00:19:42,333
Ħadd ma jkollu xi ideat?

392
00:19:42,333 --> 00:19:45,440
ALI: Jien naħseb li qed kollha kodifikazzjoni.

393
00:19:45,440 --> 00:19:46,440
ROB: Xi ngħidu dwar l-ewwel waħda?

394
00:19:46,440 --> 00:19:48,608
SPEAKER 12: Sabiex ikun x'ikun A hija, naqqas l-ewwel waħda?

395
00:19:48,608 --> 00:19:49,030
ROB: Yeah.

396
00:19:49,030 --> 00:19:49,950
ALI: Yeah, biża '.

397
00:19:49,950 --> 00:19:51,765
Allura inti tista 'tagħmel kapital D -

398
00:19:51,765 --> 00:19:52,840
oh, sorry.

399
00:19:52,840 --> 00:19:55,620
Għandek tieħu l-karattru u inti naqqas l-ewwel waħda, kif għidt.

400
00:19:55,620 --> 00:20:03,940
ROB: Mela jekk D huwa xi ħaġa simili 68, u aħna naqqas A, li huwa 65, imbagħad irridu jiksbu

401
00:20:03,940 --> 00:20:07,130
3, tgħidilna li D huwa l-tielet ittra ta 'l-alfabett

402
00:20:07,130 --> 00:20:09,290
jibdew minn 0.

403
00:20:09,290 --> 00:20:11,310
Allura inti tista 'tuża dan.

404
00:20:11,310 --> 00:20:13,830
Issa nafu liema ittra tal-alfabett, f'termini ta '

405
00:20:13,830 --> 00:20:16,060
kapital ittri, jew -

406
00:20:16,060 --> 00:20:18,330
stajna nagħmlu l-istess ħaġa għall-ittri lowercase li ċifra barra dak

407
00:20:18,330 --> 00:20:20,170
zghar pożizzjoni aħna qed pulzieri

408
00:20:20,170 --> 00:20:25,690
U aħna jista 'juża dik l allura jikkonverti dak li uppercase-użu ta'

409
00:20:25,690 --> 00:20:26,970
idea simili ħafna.

410
00:20:31,470 --> 00:20:32,670
Itlob għall-suġġerimenti?

411
00:20:32,670 --> 00:20:35,810
>> ALI: Do you guys - stenna, I do not know kemm inti guys huma.

412
00:20:35,810 --> 00:20:40,060
Qed ħafna minnkom isir, int xorta taħdem, int staġnati?

413
00:20:40,060 --> 00:20:42,020
You guys tista shout out -

414
00:20:42,020 --> 00:20:42,330
mdendel.

415
00:20:42,330 --> 00:20:43,210
Persuna waħda s mdendel.

416
00:20:43,210 --> 00:20:43,560
Kessaħ.

417
00:20:43,560 --> 00:20:44,700
I-tendenza li jkunu mwaħħla, wisq.

418
00:20:44,700 --> 00:20:45,415
SPEAKER 13: jien jsir.

419
00:20:45,415 --> 00:20:46,410
ALI: Inti qed isir?

420
00:20:46,410 --> 00:20:47,480
Okay.

421
00:20:47,480 --> 00:20:47,935
Magħmul.

422
00:20:47,935 --> 00:20:49,300
SPEAKER 13: [inaudible]

423
00:20:49,300 --> 00:20:50,600
ALI: Yeah, berred.

424
00:20:50,600 --> 00:20:53,720
Inti tikkontrolla li huwa fil-forma zghar?

425
00:20:53,720 --> 00:20:56,730
Okay, berred.

426
00:20:56,730 --> 00:20:59,882
Fejn huma nies oħra?

427
00:20:59,882 --> 00:21:06,140
Did dan ħjiel jgħinuk, bħal un teħel lilek innifsek?

428
00:21:06,140 --> 00:21:09,778
SPEAKER 14: Mhux tassew, iżda biss għaliex, I do not know, jien ma

429
00:21:09,778 --> 00:21:11,590
diġestjoni encore.

430
00:21:11,590 --> 00:21:12,640
ALI: Okay, berred.

431
00:21:12,640 --> 00:21:13,431
Tixtieq li jippruvaw -

432
00:21:13,431 --> 00:21:16,140
jew ma inti tixtieq li tmur u jitkellmu?

433
00:21:16,140 --> 00:21:18,590
>> ROB: What I kienet se ngħid hu -

434
00:21:18,590 --> 00:21:19,890
hekk billi tuża dan.

435
00:21:19,890 --> 00:21:22,650
Tifhem kif sirna dak il-pożizzjoni ta 'l-alfabett

436
00:21:22,650 --> 00:21:24,820
l-ittra huwa fil-?

437
00:21:24,820 --> 00:21:30,616
SPEAKER 14: Okay, hekk meta inti tpoġġi l-affarijiet fil-kwotazzjoni waħda,

438
00:21:30,616 --> 00:21:35,030
li jirritorna numru?

439
00:21:35,030 --> 00:21:37,100
ROB: Iva.

440
00:21:37,100 --> 00:21:40,840
Se jiġu tradotti għall-valur ASCII li tirrappreżenta.

441
00:21:40,840 --> 00:21:43,350
Allura inti tixtieq li tmur għall-mejda ASCII jew kwalunkwe huwa?

442
00:21:46,456 --> 00:21:47,840
ALI: Wieħed biss minn dawn?

443
00:21:47,840 --> 00:21:49,970
ROB: Yep.

444
00:21:49,970 --> 00:21:55,270
Allura meta inti tpoġġi xi wieħed minn dawn is-simboli, jinjora ħafna ta 'l--

445
00:21:55,270 --> 00:21:56,450
ALI: [inaudible]

446
00:21:56,450 --> 00:21:57,620
ROB: Oh, bl-użu cursor.

447
00:21:57,620 --> 00:21:58,380
ALI: Yeah.

448
00:21:58,380 --> 00:21:59,690
Dan kien eċitanti.

449
00:21:59,690 --> 00:22:04,050
ROB: Allura, jinjora dawn dawk fuq ix-xellug, li huma simboli speċjali -

450
00:22:04,050 --> 00:22:08,520
jekk inti tpoġġi xi wieħed minn dawn is-simboli fil-kwotazzjonijiet wieħed, allura se jkun

451
00:22:08,520 --> 00:22:11,620
tradotti għal dan il-valur fuq ix-xellug.

452
00:22:11,620 --> 00:22:13,660
ALI: Dan huwa l-għadd deċimali għaliha.

453
00:22:13,660 --> 00:22:19,710
Huwa simili A logħbiet ma 65, B sa 66, u tkun taf avviż li dawn qed kollha fil

454
00:22:19,710 --> 00:22:21,540
ordni alfabetiku, li tagħmel differenza.

455
00:22:21,540 --> 00:22:27,110
Allura, kif Rob jgħid, qabel, f'dak il-kodiċi, konna kalkolu id-distanza mill-

456
00:22:27,110 --> 00:22:29,610
l-ewwel ittra, per se.

457
00:22:29,610 --> 00:22:32,820
U li ser ikunu l-istess, kemm jekk huwa uppercase jew zghar.

458
00:22:32,820 --> 00:22:38,390
ROB: Allura meta għamilna D, 68 minus A 65,, irridu jiksbu 3.

459
00:22:38,390 --> 00:22:42,370
Minħabba D huwa tliet pożizzjonijiet fil-alfabett.

460
00:22:42,370 --> 00:22:46,680
ALI: Mela allura kif tista 'tittraduċi li matul biex isibu l-d ftit?

461
00:22:46,680 --> 00:22:47,240
ROB: Yeah.

462
00:22:47,240 --> 00:22:52,230
Mela jekk ikolli 3 issa, I know I tixtieq li tmur tliet ittri fil--

463
00:22:52,230 --> 00:22:54,830
aħna jiġri li jkunu għaddejjin zghar issa, imma ejja ngħidu Irrid immur 3

464
00:22:54,830 --> 00:22:58,610
pożizzjonijiet fil-ġenb zghar ta 'affarijiet.

465
00:22:58,610 --> 00:23:01,400
Allura kif nista 'nagħmlu?

466
00:23:01,400 --> 00:23:04,240
Naf zghar a huwa 97.

467
00:23:04,240 --> 00:23:07,535
Allura kif nista 'nsib tliet pożizzjonijiet fil-ittri lowercase?

468
00:23:10,461 --> 00:23:11,934
>> SPEAKER 15: Għandi mistoqsija waħda fil-fatt.

469
00:23:11,934 --> 00:23:12,425
ALI: Yeah, imorru quddiem.

470
00:23:12,425 --> 00:23:14,880
SPEAKER 15: Allura għal dan, ma verament kwistjoni jekk naf din il-pożizzjoni,

471
00:23:14,880 --> 00:23:16,360
simili, I m'għandhomx bżonn din it-tabella.

472
00:23:16,360 --> 00:23:16,840
ROB: Nope.

473
00:23:16,840 --> 00:23:19,380
Inti qatt ma se jkollhom bżonn jużaw xi wieħed minn dawn in-numri.

474
00:23:19,380 --> 00:23:23,670
U dan huwa punt importanti fil-programmi tiegħek li int qatt ma għandhom hard

475
00:23:23,670 --> 00:23:25,500
kodiċi kwalunkwe minn dawn il-kostanti.

476
00:23:25,500 --> 00:23:31,190
Użu "A". qatt ma jużaw 65 jew 97.

477
00:23:31,190 --> 00:23:34,370
ALI: Dawk huma msejħa numri maġija, u dawn qed verament konfużjoni.

478
00:23:34,370 --> 00:23:37,080
Bħal, meta int debugging kodiċi, inti tista 'ma tiftakar dak

479
00:23:37,080 --> 00:23:38,020
inti użati minnhom għal.

480
00:23:38,020 --> 00:23:40,770
U għalina gradazzjoni kodiċi tiegħek, aħna mhux se verament jafu liema

481
00:23:40,770 --> 00:23:41,750
inti qed jużawhom għal.

482
00:23:41,750 --> 00:23:44,815
Allura huwa aħjar jekk inti attwalment jużaw il-karattri u għalhekk jagħmel

483
00:23:44,815 --> 00:23:46,065
aktar sens li n-nies.

484
00:23:49,460 --> 00:23:51,160
Okay, xi mistoqsijiet oħra?

485
00:23:51,160 --> 00:23:52,975
Huma aktar nies isir, jew -

486
00:23:56,243 --> 00:23:57,493
I raden nistgħu jiċċekkja.

487
00:23:59,870 --> 00:24:02,410
Huwa tassew creepy li tista 'tara kodiċi tan-nies.

488
00:24:02,410 --> 00:24:04,970
ROB: Yeah.

489
00:24:04,970 --> 00:24:06,410
Aħna ma jkollhom jagħmlu dan hawn.

490
00:24:06,410 --> 00:24:08,380
Ma nafux ismijiet tan-nies, lanqas.

491
00:24:08,380 --> 00:24:10,940
ALI: Oh yeah, sew li jagħmilha aħjar, hekk aħna ser tkun saħansitra aktar imparzjali

492
00:24:10,940 --> 00:24:14,820
minflok sempliċiment saltwarjament picking xi ħadd.

493
00:24:14,820 --> 00:24:15,360
Tinkwetax.

494
00:24:15,360 --> 00:24:16,265
I mhux se tagħmel dan.

495
00:24:16,265 --> 00:24:20,396
Jekk għandek affarijiet bl-addoċċ madwar - qatt f'moħħu.

496
00:24:20,396 --> 00:24:20,870
Okay.

497
00:24:20,870 --> 00:24:22,556
Kif huma nies jagħmlu?

498
00:24:22,556 --> 00:24:26,950
>> SPEAKER 17: Allura l-linja 9 għandu jistampa karattru?

499
00:24:26,950 --> 00:24:27,430
ROB: Iva.

500
00:24:27,430 --> 00:24:27,910
ALI: Yeah.

501
00:24:27,910 --> 00:24:30,770
Mela jekk inti tmur isfel -

502
00:24:30,770 --> 00:24:32,200
ROB: Oh, ma tistax tagħmel dan.

503
00:24:32,200 --> 00:24:35,400
ALI: Int ser ikollok tara li s-simbolu stampat hash.

504
00:24:35,400 --> 00:24:37,180
SPEAKER 17: Oh, okay.

505
00:24:37,180 --> 00:24:41,290
ROB: I raden mod ieħor inti tista 'tħares lejn l-affarijiet huwa li aħna qed istampar 2

506
00:24:41,290 --> 00:24:42,540
karattri.

507
00:24:44,500 --> 00:24:47,740
Ewwel wieħed aħna qed istampar hija l-ittra A.

508
00:24:47,740 --> 00:24:51,610
Il-wieħed li jmiss aħna qed istampar hija biss 65.

509
00:24:51,610 --> 00:24:54,450
Hija ser probabbilment Yell fil lili għal dawn.

510
00:24:54,450 --> 00:25:00,060
Allura jekk aħna biss run dan, inti ser ikollok avviż li prints A ħinijiet tnejn.

511
00:25:00,060 --> 00:25:02,070
Għaliex aħna qed tistaqsi lilha l-istess ħaġa.

512
00:25:02,070 --> 00:25:07,840
Aħna qed tistaqsi lill jistampaw l-ittra A. U allura aħna qed tistaqsi lill jistampaw il-

513
00:25:07,840 --> 00:25:13,820
numru 65 interpretata bħala karattru, li huwa l-istess ħaġa.

514
00:25:13,820 --> 00:25:15,100
ALI: Do ikollok xi ħaġa li jgħidu?

515
00:25:15,100 --> 00:25:18,150
Oh, biss kidding, sorry.

516
00:25:18,150 --> 00:25:20,640
Kull dritt, kif huma nies -

517
00:25:20,640 --> 00:25:22,280
ROB: Nistgħu biss walk permezz tiegħu.

518
00:25:22,280 --> 00:25:25,250
>> ALI: Okay, hekk kif taħseb li tibda?

519
00:25:25,250 --> 00:25:26,500
Kulħadd?

520
00:25:28,030 --> 00:25:34,486
Bħala ħjiel, irridu jiksbu xi ħaġa mill-poplu, mill-typers.

521
00:25:34,486 --> 00:25:36,850
SPEAKER 18: [inaudible]

522
00:25:36,850 --> 00:25:38,290
ALI: Oh yeah, fil-pront, perfetta.

523
00:25:38,290 --> 00:25:40,660
Allura aħna ser tip -

524
00:25:40,660 --> 00:25:41,670
liema do we tip?

525
00:25:41,670 --> 00:25:43,660
Kulħadd?

526
00:25:43,660 --> 00:25:46,480
Jew għandi biss tip dan?

527
00:25:46,480 --> 00:25:47,530
Are we attwalment jiġu ttajpjati l--

528
00:25:47,530 --> 00:25:48,430
ROB: Sure.

529
00:25:48,430 --> 00:25:50,990
ALI: Allura aħna ser tip ta 'printf fil-pront dan, hekk nistgħu nkunu

530
00:25:50,990 --> 00:25:54,810
simili, tagħti me a karattru.

531
00:25:54,810 --> 00:25:55,710
Okay, u imbagħad dak?

532
00:25:55,710 --> 00:25:56,664
Għaliex huwa tagħmel dan?

533
00:25:56,664 --> 00:25:57,620
ROB: I do not know.

534
00:25:57,620 --> 00:26:00,070
ALI: Okay.

535
00:26:00,070 --> 00:26:03,680
Allura issa, aħna qed tgħidilhom biex tagħtina karattru.

536
00:26:03,680 --> 00:26:07,064
Imma mbagħad kif taħseb fil-fatt tikseb dan il-karattru?

537
00:26:07,064 --> 00:26:10,060
SPEAKER 19: GetString Użu.

538
00:26:10,060 --> 00:26:12,040
ALI: GetString?

539
00:26:12,040 --> 00:26:12,850
GetChar?

540
00:26:12,850 --> 00:26:17,038
Okay, so x'hemm-differenza bejn string u char?

541
00:26:17,038 --> 00:26:20,020
SPEAKER 19: Strings huma serje, bħal firxa ta 'karattri.

542
00:26:20,020 --> 00:26:21,910
>> ALI: Kessaħ, yeah.

543
00:26:21,910 --> 00:26:25,550
Allura f'dan il-problema, aħna biss bżonn biex tikkunsidra karattru wieħed fi żmien, hekk

544
00:26:25,550 --> 00:26:28,400
aħna qed biss se jagħmlu GetChar għal din l-istanza.

545
00:26:28,400 --> 00:26:32,400
ROB: Aħna jista 'jimplimenta l-funzjoni jekk ridna li ħadet string kollu

546
00:26:32,400 --> 00:26:35,750
u marru fuq il-sekwenza u jinbidlu kollha zghar li uppercase u kollha

547
00:26:35,750 --> 00:26:37,380
uppercase zghar li.

548
00:26:37,380 --> 00:26:39,170
Iżda hawnhekk, aħna qed biss inti titlob għal wieħed karattru.

549
00:26:39,170 --> 00:26:42,800
ALI: Allura issa għandna l-karattru hawnhekk, iżda mbagħad għandna bżonn biex isalvawh.

550
00:26:42,800 --> 00:26:45,070
Mela allura aħna ser żid ċ char - liema?

551
00:26:45,070 --> 00:26:46,070
SPEAKER 20: Iddefinixxi l-varjabbli.

552
00:26:46,070 --> 00:26:48,100
ALI: Yeah, eżattament.

553
00:26:48,100 --> 00:26:49,585
Allura aħna għandna karattru tagħna.

554
00:26:49,585 --> 00:26:51,766
ROB: Naħseb li inti tista 'tkun -

555
00:26:51,766 --> 00:26:55,630
int biss tliet ispazji, li hija għaliex huwa yelling fi inti.

556
00:26:55,630 --> 00:27:01,300
>> ALI: Okay, berred, issa li għandna tabbing sett, x'jiġri jmiss?

557
00:27:01,300 --> 00:27:02,550
X'inhu l-pass li jmiss?

558
00:27:05,590 --> 00:27:08,870
ROB: Liema programm tagħna għandha tagħmel hu li jibdlu ittra zghar ghal

559
00:27:08,870 --> 00:27:10,130
uppercase ittra.

560
00:27:10,130 --> 00:27:15,478
X'jiġri jekk I jiġri li jidħlu fil-simbolu hash?

561
00:27:15,478 --> 00:27:16,314
Huwa li -

562
00:27:16,314 --> 00:27:16,732
ALI: Huwa simbolu tajjeb.

563
00:27:16,732 --> 00:27:18,270
Aħna nużaw dan ħafna.

564
00:27:18,270 --> 00:27:21,937
ROB: Hija li xi ħaġa validu nista jikkonvertu għall-formola uppercase?

565
00:27:21,937 --> 00:27:23,070
SPEAKER 21: No

566
00:27:23,070 --> 00:27:24,070
ALI: Le

567
00:27:24,070 --> 00:27:24,900
Għandna jivverifikaw li.

568
00:27:24,900 --> 00:27:34,950
Allura aħna jista 'jkollhom jekk id-dikjarazzjoni verifika hekk jekk il-c huwa akbar minn

569
00:27:34,950 --> 00:27:37,410
jew ugwali għal a'l zghar "-

570
00:27:37,410 --> 00:27:45,490
hekk jekk inħarsu lejn il-mappa, inti ser ikollok avviż li għandu jkun bejn hawnhekk,

571
00:27:45,490 --> 00:27:47,670
ta '97, u l-a zghar.

572
00:27:47,670 --> 00:27:52,110
U jista 'jkun kwalunkwe wieħed minn dawn, u f'inkrementi-triq kollha stabbiliti.

573
00:27:52,110 --> 00:27:55,200
U allura hemm z fi 122.

574
00:27:55,200 --> 00:27:58,215
U għandu jaqa 'bejn dawn iż-żewġ valuri.

575
00:27:58,215 --> 00:27:59,700
Does li jagħmel sens?

576
00:27:59,700 --> 00:28:04,130
ROB: Mela jekk c mhuwiex bejn 97 u 122 -

577
00:28:04,130 --> 00:28:09,960
jew qatt ma għandek bżonn tuża dawn in-numri - jekk c mhuwiex bejn "a" u

578
00:28:09,960 --> 00:28:15,110
"Z," allura ma kienx ta 'karattru valida għalina li uppercase.

579
00:28:15,110 --> 00:28:18,590
ALI: Allura fil-forma ta 'kodiċi, nistgħu ngħidu li jekk ċ hija akbar minn jew ugwali għal wieħed

580
00:28:18,590 --> 00:28:19,640
zghar każ -

581
00:28:19,640 --> 00:28:21,270
Ara naqra, kif ma inti tgħid li?

582
00:28:21,270 --> 00:28:26,900
Okay, huwa akbar minn jew ugwali għall-zghar "a", u għandu jkun 'il fuq

583
00:28:26,900 --> 00:28:32,250
"z". l-zghar Għalhekk għandu jkun inqas minn jew ugwali għal zghar "z".

584
00:28:32,250 --> 00:28:35,300
Aħna qed jagħmlu ċert li huwa bejn it-tnejn.

585
00:28:35,300 --> 00:28:38,540
Imbagħad nistgħu tkompli fuq il-kodiċi kuntenti tagħna.

586
00:28:41,992 --> 00:28:43,360
What?

587
00:28:43,360 --> 00:28:46,860
ROB: So I dehret aħna biss iżommu tistaqsi, jekk aħna jiġri li ma jkollhomx

588
00:28:46,860 --> 00:28:48,250
zghar ittra.

589
00:28:48,250 --> 00:28:51,130
ALI: Oh, I ma kienx konxju ta 'dan.

590
00:28:51,130 --> 00:28:52,820
Jiddispjacini.

591
00:28:52,820 --> 00:28:58,100
>> Okay, hekk jekk aħna qed tmur biex jagħmlu bħala Rob jgħid, u kun żgur li -

592
00:28:58,100 --> 00:29:02,068
aħna nkunu nistgħu nżommu talbithom, allura dak li għandu nagħmlu?

593
00:29:02,068 --> 00:29:02,994
SPEAKER 22: [inaudible]

594
00:29:02,994 --> 00:29:03,530
ROB: Yeah.

595
00:29:03,530 --> 00:29:05,630
Għandna nużaw xi tip ta 'linja.

596
00:29:05,630 --> 00:29:12,900
Minħabba li l-utent jista 'jidħol xi ħaġa invalidu ammont untold ta' drabi.

597
00:29:12,900 --> 00:29:14,990
Allura inti tista 'tuża loop waqt.

598
00:29:14,990 --> 00:29:18,870
L-iskop ta 'linja do-waqt -

599
00:29:18,870 --> 00:29:21,340
litteralment, il-ħin biss fil-ħajja tiegħek kollu inti qatt tuża do-

600
00:29:21,340 --> 00:29:24,780
filwaqt loops huwa meta inti qed titlob għall-input utent.

601
00:29:24,780 --> 00:29:28,260
Allura l-fatt aħna qed titlob għall-input utent hawnhekk huwa ħjiel li għandna

602
00:29:28,260 --> 00:29:29,660
tuża loop do-waqt.

603
00:29:29,660 --> 00:29:30,780
U għaliex huwa li?

604
00:29:30,780 --> 00:29:34,270
Minħabba do-waqt li loop dejjem jiġri mill-inqas darba.

605
00:29:34,270 --> 00:29:40,260
Allura meta inti qed titlob għall-input utent, inti tixtieq biex dan iseħħ għall-inqas darba.

606
00:29:40,260 --> 00:29:42,750
U mbagħad jekk l-affarijiet kienu ta 'suċċess, inti tista' żżomm għaddej.

607
00:29:42,750 --> 00:29:45,130
Jekk le, mur lura u tagħmel talba oħra.

608
00:29:45,130 --> 00:29:48,950
>> ALI: Allura fi kliem ieħor, għandna nagħmlu taqsima.

609
00:29:48,950 --> 00:29:51,130
U hekk dan huwa javżak li tagħmel xi ħaġa.

610
00:29:51,130 --> 00:29:53,890
Allura printf -

611
00:29:53,890 --> 00:29:57,490
jistampaw id-dikjarazzjoni, il-pront, u wkoll tikseb l-karattru, jew jippruvaw

612
00:29:57,490 --> 00:29:58,780
tikseb karattru.

613
00:29:58,780 --> 00:30:03,410
U allura għandna biex jiċċekkjaw jekk hija effettivament għamlet b'mod korrett.

614
00:30:03,410 --> 00:30:07,730
Mela allura aħna żid il-kundizzjonijiet, allura nistgħu ngħidu waqt, u allura aħna għandna l-

615
00:30:07,730 --> 00:30:08,980
kondizzjonali dikjarazzjoni.

616
00:30:11,600 --> 00:30:14,730
ROB: Imma issa għandna maqluba l-ferrovija tal-ħsieb.

617
00:30:14,730 --> 00:30:18,940
Issa aħna oriġinarjament kienu jgħidu jekk ċ hija din il-firxa, huwa validu.

618
00:30:18,940 --> 00:30:23,340
Issa rridu biex ireġġgħu lura din u jgħidu jekk ċ mhix f'din il-firxa, allura aħna

619
00:30:23,340 --> 00:30:25,020
bżonn back biex tagħmel affarijiet mill-ġdid.

620
00:30:25,020 --> 00:30:25,900
ALI: Oh, yeah.

621
00:30:25,900 --> 00:30:31,720
ROB: Għalhekk, filwaqt li dan mhux veru, irridu imorru lura u

622
00:30:31,720 --> 00:30:34,470
jitlob għall-ieħor karattru.

623
00:30:34,470 --> 00:30:36,880
Does kulħadd tara li?

624
00:30:36,880 --> 00:30:38,830
Mistoqsijiet dwar dan?

625
00:30:38,830 --> 00:30:39,400
Okay.

626
00:30:39,400 --> 00:30:43,480
>> Allura issa għandna karattru valida li nistgħu kbar.

627
00:30:43,480 --> 00:30:47,150
ALI: Mela allura dak l-pass li jmiss għall uppercasing dan?

628
00:30:49,994 --> 00:30:51,890
SPEAKER 23: Żid 32.

629
00:30:51,890 --> 00:30:52,600
ALI: Inti żid -

630
00:30:52,600 --> 00:30:54,150
sorry, liema?

631
00:30:54,150 --> 00:30:56,580
SPEAKER 23: Ma tistax inti biss żid 32?

632
00:30:56,580 --> 00:31:02,360
ROB: Allura iva, mhux f'termini ta 'numri magic.

633
00:31:02,360 --> 00:31:04,610
Għandek biss tkun qed tuża wieħed kwotazzjoni għalf.

634
00:31:04,610 --> 00:31:06,450
SPEAKER 23: Okay, ukoll -

635
00:31:06,450 --> 00:31:07,250
Rob: Iżda int tista 'tieħu 32 -

636
00:31:07,250 --> 00:31:11,870
ALI: Kif sirt tikseb l-numru 32, I raden, huwa dak li aħna qed tgħid.

637
00:31:11,870 --> 00:31:18,060
SPEAKER 23: [inaudible]

638
00:31:18,060 --> 00:31:22,158
ROB: Allura nistgħu toħroġ il-numru 32 flimkien -

639
00:31:22,158 --> 00:31:24,468
SPEAKER 23: [inaudible]?

640
00:31:24,468 --> 00:31:24,930
ROB: Yeah.

641
00:31:24,930 --> 00:31:28,540
Imma jekk aħna qed tmur biex tagħmel dan fil-passi 2 għamilna qabel ma

642
00:31:28,540 --> 00:31:29,950
l-għalf pożizzjoni.

643
00:31:29,950 --> 00:31:36,910
Allura l-pożizzjoni fl-alfabett li ċ jiġri li jkun huwa ċ nieqes zghar

644
00:31:36,910 --> 00:31:42,360
"A". Allura jekk aħna daħlu lowercase "d", il-pożizzjoni se tkun 3.

645
00:31:42,360 --> 00:31:46,490
U issa irridu li jieħdu l-affarijiet għall-firxa uppercase ta 'affarijiet.

646
00:31:46,490 --> 00:31:55,376
Allura issa ċ-ġdida tagħna se tkun il-kapital "A" pożizzjoni plus.

647
00:31:55,376 --> 00:32:00,090
Allura do nies tara kif dan iwassalna -

648
00:32:00,090 --> 00:32:04,140
aħna qed jiċċaqalqu mill-firxa zghar, il-fond eżatt konna f'dak

649
00:32:04,140 --> 00:32:07,650
firxa, u jmorru l isfel fil-medda uppercase, u jmorru li s'issa

650
00:32:07,650 --> 00:32:10,610
fis-ġdid, li se tkun l-istess natura, iżda issa

651
00:32:10,610 --> 00:32:12,550
uppercased.

652
00:32:12,550 --> 00:32:16,490
ALI: U għall-persuni li kienu konfużi minn kif hu biss qal 32,

653
00:32:16,490 --> 00:32:20,390
bażikament huwa kkombinat dawn iż-żewġ f'waħda dikjarazzjoni.

654
00:32:20,390 --> 00:32:24,550
Allura b'mod ekwivalenti ta 'kitba din li jgħidu inti tista' biss tip ta '

655
00:32:24,550 --> 00:32:28,190
pożizzjoni sostitut, il-c nieqes "a," u poġġih dritt hawn.

656
00:32:28,190 --> 00:32:31,330
Allura dak li kien, I don 't -

657
00:32:31,330 --> 00:32:44,510
char newc = uppercase "A" plus minus ċ zghar "a". U minħabba l-alġebra,

658
00:32:44,510 --> 00:32:47,090
inti tista 'timxi minnhom madwar.

659
00:32:47,090 --> 00:32:52,960
Tista 'wkoll tgħid li inti tista' timxi madwar sabiex char newc = uppercase "A"

660
00:32:52,960 --> 00:32:55,620
nieqes zghar "a" c plus.

661
00:32:55,620 --> 00:32:58,650
U dan, inti ser ikollok avviż jekk immorru lura għall-chart.

662
00:33:01,160 --> 00:33:06,300
Għandna uppercase A huwa 65 u zghar a huwa 97.

663
00:33:06,300 --> 00:33:09,800
Allura 65-97 huwa -32.

664
00:33:09,800 --> 00:33:10,020
>> Hi.

665
00:33:10,020 --> 00:33:10,930
Ħu sedil.

666
00:33:10,930 --> 00:33:12,180
Oh.

667
00:33:16,240 --> 00:33:17,980
Tista 'tiltaqa dritt hawn.

668
00:33:17,980 --> 00:33:20,805
Kessaħ, okay, biża '.

669
00:33:20,805 --> 00:33:22,390
Merħba għas-sezzjoni.

670
00:33:22,390 --> 00:33:25,110
Int ser ikollok avviż li d-differenza hija ta '32.

671
00:33:25,110 --> 00:33:28,150
Allura dak fejn hu ltqajna dak in-numru.

672
00:33:28,150 --> 00:33:32,140
Imma din mhix, bħala Rob jgħid, l-aħjar mod biex tagħmel dan, minħabba li għandu l-stramb

673
00:33:32,140 --> 00:33:35,260
konfużjoni magic numru.

674
00:33:35,260 --> 00:33:38,710
ROB: Għandek tuża kapital A minus zghar a.

675
00:33:38,710 --> 00:33:43,045
Inti m'għandekx tuża biss straight 32.

676
00:33:43,045 --> 00:33:45,020
SPEAKER 24: Għaliex hija li, għal darb'oħra?

677
00:33:45,020 --> 00:33:49,860
Għaliex għandek ma jużawx 32?

678
00:33:49,860 --> 00:33:55,630
ALI: Jekk aħna ma dan, ikun char newc = -32 + c.

679
00:33:55,630 --> 00:34:00,030
U jekk inti ma tara l-ebda mill-bqija ta 'dan, jekk din hija kollha marret, u int

680
00:34:00,030 --> 00:34:04,720
biss tara din il-linja waħda, allura kif tkun taf x'inhi l-32 negattiv huwa?

681
00:34:04,720 --> 00:34:07,000
Huwa biss barra mill-post.

682
00:34:07,000 --> 00:34:10,360
ROB: Allura program tiegħek tkun taħdem kompletament multa.

683
00:34:10,360 --> 00:34:12,960
Huwa biss ħaġa stil.

684
00:34:12,960 --> 00:34:17,760
Xi ħadd li jmorru fi u qari kodiċi tiegħek, dawn qed bħal dak ma 32 jfisser?

685
00:34:17,760 --> 00:34:18,889
Forsi dawn don 't -

686
00:34:18,889 --> 00:34:22,090
I probabbilment mhux se immedjatament tirrealizza li 32 jiġri li jkun

687
00:34:22,090 --> 00:34:25,100
differenza bejn ittra zghar u ittra uppercase, għalkemm

688
00:34:25,100 --> 00:34:26,510
aħna qed tmur għall-użu dan il-fatt fil-problema li jmiss.

689
00:34:30,210 --> 00:34:31,610
32 hija -

690
00:34:31,610 --> 00:34:38,579
inti tista 'tħalli kumment hawn fuq tgħid 32 hija d-differenza bejn

691
00:34:38,579 --> 00:34:45,290
"A" u "a". Iżda f'dak il-punt, għaliex mhux biss użu "A" u "a", u inti

692
00:34:45,290 --> 00:34:47,469
m'għandhomx bżonn l-kumment imbagħad.

693
00:34:47,469 --> 00:34:52,739
>> ALI: Huwa biss l-modi ta 'hawn fuq huma nodfa ħafna, stil għaqli.

694
00:34:52,739 --> 00:34:54,590
U għalhekk, peress li int biss jibdew programmar -

695
00:34:54,590 --> 00:34:57,775
jew I raden le, peress li int EDI Hacker - qatt f'moħħhom.

696
00:34:57,775 --> 00:34:59,420
Huwa biss mod tajjeb li jkollha -

697
00:34:59,420 --> 00:35:01,230
huwa aħjar li jkollhom stil aħjar.

698
00:35:01,230 --> 00:35:02,850
Huwa aktar faċli għal nies oħra biex jinqara.

699
00:35:02,850 --> 00:35:06,560
ROB: Qatt ma għandek bżonn li wieħed jiftakar il-mejda ASCII, qatt.

700
00:35:06,560 --> 00:35:09,505
Inti għandek biss tkun tista 'tuża l-karattri kwotazzjoni wieħed.

701
00:35:12,390 --> 00:35:12,730
Mistoqsijiet?

702
00:35:12,730 --> 00:35:13,980
ALI: Kulhadd tajba?

703
00:35:16,020 --> 00:35:16,430
ROB: Okay.

704
00:35:16,430 --> 00:35:23,320
Allura l-problema li jmiss huwa sostanzjali.

705
00:35:23,320 --> 00:35:24,660
Allura l-problema li jmiss jitlob magħna -

706
00:35:27,880 --> 00:35:31,570
ALI: Il-problema li jmiss qed titlob għalina biex jagħmlu l-istess ħaġa, iżda l-użu

707
00:35:31,570 --> 00:35:32,640
bitwise operaturi.

708
00:35:32,640 --> 00:35:35,170
ROB: U ovvjament, ma rajniex operaturi bitwise s'issa.

709
00:35:35,170 --> 00:35:38,874
Allura aħna ser jiddiskutu dawk issa.

710
00:35:38,874 --> 00:35:39,540
ALI: Be eċċitati.

711
00:35:39,540 --> 00:35:41,490
Huma qed gost super.

712
00:35:41,490 --> 00:35:47,927
>> ROB: Allura l-operaturi regolari, bħall x plus y, minus, darbiet, qasma.

713
00:35:47,927 --> 00:35:50,850
ALI: Tip li f'dan pront.

714
00:35:50,850 --> 00:35:55,420
Rob: Hemm ukoll%, jekk inti ma bbenefikawx dan, li inti tista 'użu mill-

715
00:35:55,420 --> 00:35:57,130
mija simbolu.

716
00:35:57,130 --> 00:35:59,090
Imma aħna mhux se jużaw dawk għal din il-problema.

717
00:35:59,090 --> 00:36:01,400
Aħna rridu li jużaw operaturi bitwise.

718
00:36:01,400 --> 00:36:06,250
Issa ftakar, aħna miġjuba it up fil lecture wieħed.

719
00:36:06,250 --> 00:36:10,760
M'inix ċert jekk aħna ve diskussi binarju lil hinn minnha.

720
00:36:10,760 --> 00:36:13,710
Imma ftakar li kull numru uniku huwa rappreżentat -

721
00:36:13,710 --> 00:36:14,540
sew, kollox -

722
00:36:14,540 --> 00:36:17,860
huwa rappreżentat fil 1s u 0s fil-binarju.

723
00:36:17,860 --> 00:36:27,320
Allura dan ifisser li meta ngħid n-numru 8, I jiġri li tkun taf li dan huwa

724
00:36:27,320 --> 00:36:30,240
simili, 1000.

725
00:36:30,240 --> 00:36:35,530
Liema operaturi bitwise jgħidilna tagħmel huwa jopera fuq dawn bits -

726
00:36:35,530 --> 00:36:37,000
huwa jopera fuq dawn bits direttament.

727
00:36:40,160 --> 00:36:42,490
Issa jien m'għadhomx jittrattaw f'termini ta 'tmienja.

728
00:36:42,490 --> 00:36:45,930
Jien jittrattaw f'termini ta '1000, u nixtieq li tagħmel affarijiet ma' dawk

729
00:36:45,930 --> 00:36:47,670
bits individwali.

730
00:36:47,670 --> 00:36:52,520
Allura Ali kitbet lill-operaturi bitwise hawn, iżda that's -

731
00:36:55,060 --> 00:36:58,020
In-numru 8 aħna ser tuża bħala waħda ta 'numri eżempju tagħna.

732
00:36:58,020 --> 00:37:02,980
U l-rappreżentazzjoni binarja huwa 1000.

733
00:37:02,980 --> 00:37:06,520
Aħna ser tuża numru ieħor, 5 -

734
00:37:06,520 --> 00:37:12,070
attwalment ejja jużaw 9 u 5.

735
00:37:12,070 --> 00:37:15,778
U rappreżentazzjoni binarja ta '5 huwa 00 -

736
00:37:15,778 --> 00:37:18,380
0101.

737
00:37:18,380 --> 00:37:19,480
ALI: Huwa kulħadd tajba fuq dan?

738
00:37:19,480 --> 00:37:21,040
Il-binarju Jittieħed?

739
00:37:21,040 --> 00:37:23,740
Kien mill-ewwel lecture?

740
00:37:23,740 --> 00:37:29,070
>> ROB: Għalhekk anki jekk m'intix kompletament fuq quċċata ta 'kif jistgħu jikkonvertu affarijiet li

741
00:37:29,070 --> 00:37:31,700
binarju, li mhux kompletament importanti għal din il-problema.

742
00:37:31,700 --> 00:37:36,560
Aħna ser tkun qed tuża, iżda inti ser ikollhom iċ-ċansijiet ħafna aktar biex insemmu kif

743
00:37:36,560 --> 00:37:39,250
malajr dawran affarijiet fil binarja.

744
00:37:39,250 --> 00:37:43,820
Allura jużaw 9 u 5, issa għandna l-operaturi bitwise tagħna.

745
00:37:43,820 --> 00:37:48,620
Oh, u wkoll, 9 u 5, jekk huwa integer, allura verament huwa 32 bits,

746
00:37:48,620 --> 00:37:53,150
li jfisser li għandna bħall 0, 0, 0, 0 ħafna drabi, imbagħad

747
00:37:53,150 --> 00:37:55,330
101 fuq l-aħħar ħafna.

748
00:37:55,330 --> 00:37:58,530
Dak biss għaliex, l-ebda kwistjoni dak li inti tagħmel, fil-interi, 32 bits.

749
00:37:58,530 --> 00:38:01,570
Sempliċiment għax aħna biss bżonn 4 bits li jirrappreżentaw 9 ma jfissirx li aħna mhux qed

750
00:38:01,570 --> 00:38:05,500
jintużaw il-oħra 27 bits għal ftit 0s.

751
00:38:05,500 --> 00:38:10,110
ALI: Just biex tiċċara, waħda minn dawn in-numri li dawn, ta '0 jew 1 huwa daqsxejn.

752
00:38:10,110 --> 00:38:11,830
Dan huwa wieħed 4 bits.

753
00:38:11,830 --> 00:38:14,320
Kif sabiex Rob qal li l-magni jaħżinhom 32.

754
00:38:14,320 --> 00:38:19,430
Allura mbagħad dawn ikollhom 32 jew ta '0 jew b 1.

755
00:38:19,430 --> 00:38:22,190
Kessaħ?

756
00:38:22,190 --> 00:38:23,610
ROB: L-operaturi bitwise.

757
00:38:23,610 --> 00:38:27,310
L-ewwel waħda li aħna ser jittrattaw, ejja do &.

758
00:38:27,310 --> 00:38:31,260
Mela jekk nagħmlu 9 & 5.

759
00:38:31,260 --> 00:38:38,310
Allura dak li ma huwa &, ftit ftit, hija tqabbel il-bits ta 'l-żewġ numri

760
00:38:38,310 --> 00:38:44,860
u jekk iż-żewġ numri huma 1, allura huwa ser jerġa '1.

761
00:38:44,860 --> 00:38:50,870
Jekk waħda hija ta '0 u l-ieħor huwa ta' 1, jew it-tnejn huma 0s, allura jirritorna 0.

762
00:38:50,870 --> 00:38:53,060
Allura inti tista 'taħseb bħala riservi loġiku tiegħek.

763
00:38:53,060 --> 00:38:59,270
Bħal għandek bżonn veru u vera li jirritornaw vera, imma vera u falza hija falza.

764
00:38:59,270 --> 00:39:02,390
Allura huwa l-istess ħaġa, iżda issa aħna qed jittrattaw ma 'biss bits.

765
00:39:02,390 --> 00:39:04,910
>> ALI: Mela jekk inti tħares lejn din, inti ser ikollok 1 -

766
00:39:04,910 --> 00:39:08,490
inti ser linja lilhom, u għalhekk ser tkun l-1 u 0.

767
00:39:08,490 --> 00:39:11,036
Do you guys jaħsbu li se jkun - dak li kieku jevalwa għall?

768
00:39:11,036 --> 00:39:11,770
SPEAKER 25: 1.

769
00:39:11,770 --> 00:39:12,270
ALI:. Kessaħ

770
00:39:12,270 --> 00:39:16,850
Jew l-ebda.

771
00:39:16,850 --> 00:39:18,830
Jiddispjacini.

772
00:39:18,830 --> 00:39:21,290
Allura ma li jagħmel sens?

773
00:39:21,290 --> 00:39:23,200
Allura x'inhi l-risposta kollettiva mill-ġdid?

774
00:39:23,200 --> 00:39:24,750
Jiddispjacini.

775
00:39:24,750 --> 00:39:27,530
Mela jekk ikollna 1 u 0, allura dak do you get?

776
00:39:27,530 --> 00:39:30,260
ROB: Allura inti taħseb kif inti tgħid u out loud.

777
00:39:30,260 --> 00:39:37,550
Jekk għandek żewġ bits, xuy, inti għandek bżonn x uy li jkun 1 sabiex din

778
00:39:37,550 --> 00:39:40,770
biex tevalwa l-vera - jew, biex ikun jista 'jevalwa l-1.

779
00:39:40,770 --> 00:39:45,650
Jekk x jew y huma 0, allura jevalwa l falza jew 0.

780
00:39:45,650 --> 00:39:49,165
LUCAS: Huwa tajjeb li niftakru wkoll li 1 huwa veru u 0 hija falza.

781
00:39:49,165 --> 00:39:51,684
Mela jekk għandek veru & falza, huwa falz.

782
00:39:51,684 --> 00:39:53,570
Iżda mbagħad, vera u vera, vera.

783
00:39:53,570 --> 00:39:55,040
Foloz & falza, falza.

784
00:39:55,040 --> 00:39:57,650
ALI: Aħna vera & falza.

785
00:39:57,650 --> 00:39:58,530
Allura 1 u 0.

786
00:39:58,530 --> 00:40:00,380
Allura mbagħad, sorry, wieħed aktar ħin?

787
00:40:00,380 --> 00:40:02,210
SPEAKER 25: Ikun 0.

788
00:40:02,210 --> 00:40:03,560
Yeah, berred.

789
00:40:03,560 --> 00:40:05,400
U allura aħna għandna 0 & 1 -

790
00:40:05,400 --> 00:40:06,260
SPEAKER 25: [inaudible]

791
00:40:06,260 --> 00:40:06,680
ALI: Yeah.

792
00:40:06,680 --> 00:40:09,790
Allura inti tista 'dejjem tpartit fil -

793
00:40:09,790 --> 00:40:12,150
Imbagħad jekk għandek 0 u 0?

794
00:40:12,150 --> 00:40:12,618
SPEAKER 4: 1?

795
00:40:12,618 --> 00:40:14,490
0?

796
00:40:14,490 --> 00:40:16,230
ROB: Allura huwa 0.

797
00:40:16,230 --> 00:40:18,870
Mhuwiex li ż-żewġ numri għandhom ikunu l-istess.

798
00:40:18,870 --> 00:40:22,030
Huwa dak iż-numri jeħtieġ li tkun 1.

799
00:40:22,030 --> 00:40:26,150
ALI: Allura kemm għandek tkun vera biex din tkun veru.

800
00:40:26,150 --> 00:40:26,950
Allura dak 0.

801
00:40:26,950 --> 00:40:30,540
U allura inti għandek 1% 1, li hija?

802
00:40:30,540 --> 00:40:32,640
ROB: Dawn huma numri pretty tajba.

803
00:40:32,640 --> 00:40:34,362
Huma kollha possibbli -

804
00:40:34,362 --> 00:40:36,210
ALI: xogħol tajjeb, wow.

805
00:40:36,210 --> 00:40:37,080
Okay, berred.

806
00:40:37,080 --> 00:40:39,220
Allura ma li jagħmel sens għal kulħadd?

807
00:40:39,220 --> 00:40:41,770
>> ROB: Allura issa aħna ser nagħmlu |.

808
00:40:41,770 --> 00:40:51,650
U dan se jkun simili ħafna, iżda issa minflok ta 'xuy jeħtieġu li

809
00:40:51,650 --> 00:40:54,880
jkun 1 sabiex din tevalwa l-waħda, issa huwa biss x jew

810
00:40:54,880 --> 00:40:56,360
y jeħtieġ li tkun 1.

811
00:40:56,360 --> 00:40:59,580
ALI: Allura 1 | 0 jevalwa l -

812
00:40:59,580 --> 00:41:00,270
KLASSI: 1.

813
00:41:00,270 --> 00:41:01,690
ALI:. Kessaħ

814
00:41:01,690 --> 00:41:03,710
0 | 1 jevalwa l -

815
00:41:03,710 --> 00:41:04,420
KLASSI: 1.

816
00:41:04,420 --> 00:41:06,726
ALI: Kessaħ, u mbagħad 0 | 0 -

817
00:41:06,726 --> 00:41:07,600
KLASSI: 0.

818
00:41:07,600 --> 00:41:09,320
ALI: Yeah, u mbagħad 1 | 1 -

819
00:41:09,320 --> 00:41:10,180
KLASSI: 1.

820
00:41:10,180 --> 00:41:12,090
ALI:. Kessaħ

821
00:41:12,090 --> 00:41:14,060
Allura dak simili operaturi bitwise 2.

822
00:41:14,060 --> 00:41:15,430
Tal-biża '.

823
00:41:15,430 --> 00:41:16,440
ROB: Allura issa aħna ser nagħmlu ^.

824
00:41:16,440 --> 00:41:18,470
ALI: Jekk nagħmlu kull wieħed minnhom?

825
00:41:18,470 --> 00:41:20,620
ROB: Yeah, għaliex naħseb aħna qed tmur biex tużah -

826
00:41:20,620 --> 00:41:22,340
jużawhom kollha.

827
00:41:22,340 --> 00:41:23,150
ALI: Okay.

828
00:41:23,150 --> 00:41:23,570
Allura -

829
00:41:23,570 --> 00:41:25,540
ROB: I raden aħna ma bżonn li.

830
00:41:25,540 --> 00:41:31,830
ALI: Allura ^ xogħlijiet li inti trid li jkollha eżattament waħda vera u waħda falza.

831
00:41:31,830 --> 00:41:34,330
^ Ifisser esklussiv JEW.

832
00:41:34,330 --> 00:41:36,650
Allura issa mhuwiex -

833
00:41:36,650 --> 00:41:41,220
jekk xuy huma t-tnejn 1, huwa issa falza.

834
00:41:41,220 --> 00:41:46,920
Dan huwa d-differenza bejn ^ u |, hija li OR, inti jista 'jkollhom, jekk x huwa

835
00:41:46,920 --> 00:41:49,440
veru jew y huwa minnu, allura aħna qed tajba.

836
00:41:49,440 --> 00:41:55,176
Le, ^ jgħid jekk x huwa veru, y għandu jkun falz, jew inkella mhuwiex veru.

837
00:41:55,176 --> 00:41:56,814
Għandek xi mistoqsija?

838
00:41:56,814 --> 00:42:00,526
>> SPEAKER 26: [inaudible]

839
00:42:00,526 --> 00:42:00,990
ALI: Yeah.

840
00:42:00,990 --> 00:42:01,830
Huwa tip ta 'simili.

841
00:42:01,830 --> 00:42:07,320
ROB: Yeah, hekk meta ikollok li Jittieħed hardware ta 'livell baxx, dawn huma

842
00:42:07,320 --> 00:42:10,870
it-tipi ta 'operazzjonijiet int jittrattaw.

843
00:42:10,870 --> 00:42:13,200
Fil-livell hardware, inti jittrattaw biss bits.

844
00:42:13,200 --> 00:42:14,950
Inti ma jittrattawx numri.

845
00:42:18,030 --> 00:42:23,502
ALI: Okay, għal ^, jew jekk għandek 1 ^ 0, liema għandu jevalwa dak li?

846
00:42:23,502 --> 00:42:24,840
KLASSI: 1.

847
00:42:24,840 --> 00:42:25,480
ALI:. Kessaħ

848
00:42:25,480 --> 00:42:26,010
Jekk għandek

849
00:42:26,010 --> 00:42:28,370
0 ^ 1? KLASSI: 1.

850
00:42:28,370 --> 00:42:29,490
ALI:. Kessaħ

851
00:42:29,490 --> 00:42:32,050
0 ^ 0?

852
00:42:32,050 --> 00:42:32,470
Kessaħ.

853
00:42:32,470 --> 00:42:33,460
U mbagħad 1 ^ 1?

854
00:42:33,460 --> 00:42:35,050
KLASSI: 0.

855
00:42:35,050 --> 00:42:37,710
ALI: Kessaħ, biża '.

856
00:42:37,710 --> 00:42:38,620
Il-wieħed li jmiss -

857
00:42:38,620 --> 00:42:40,520
ROB: Naħseb li dawn huma kollha għandna biex jittrattaw.

858
00:42:40,520 --> 00:42:41,490
Aħna ser biss tagħmel dawn.

859
00:42:41,490 --> 00:42:43,242
ALI: Il-ħin biss aħna ser ikollhom jagħmlu -

860
00:42:43,242 --> 00:42:44,912
ROB: Oh, li se jkun għall-problema aħħar.

861
00:42:44,912 --> 00:42:47,070
SPEAKER 27: Stenna, għal darb'oħra?

862
00:42:47,070 --> 00:42:47,940
ALI: Jiddispjacini, dak li kien il-mistoqsija tiegħek?

863
00:42:47,940 --> 00:42:49,564
>> SPEAKER 27: Tista 'tispjega li għal darb'oħra?

864
00:42:49,564 --> 00:42:50,100
Il ^?

865
00:42:50,100 --> 00:42:51,490
SPEAKER 27: Exclus - yeah.

866
00:42:51,490 --> 00:42:55,800
ALI: Allura x'inhi l-hija esklussiva OR ifisser li għandu jkun hemm esklussivament

867
00:42:55,800 --> 00:43:02,970
1 falza vera u wieħed, għalhekk wieħed 1 u 1 0, kontra l OR, inti jista 'jkollhom -

868
00:43:02,970 --> 00:43:06,170
wieħed minnhom għandu jkun veru, jew it-tnejn minnhom jista 'jkun minnu, għal dan

869
00:43:06,170 --> 00:43:07,130
biex tevalwa l-vera.

870
00:43:07,130 --> 00:43:10,030
SPEAKER 27: So 0 u 0 jkun falz.

871
00:43:10,030 --> 00:43:10,450
ALI: Yeah.

872
00:43:10,450 --> 00:43:11,780
Imma jekk għandek 1 |

873
00:43:11,780 --> 00:43:14,290
1, li jevalwa sa veru.

874
00:43:14,290 --> 00:43:18,210
Imma jekk għandek 1 ^ 1, kif għamilna, li jevalwa sa falza.

875
00:43:18,210 --> 00:43:21,220
Għaliex mhuwiex esklussivament waħda hija vera.

876
00:43:21,220 --> 00:43:26,930
ROB: U dan jista 'jew ma jista' jkun utli, iżda avviż li l-^ tkun

877
00:43:26,930 --> 00:43:28,890
daqs biss tieħu l |

878
00:43:28,890 --> 00:43:30,290
nieqes il-&.

879
00:43:30,290 --> 00:43:32,250
U inti tista 'attwalment jaħsbu li dan il-mod.

880
00:43:32,250 --> 00:43:37,290
^ Huwa biss oring kollox flimkien iżda li tieħu twettaq kwalunkwe mill-bits fejn

881
00:43:37,290 --> 00:43:38,610
tnejn kienu vera.

882
00:43:38,610 --> 00:43:41,620
Allura & prospetti kollox fejn it-tnejn kienu vera.

883
00:43:41,620 --> 00:43:45,850
| Jirritorna kollox fejn waħda jew tnejn kienu vera.

884
00:43:45,850 --> 00:43:51,050
Allura tnaqqas l barra mill-| jagħtik l-^.

885
00:43:51,050 --> 00:43:52,040
ALI: Kwalunkwe mistoqsijiet?

886
00:43:52,040 --> 00:43:53,290
Dan kien ħafna ta 'informazzjoni.

887
00:43:55,980 --> 00:43:57,510
Tajba Kulħadd?

888
00:43:57,510 --> 00:44:00,360
>> ROB: Aħna tista 'tmur fuq dawk li jmiss għall-problema li jmiss, mmejla

889
00:44:00,360 --> 00:44:01,680
dak iż-żmien huwa?

890
00:44:01,680 --> 00:44:04,010
Huma m'għandhomx bżonn dan sakemm il-problema li jmiss.

891
00:44:04,010 --> 00:44:07,830
ALI: Ħsibt li kien dan wieħed.

892
00:44:07,830 --> 00:44:08,830
ROB: Mhuwiex.

893
00:44:08,830 --> 00:44:10,085
ALI: Inti żgur?

894
00:44:10,085 --> 00:44:11,300
ROB: Iva, jien pożittiv.

895
00:44:11,300 --> 00:44:12,970
ALI: Għaliex ma nibdew nagħmlu l-problema li jmiss?

896
00:44:15,710 --> 00:44:19,790
Il-problema hija, għal darb'oħra, biex jibdlu minn zghar li uppercase, u dan

897
00:44:19,790 --> 00:44:21,720
ħin biex jużaw l-operaturi bitwise.

898
00:44:21,720 --> 00:44:22,970
ROB: Allura aħna se -

899
00:44:25,290 --> 00:44:29,670
Nibdew bl-rappreżentazzjoni binarja ta '"A", il-kapital "A",

900
00:44:29,670 --> 00:44:31,750
li huwa 65.

901
00:44:31,750 --> 00:44:36,150
Għalhekk fl binarja -

902
00:44:39,960 --> 00:44:47,900
hekk "A" = 65, li =, fil binarja -

903
00:44:47,900 --> 00:44:51,380
Jien ser mess up in-numru ta 0s - li.

904
00:44:51,380 --> 00:44:53,670
ALI: Allura dan jagħmel sens għal kulħadd?

905
00:44:53,670 --> 00:44:57,620
Allura, 1, l-ebda 2s, l-ebda 4s, l-ebda 8S, l-ebda -

906
00:45:00,238 --> 00:45:07,075
ebda 16s, l-ebda 32S, u mbagħad 1 64.

907
00:45:07,075 --> 00:45:08,685
ROB: Yeah, naħseb li 1 0s wisq.

908
00:45:08,685 --> 00:45:09,600
ALI: Jiddispjacini.

909
00:45:09,600 --> 00:45:13,410
>> ROB: Okay, hekk aħna l-sett 64, u għandna l-sett 1, u tgħaqqad dawk

910
00:45:13,410 --> 00:45:16,030
flimkien, irridu jiksbu 65.

911
00:45:16,030 --> 00:45:17,470
ALI: fażola Kessaħ?

912
00:45:17,470 --> 00:45:19,640
ROB: Allura issa, zghar "a'-

913
00:45:22,220 --> 00:45:24,260
Avviż 97 -

914
00:45:24,260 --> 00:45:26,370
dak li huwa d-differenza bejn 97 u 65?

915
00:45:26,370 --> 00:45:27,530
SPEAKER 28: 32.

916
00:45:27,530 --> 00:45:28,130
ROB: Yeah.

917
00:45:28,130 --> 00:45:35,920
Allura huwa 32, li huwa daqsxejn tagħha stess, b'tali mod li għaddej biex tkun 110001.

918
00:45:35,920 --> 00:45:41,200
U dan se jkun veru għall-karattri kollha possibbli.

919
00:45:41,200 --> 00:45:49,800
Allura jekk naħsbu ta '"D", li se tkun 68, li għaddej biex tkun 1000011.

920
00:45:49,800 --> 00:45:56,310
U allura zghar "d" huwa se jkun 68 flimkien ma '32, li huwa 100, li huwa

921
00:45:56,310 --> 00:46:00,010
se tkun l-istess ħaġa li dan kien, biss flipping-

922
00:46:00,010 --> 00:46:04,300
32 mill-ġdid, hekk 1100011.

923
00:46:04,300 --> 00:46:08,610
Allura l-differenza bejn l-ittra uppercase u zghar huwa biss flipping

924
00:46:08,610 --> 00:46:10,170
li 32-bit pożizzjoni.

925
00:46:10,170 --> 00:46:17,670
SPEAKER 29: Hux 1000100?

926
00:46:17,670 --> 00:46:19,670
ROB: Stenna, huwa 100 -

927
00:46:19,670 --> 00:46:20,480
xi ħaġa li għamilt ħażin.

928
00:46:20,480 --> 00:46:21,730
Dan ma kienx veru.

929
00:46:28,710 --> 00:46:31,150
I kienet taħseb li kien hemm differenza ta '3, hekk allura I biss staġnati

930
00:46:31,150 --> 00:46:33,970
il-binarju 3 fl-aħħar.

931
00:46:33,970 --> 00:46:36,710
Dan għandu jkun id-dritt.

932
00:46:36,710 --> 00:46:37,150
ALI: Grazzi.

933
00:46:37,150 --> 00:46:38,080
Tajba għall tipponta dik out.

934
00:46:38,080 --> 00:46:40,320
Dan kien qawwija.

935
00:46:40,320 --> 00:46:43,450
Kull dritt, huwa ċar li l-poplu?

936
00:46:43,450 --> 00:46:45,700
>> ROB: Id-differenza bejn il-verżjoni uppercase u zghar huwa

937
00:46:45,700 --> 00:46:49,250
dejjem biss ser ikun 32, u għalhekk huwa dejjem se tkun daqsxejn waħda

938
00:46:49,250 --> 00:46:51,840
li teħtieġ li tiġi flipped li jibdlu bejn it-tnejn.

939
00:46:51,840 --> 00:46:54,330
ALI: Allura f'dak il-każ, li jafu d-differenza bejn il-kapital A u

940
00:46:54,330 --> 00:46:57,130
l-zghar li hija ħaġa tajba.

941
00:46:57,130 --> 00:47:01,950
Mhux fil-kodiċi tiegħek, iżda kunċettwalment-inqas, dan huwa tajjeb.

942
00:47:01,950 --> 00:47:05,880
Allura inti guys tista 'tmur quddiem u l-kodiċi li Spazji issa.

943
00:47:05,880 --> 00:47:08,580
Jew għandna biss jiddiskutu dan?

944
00:47:08,580 --> 00:47:09,760
ROB: Nistgħu biss jiddiskutu dan.

945
00:47:09,760 --> 00:47:10,680
I do not know.

946
00:47:10,680 --> 00:47:11,680
You guys tista 'tipprova.

947
00:47:11,680 --> 00:47:13,560
Talk lilek innifsek fost għal bit.

948
00:47:13,560 --> 00:47:16,390
Aħna ser jagħtuk ċans għall-kodiċi dan.

949
00:47:16,390 --> 00:47:17,640
[INTERPOSING Voices]

950
00:47:19,785 --> 00:47:22,695
ALI: - huwa jibred

951
00:47:22,695 --> 00:47:26,590
SPEAKER 30: Dan huwa simili comedy Hacker.

952
00:47:26,590 --> 00:47:31,060
ALI: Yeah, aħna qed biss javżak l-aħbarijiet, għaddejja minn ġo fih.

953
00:47:31,060 --> 00:47:32,310
>> Rob: U aħna qed lura.

954
00:47:34,950 --> 00:47:35,405
ALI: Dak it-tip ta 'stramb.

955
00:47:35,405 --> 00:47:38,720
Inħoss bħal għandu jkollna stazzjon aħbarijiet CS50 u nistgħu

956
00:47:38,720 --> 00:47:41,500
attwalment ipoġġu bħal dan.

957
00:47:41,500 --> 00:47:43,500
ROB: Hacker Aħbarijiet.

958
00:47:43,500 --> 00:47:46,848
ALI: Hacker Aħbarijiet 50.

959
00:47:46,848 --> 00:47:49,210
ALI: Ħossok liberu li jistaqsu mistoqsijiet jekk int konfuż.

960
00:47:52,280 --> 00:47:53,980
ROB: staġnati ħadd Jinsab?

961
00:47:53,980 --> 00:47:57,160
ALI: Yeah, li l-ħaġa tajba.

962
00:47:57,160 --> 00:47:58,590
ALI: Stenna, inti staġnati siġġu tiegħek?

963
00:47:58,590 --> 00:48:01,010
Oh.

964
00:48:01,010 --> 00:48:02,260
I kien ftit konċernat.

965
00:48:06,670 --> 00:48:12,150
ROB: Minħabba I biss induna li aħna tmur jridu

966
00:48:12,150 --> 00:48:13,300
operatur ieħor bitwise.

967
00:48:13,300 --> 00:48:16,985
Għal issa, ejja biss jikkonvertu uppercase zghar li.

968
00:48:23,280 --> 00:48:25,220
ALI: Jiddispjacini, ma kulħadd tikseb dik tħabbira?

969
00:48:25,220 --> 00:48:27,755
Aħna ser imorru minn uppercase zghar sa.

970
00:48:27,755 --> 00:48:30,990
ROB: Imbagħad aħna ser jiddiskutu zghar li uppercase dritt wara dik.

971
00:48:33,820 --> 00:48:36,650
Oh, no.

972
00:48:36,650 --> 00:48:39,560
Għandna bug f'dan, li, I raden, aħna qatt ppruvaw jiddekorri.

973
00:48:39,560 --> 00:48:44,140
Liema huwa biss li char ċ jeħtieġ li jiġu ddikjarati barra tal-linja, għax

974
00:48:44,140 --> 00:48:45,805
ambitu tagħha huwa ristrett fil-linja.

975
00:48:49,200 --> 00:48:53,060
SPEAKER 32: F'dan il-każ, huwa żbaljat li jużaw numru?

976
00:48:53,060 --> 00:48:56,930
ROB: Eh, inti m'għandekx bżonn.

977
00:48:56,930 --> 00:49:02,040
Jekk I garantit inti li l-kapital "A'- jew, zghar" a "kapital nieqes" A "

978
00:49:02,040 --> 00:49:09,340
kien eżattament waħda daqsxejn, iżda li ma tafx 32 huwa -

979
00:49:09,340 --> 00:49:13,160
affarijiet se taħdem biss kif ukoll kieku kien il-bit 16 li kien flipped - jew

980
00:49:13,160 --> 00:49:14,610
no, I raden wouldn't -

981
00:49:14,610 --> 00:49:18,270
jew il-bit 64 kienu flipped, possibilment.

982
00:49:18,270 --> 00:49:23,230
Imma inti m'għandekx bżonn tuża 32.

983
00:49:23,230 --> 00:49:26,141
Inti tista 'minflok jużaw zghar "A" "a" kapital nieqes.

984
00:49:26,141 --> 00:49:29,340
>> SPEAKER 32: Okay.

985
00:49:29,340 --> 00:49:32,996
X'tista 'tagħmel jekk tħoss bħal int bil-miktub wisq huwa inti tista' tiddefinixxi lilha

986
00:49:32,996 --> 00:49:33,435
fil-quċċata.

987
00:49:33,435 --> 00:49:41,830
Allura inti tista 'tkun simili, int differenza = zghar "A" "a" kapital nieqes. U

988
00:49:41,830 --> 00:49:43,980
allura inti tista tip differenza minflok.

989
00:49:43,980 --> 00:49:45,110
Li validu.

990
00:49:45,110 --> 00:49:48,002
Iżda biss bl-użu numru 32 huwa tip ta '-

991
00:49:48,002 --> 00:49:51,104
SPEAKER 33: Anki jekk huwa minħabba l-fatt li huwa l-32 bit?

992
00:49:51,104 --> 00:49:52,570
ALI: Yeah.

993
00:49:52,570 --> 00:49:54,960
ROB: Jista 'jkun hemm -

994
00:49:54,960 --> 00:49:57,780
l-unika garanzija li għandna bżonn tagħmel lilek hija li d-differenza bejn il-

995
00:49:57,780 --> 00:49:59,480
zghar u uppercase huwa wieħed daqsxejn.

996
00:49:59,480 --> 00:50:04,670
M'għandux jimpurtax li jiġri li jkun il-bit 32 li l-flipped.

997
00:50:04,670 --> 00:50:06,610
Għal konsiderazzjonijiet ħin, aħna ser tibda tmur fuq dan.

998
00:50:09,170 --> 00:50:10,370
Huwa okay jekk int ma lest.

999
00:50:10,370 --> 00:50:13,090
Tinkwetax dwar dan.

1000
00:50:13,090 --> 00:50:16,260
ROB: Jekk wieħed jassumi c hija ittra kapitali -

1001
00:50:16,260 --> 00:50:18,030
aħna ma jkollhomx biex jassumu c hija ittra kapitali.

1002
00:50:18,030 --> 00:50:20,750
Nafu c hija ittra kapitali wara li dan loop filwaqt li -

1003
00:50:20,750 --> 00:50:22,160
do-waqt loop.

1004
00:50:22,160 --> 00:50:28,590
Allura dan ifisser jidher xi ħaġa bħal din "A". Mela jekk irridu li tressaq dan ir-

1005
00:50:28,590 --> 00:50:32,895
"A" għal din "a", dak li għandna bżonn tagħmel?

1006
00:50:36,890 --> 00:50:41,920
Allura kif nistgħu jikkonvertu u għatu flip-bit?

1007
00:50:48,040 --> 00:50:49,450
ALI: Kif nistgħu flip?

1008
00:50:49,450 --> 00:50:53,010
>> ROB: Allura nafu aħna rridu li flip-bit 32.

1009
00:50:53,010 --> 00:50:59,722
Allura li se jagħmlu "a" minus "A", jew nistgħu tikteb 32, iżda -

1010
00:50:59,722 --> 00:51:03,090
darn dan, huwa l-mod ieħor madwar.

1011
00:51:03,090 --> 00:51:07,250
ALI: Okay hekk Rob hawn s kalkolu ta 'dak in-numru, in-numru magic 32.

1012
00:51:07,250 --> 00:51:12,000
Hekk hu konstatazzjoni fejn dik iż-żona flip daqsxejn jkun.

1013
00:51:12,000 --> 00:51:14,810
U allura dak li nitfgħu fejn il-trade marks in kwistjoni huma?

1014
00:51:14,810 --> 00:51:16,740
ROB: Kif nistgħu flip li ftit?

1015
00:51:16,740 --> 00:51:22,784
F'termini ta 'l-ittra kapitali, huwa 0, u rridu li ssir 1.

1016
00:51:22,784 --> 00:51:23,660
SPEAKER 34: |.

1017
00:51:23,660 --> 00:51:24,910
ROB: Yeah.

1018
00:51:28,780 --> 00:51:38,190
Allura dan huwa magħna qal nieħdu "A". Aħna qed oring ma 0 -

1019
00:51:38,190 --> 00:51:40,750
1000 -

1020
00:51:40,750 --> 00:51:44,720
u li dan =.

1021
00:51:44,720 --> 00:51:45,930
ALI: Does li jagħmel sens għal kulħadd?

1022
00:51:45,930 --> 00:51:48,812
Aħna tista 'tmur permezz ta' dan ftit ftit jekk inti tixtieq.

1023
00:51:52,030 --> 00:51:56,300
SPEAKER 35: Inti [inaudible]?

1024
00:51:56,300 --> 00:51:57,590
ALI: Fejn hi l-sinjal tal-minus?

1025
00:51:57,590 --> 00:51:58,500
ROB: Oh, inti tfisser fil hawn?

1026
00:51:58,500 --> 00:51:59,070
ALI: Oh, yeah.

1027
00:51:59,070 --> 00:52:00,140
ROB: So I raden dan huwa magħna.

1028
00:52:00,140 --> 00:52:05,670
Nistgħu ngħidu 32, u issa aħna qed biss bl-użu l-operaturi bitwise.

1029
00:52:05,670 --> 00:52:07,010
ALI: Aħna ma simili numri magic.

1030
00:52:07,010 --> 00:52:10,460
Aħna mhux se tagħmel dan.

1031
00:52:10,460 --> 00:52:13,592
Ukoll I think we għandhom biss jużaw operatur bitwise -

1032
00:52:13,592 --> 00:52:19,042
SPEAKER 36: Jekk tuża ^ A, ser ikollok 32?

1033
00:52:19,042 --> 00:52:19,980
SPEAKER 37: Yeah, I think -

1034
00:52:19,980 --> 00:52:21,090
ROB: Yeah inti se.

1035
00:52:21,090 --> 00:52:23,320
ALI: Dan huwa kif inti għamlu dan biex imur

1036
00:52:23,320 --> 00:52:25,370
mill-kapital li zghar.

1037
00:52:25,370 --> 00:52:31,130
>> Issa jista 'xi ħadd tell me why Rob u I biddel il-pront u kif aħna marru

1038
00:52:31,130 --> 00:52:34,040
mill zghar uppercase, minflok zghar li

1039
00:52:34,040 --> 00:52:37,810
uppercase kif għamilna qabel?

1040
00:52:37,810 --> 00:52:44,520
Ħadd ma jkollu xi ideat għaliex dan jista 'jkun aktar diffiċli?

1041
00:52:44,520 --> 00:52:44,880
ROB: Allura aħna'd tagħmel -

1042
00:52:44,880 --> 00:52:46,178
ALI: Yeah, imorru quddiem.

1043
00:52:46,178 --> 00:52:49,640
SPEAKER 38: L | operatur kien biss verament tajba biex jiżdiedu.

1044
00:52:49,640 --> 00:52:51,200
ALI: Yeah, eżattament.

1045
00:52:51,200 --> 00:52:58,320
ROB: Allura dak li rridu nagħmlu fil-zghar li uppercase każ,

1046
00:52:58,320 --> 00:53:00,175
jikkonvertu dan a'"-

1047
00:53:08,540 --> 00:53:14,820
hekk aħna tixtieq li jitqiegħdu f'xi numri hawn u l-użu xi operatur sabiex niġu

1048
00:53:14,820 --> 00:53:21,910
biex kapital A. Aħna xorta probabbilment jużaw 32 b'xi, iżda issa kif do we

1049
00:53:21,910 --> 00:53:25,280
nikseb dan biex toħroġ għal dan?

1050
00:53:40,910 --> 00:53:42,750
Allura c -

1051
00:53:42,750 --> 00:53:44,000
oh, I xorta jridu li wisq -

1052
00:53:46,940 --> 00:53:51,055
ALI: Allura issa jekk aħna qed jikkonvertu mill zghar li uppercase mill-ġdid, allura aħna

1053
00:53:51,055 --> 00:53:55,170
jagħmlu l-operazzjoni ^, kif inti guys qal.

1054
00:53:55,170 --> 00:53:57,650
ROB: Hemm modi oħra li tista 'tagħmel l-affarijiet.

1055
00:53:57,650 --> 00:54:01,680
A lott ta 'l-operaturi bitwise jispiċċa jkun ħafna faċilment definibbli f'termini

1056
00:54:01,680 --> 00:54:03,460
ta 'operaturi bitwise oħra.

1057
00:54:03,460 --> 00:54:11,150
So I kienet se jużawx ^ jew għal kollox, iżda ^ ħadmu b'mod perfett multa.

1058
00:54:11,150 --> 00:54:17,910
>> ALI: Okay, hekk aħna qed tmur biex jmorru lejn il-problema aħħar, li huwa li bażika -

1059
00:54:17,910 --> 00:54:22,390
il-problema aħħar huwa li jikkonvertu xi ħaġa fil-binarju.

1060
00:54:22,390 --> 00:54:26,350
Għalhekk, per eżempju, inti għandek 50, u allura inti jikkonvertu lill

1061
00:54:26,350 --> 00:54:31,400
binarja, li hija 110010.

1062
00:54:31,400 --> 00:54:36,010
U naħseb li inti guys lkoll nafu dwar binarju minn lecture.

1063
00:54:36,010 --> 00:54:39,270
U inti wkoll mhux suppost li jagħmlu l-ebda 0s ewlieni lejn dan.

1064
00:54:39,270 --> 00:54:41,460
ROB: Inti tista 'tinjora dik il-parti għal issa.

1065
00:54:41,460 --> 00:54:45,250
L-ewwel pass, inti tista 'tagħmel dan hekk li hemm 0s ewlenin.

1066
00:54:45,250 --> 00:54:49,200
U allura aħna tista 'timmodifika dik li jkollha l-ebda 0s ewlieni, jekk ikollna ħin.

1067
00:54:49,200 --> 00:54:50,630
ALI: Allura ma joqogħdu jinkwetaw dwar dan.

1068
00:54:50,630 --> 00:54:52,620
Just nipprova nikseb fil-binarju.

1069
00:54:55,880 --> 00:54:59,855
A post tajjeb biex tibda tkun -

1070
00:54:59,855 --> 00:55:02,010
ROB: Għandna bżonn li jistaqsu għal numru sħiħ.

1071
00:55:02,010 --> 00:55:03,150
ALI: Oh yeah, li waħda tajba.

1072
00:55:03,150 --> 00:55:04,170
Aħna tista 'tibda ma' dak.

1073
00:55:04,170 --> 00:55:06,870
Allura tista 'tbiddel il-pront.

1074
00:55:06,870 --> 00:55:08,840
Allura minflok ta 'karattru, issa aħna qed jittrattaw ma' interi.

1075
00:55:13,670 --> 00:55:14,920
Kessaħ?

1076
00:55:20,630 --> 00:55:25,300
>> ROB: U issa dak li huwa tagħna do-waqt kundizzjoni se tkun?

1077
00:55:25,300 --> 00:55:27,750
Huwa tistaqsi għal integer mhux negattiva.

1078
00:55:31,080 --> 00:55:34,280
ALI: Meta irridu li żżomm li ġiegħlet lill-utent għal xi ħaġa oħra?

1079
00:55:34,280 --> 00:55:35,950
Meta huwa iżgħar minn 0.

1080
00:55:35,950 --> 00:55:36,760
ALI:. Dritt

1081
00:55:36,760 --> 00:55:38,010
ROB: Filwaqt i huwa inqas minn 0.

1082
00:55:41,090 --> 00:55:45,120
ALI: Issa rridu li jaqilbu.

1083
00:55:45,120 --> 00:55:48,150
Do you guys xi ideat ta 'x'għandek tagħmel?

1084
00:55:48,150 --> 00:55:49,400
Kwalunkwe inklings?

1085
00:55:53,610 --> 00:55:54,984
Yeah.

1086
00:55:54,984 --> 00:55:57,344
SPEAKER 39: Do irridu jissarfu, jew nistgħu biss print xi 0s u 1s

1087
00:55:57,344 --> 00:55:58,760
li jkun in-numru dritt?

1088
00:55:58,760 --> 00:56:02,070
Tista 'tagħmel għat-loop u jgħodd mill poteri ta' 2?

1089
00:56:02,070 --> 00:56:03,320
ROB: Iva.

1090
00:56:05,750 --> 00:56:08,425
Inti ma għandekx bżonn li jikkonvertu i li binarja tagħha -

1091
00:56:08,425 --> 00:56:13,720
ir-rappreżentazzjoni binarja ta 'i mhux se jaqbel ġewwa ta' i.

1092
00:56:13,720 --> 00:56:19,090
Inti biss ħtieġa li jistampaw ir-rappreżentazzjoni binarja ta 'i.

1093
00:56:19,090 --> 00:56:21,010
ALI: Fi kliem ieħor, inti m'għandekx bżonn li jmorru permezz setgħat ta 'tnejn.

1094
00:56:21,010 --> 00:56:23,710
ROB: Minħabba i diġà qed maħżuna bħala binaries, sabiex inti m'għandekx bżonn li

1095
00:56:23,710 --> 00:56:25,110
jaqilbu għall binarja.

1096
00:56:25,110 --> 00:56:27,260
Just go fuq binarju tagħha, u jistampaw.

1097
00:56:30,080 --> 00:56:32,140
U int ser bżonn tuża bitwise, għaliex inti tixtieq li tħares lejn

1098
00:56:32,140 --> 00:56:33,390
l-bits attwali.

1099
00:56:37,060 --> 00:56:38,600
Inti ma għandekx bżonn li jużaw bitwise, iżda jekk jogħġbok do.

1100
00:56:44,130 --> 00:56:47,160
U li attwalment -

1101
00:56:47,160 --> 00:56:50,200
inti biss tista 'tagħmel is-setgħat ta' tnejn bil-multiplikazzjoni bi 2.

1102
00:56:50,200 --> 00:56:55,120
Aħna ser jmorru fuq waħda mill-aħħar żewġ operaturi binarji bitwise,

1103
00:56:55,120 --> 00:56:56,410
li huwa dan wieħed.

1104
00:56:56,410 --> 00:56:58,730
Allura meta inti tieħu -

1105
00:56:58,730 --> 00:57:00,083
>> ALI: Tista jgħaddu tnejn minnhom?

1106
00:57:00,083 --> 00:57:01,440
ROB: Yeah.

1107
00:57:01,440 --> 00:57:03,050
Mela ejja jmorru ma 9.

1108
00:57:03,050 --> 00:57:05,210
Allura 9 shift xellug 1 -

1109
00:57:05,210 --> 00:57:12,220
dak xellug tfisser bidla huwa biss jiċċaqalqu l-bits lejn ix-xellug u daħħal 0.

1110
00:57:12,220 --> 00:57:15,530
Allura aħna qed jiċċaqalqu l-bits tad-9 ta 'dik ix-xellug

1111
00:57:15,530 --> 00:57:20,240
pożizzjoni, li jagħtina -

1112
00:57:26,530 --> 00:57:31,570
Allura avviż aħna mexxew kollox telaq minn wieħed, u daħħal 0 fit-

1113
00:57:31,570 --> 00:57:32,730
dritt tal-ġenb.

1114
00:57:32,730 --> 00:57:36,755
Jekk aħna kien qaleb tħallew mill tnejn, aħna se bidla dak kollu li tħallew mill tnejn,

1115
00:57:36,755 --> 00:57:41,950
u jiddaħħlu żewġ 0s biex timla l-lakuni.

1116
00:57:41,950 --> 00:57:43,200
Mistoqsija?

1117
00:57:44,890 --> 00:57:47,510
ALI: Allura mbagħad bidla dritt ma xi ħaġa simili.

1118
00:57:47,510 --> 00:57:53,190
Jekk għandek 9 shift dritt 1, imbagħad int biss jiċċaqalqu kollox fuq li

1119
00:57:53,190 --> 00:57:57,890
id-dritt, inti titlef ċifri, hekk minflok 100.

1120
00:57:57,890 --> 00:58:04,142
ROB: Allura inti huwa multa li inti qed jitilfu l-ftit li ġara li tkun kollha

1121
00:58:04,142 --> 00:58:05,200
il-mod lejn il-lemin.

1122
00:58:05,200 --> 00:58:08,850
Hemm tipi differenti ta 'xiftijiet dritt, imma bażikament inti tista' taħseb

1123
00:58:08,850 --> 00:58:11,410
dritt shift biss bħala diviż bi 2.

1124
00:58:11,410 --> 00:58:14,430
U inti tista 'taħseb bidla xellug kif multiplikazzjoni bi 2.

1125
00:58:14,430 --> 00:58:16,490
Mela jekk inti konvertiti dan -

1126
00:58:16,490 --> 00:58:22,350
jekk inti konvertiti 9 shift 1, li huwa ugwali għal 10,010, jekk inti fil-fatt marret

1127
00:58:22,350 --> 00:58:25,100
permezz tal-binarju u dehret dak li kien, ikun biss tkun 18.

1128
00:58:25,100 --> 00:58:26,880
Aħna biss immoltiplika bi 2.

1129
00:58:26,880 --> 00:58:30,982
1001 shift xellug 2 se tkun 36.

1130
00:58:30,982 --> 00:58:32,400
Aħna immultiplika b'4.

1131
00:58:41,740 --> 00:58:45,360
Okay, berred, b'tali mod li operatur bitwise handy għal dan wieħed.

1132
00:58:52,570 --> 00:58:53,330
Konfużjoni Aktar?

1133
00:58:53,330 --> 00:58:54,870
Do you guys jridu jippruvaw it out?

1134
00:58:54,870 --> 00:58:58,970
Jew nistgħu biss jaqbżu dritt u jibdew dan?

1135
00:58:58,970 --> 00:59:01,140
ROB: Għandna probabbilment jaqbżu dritt pulzieri

1136
00:59:01,140 --> 00:59:01,880
ALI: Yeah, Okay.

1137
00:59:01,880 --> 00:59:03,370
Rob: U jimxu permezz tiegħu flimkien.

1138
00:59:03,370 --> 00:59:04,440
>> ALI: Well I ser biss jmorru fis dan.

1139
00:59:04,440 --> 00:59:09,700
Hekk kif qal fil-bidu, aħna qed tmur biex biss jgħaddu ftit ftit.

1140
00:59:09,700 --> 00:59:11,890
Allura aħna qed tmur għall-ħtieġa ta 'linja.

1141
00:59:11,890 --> 00:59:16,730
Ħadd ma jkollu idea tal-aħjar it-tip ta 'linja li tgħaddi minn dan?

1142
00:59:16,730 --> 00:59:20,544
Aħna loops filwaqt, do-waqt loops, għal-linji.

1143
00:59:20,544 --> 00:59:22,400
SPEAKER 40: Do-waqt loop?

1144
00:59:22,400 --> 00:59:25,150
ROB: Mela ftakar dak li għidt qabel dwar, aħna biss jużaw do-waqt li

1145
00:59:25,150 --> 00:59:27,390
loops tikseb jintuza mill-utent.

1146
00:59:27,390 --> 00:59:30,890
Inti qatt ma se pretty ħafna qatt jużawhom għal xi ħaġa oħra.

1147
00:59:30,890 --> 00:59:33,660
ALI: Il-problema bil-do-waqt linji huwa ma xi ħaġa qabel hija tikkontrolla għal

1148
00:59:33,660 --> 00:59:34,470
il-kundizzjoni.

1149
00:59:34,470 --> 00:59:36,540
Għalhekk, jista 'jagħmel xi ħaġa ħażina -

1150
00:59:36,540 --> 00:59:38,640
simili, iweġġgħu -

1151
00:59:38,640 --> 00:59:40,350
tagħmel xi ħaġa li mhux possibbli.

1152
00:59:40,350 --> 00:59:42,290
Allura inti tixtieq li jiċċekkjaw l-ewwel.

1153
00:59:42,290 --> 00:59:47,620
ROB: Hemm ħafna ta 'każijiet fejn inti tista' tuża do-waqt loops, imma n-nies

1154
00:59:47,620 --> 00:59:52,120
ma jistennew li inti jużawhom sakemm huwa jintuza mill-utent.

1155
00:59:52,120 --> 00:59:54,215
Allura aħna użaw tagħna do-waqt li loop tikseb i.

1156
00:59:57,160 --> 01:00:01,260
Kemm-il darba huwa loop tagħna tmur jridu loop?

1157
01:00:01,260 --> 01:00:04,060
Aħna rridu li jiffurmaw ingassa kull wieħed mill-bits ta 'i.

1158
01:00:04,060 --> 01:00:06,302
Kemm bits huma i?

1159
01:00:06,302 --> 01:00:07,266
SPEAKER 41: 32.

1160
01:00:07,266 --> 01:00:07,750
ALI: Yeah.

1161
01:00:07,750 --> 01:00:09,850
ROB: Allura hemm 32 bits.

1162
01:00:09,850 --> 01:00:12,920
Aħna ma rridux li ngħid 32.

1163
01:00:12,920 --> 01:00:16,230
Aħna minflok jridu jgħidu sizeof -

1164
01:00:16,230 --> 01:00:18,226
li, qatt raw li fil-klassi għadhom?

1165
01:00:18,226 --> 01:00:19,100
ALI: Nope.

1166
01:00:19,100 --> 01:00:20,380
ROB: Għaliex ma jgħidu li jintuża dan -

1167
01:00:20,380 --> 01:00:22,160
sizeof (int) darbiet 8 -

1168
01:00:22,160 --> 01:00:23,530
ALI: Allura, sizeof hija -

1169
01:00:23,530 --> 01:00:27,050
>> SPEAKER 42: [inaudible]

1170
01:00:27,050 --> 01:00:27,440
ALI:. Interessanti

1171
01:00:27,440 --> 01:00:31,610
Għalhekk, sizeof huwa funzjoni C built-in fejn hija biss jgħidlek il-

1172
01:00:31,610 --> 01:00:32,500
numru ta 'bits fil -

1173
01:00:32,500 --> 01:00:33,220
ROB: Bytes.

1174
01:00:33,220 --> 01:00:34,210
ALI: Bytes, sorry -

1175
01:00:34,210 --> 01:00:39,990
in-numru ta 'bytes li varjabbli għandha taħżen valur.

1176
01:00:39,990 --> 01:00:46,205
So I think hu marru fuq fil-klassi, allura, l-int huwa 4 bytes forsi.

1177
01:00:46,205 --> 01:00:46,610
Kessaħ?

1178
01:00:46,610 --> 01:00:50,610
ROB: Imma inti m'għandekx bżonn tkun taf li int huwa ta '4 bytes.

1179
01:00:50,610 --> 01:00:52,670
Għandek tkun tista 'tgħid -

1180
01:00:52,670 --> 01:00:55,870
għandek tuża sizeof (int) biex tikseb 4 bytes.

1181
01:00:55,870 --> 01:00:59,170
U li attwalment importanti għal xi affarijiet.

1182
01:00:59,170 --> 01:01:01,650
L int tista 'ma tkunx 4 bytes.

1183
01:01:01,650 --> 01:01:04,050
Fuq ieħor kompjuter, int tista 'tkun 8 bytes.

1184
01:01:04,050 --> 01:01:08,500
Allura programm tiegħek mhux se taħdem fuq li l-kompjuter għaliex inti hard-kodifikati 32

1185
01:01:08,500 --> 01:01:12,230
bits meta fuq dik il-kompjuter jiġri li jkun 64 bits.

1186
01:01:12,230 --> 01:01:15,260
ALI: Allura inti għandek l-għadd totali ta 'bits li inti tixtieq sabiex terġa' lura.

1187
01:01:15,260 --> 01:01:17,480
Rob: U d-differenza bejn byte u daqsxejn hija li hemm

1188
01:01:17,480 --> 01:01:19,100
huma 8 bits fil-byte.

1189
01:01:19,100 --> 01:01:22,110
Allura sizeof (int) prospetti 4 bytes, allura għandna li jimmultiplikaw li

1190
01:01:22,110 --> 01:01:24,420
bi 8 tikseb 32 bits.

1191
01:01:24,420 --> 01:01:27,680
>> ALI: Okay, hekk nafu l-massimu u nafu irridu imorru minn -

1192
01:01:27,680 --> 01:01:29,260
irridu jgħaddu kollha kemm huma.

1193
01:01:29,260 --> 01:01:32,950
Allura aħna tixtieq li tmur minn 0 sa numBits.

1194
01:01:32,950 --> 01:01:37,160
Allura ħadd ma jaf kif jiktbu l-linja għal dan?

1195
01:01:37,160 --> 01:01:37,790
Kulħadd?

1196
01:01:37,790 --> 01:01:39,680
SPEAKER 43: [inaudible]

1197
01:01:39,680 --> 01:01:44,130
ALI: Allura inti tixtieq li travers-numru i mir-bit 0 għall-

1198
01:01:44,130 --> 01:01:47,840
ewwel ftit, il-bit-tieni, il-bit-tielet, it-triq kollha sa numBits.

1199
01:01:47,840 --> 01:01:50,972
L-għadd massimu ta 'bits li tista' tikseb l-.

1200
01:01:54,420 --> 01:01:57,780
ROB: X'hemm-linja komuni nużaw dak li rridu nagħmlu drabi x xi ħaġa?

1201
01:01:57,780 --> 01:01:58,280
ALI: Għall.

1202
01:01:58,280 --> 01:01:59,280
Perfect.

1203
01:01:59,280 --> 01:02:00,440
Allura għandna għal.

1204
01:02:00,440 --> 01:02:05,242
U allura aħna ser joħolqu iterator, li mhux se tkun i.

1205
01:02:05,242 --> 01:02:06,850
ROB: j.

1206
01:02:06,850 --> 01:02:08,080
ALI: J = 0.

1207
01:02:08,080 --> 01:02:09,740
Allura aħna ser tibda fil 0.

1208
01:02:09,740 --> 01:02:13,110
U allura aħna qed tmur biex ikollhom il-kundizzjoni tagħmel żgur, waqt li int

1209
01:02:13,110 --> 01:02:14,968
għaddejja minn ġo fih kull wieħed ħin -

1210
01:02:14,968 --> 01:02:16,960
[INTERPOSING Voices]

1211
01:02:16,960 --> 01:02:17,960
ROB: j.

1212
01:02:17,960 --> 01:02:19,970
ALI: j huwa inqas minn numBits.

1213
01:02:19,970 --> 01:02:23,680
Allura aħna ma rridux li tagħmel l-attwali daqs wieħed, għaliex qed numBits

1214
01:02:23,680 --> 01:02:25,365
totali, u nibdew ta '0.

1215
01:02:25,365 --> 01:02:26,360
Allura aħna qed attwalment se jkollhom -

1216
01:02:26,360 --> 01:02:27,400
SPEAKER 44: Oh.

1217
01:02:27,400 --> 01:02:29,300
ALI: L-indiċi ma jiqfux mal numBits minus 1.

1218
01:02:29,300 --> 01:02:34,070
ROB: Aħna jittikkettjaw il-bits 0-31, aħna ma ttikkettati 1-32.

1219
01:02:34,070 --> 01:02:36,970
ALI: U allura aħna qed tmur biex inkrement kull darba minn wieħed, għaliex irridu li

1220
01:02:36,970 --> 01:02:38,050
jivverifikaw kull wieħed.

1221
01:02:38,050 --> 01:02:39,851
Allura aħna ser imorru j + +.

1222
01:02:39,851 --> 01:02:42,740
>> SPEAKER 45: Għaliex inti tagħmel dan?

1223
01:02:42,740 --> 01:02:46,100
SPEAKER 46: Għalfejn qed għaddejjin kull daqsxejn?

1224
01:02:46,100 --> 01:02:49,310
ROB: Allura irridu li jmorru permezz kull daqsxejn u -

1225
01:02:52,780 --> 01:02:55,100
Mela ejja ngħidu li għandna xi numru.

1226
01:02:55,100 --> 01:02:56,195
ALI: 68.

1227
01:02:56,195 --> 01:02:57,470
ROB: Nistgħu nużaw 68.

1228
01:02:57,470 --> 01:03:00,450
Allura l-binarju li għaddej biex tkun 100100.

1229
01:03:00,450 --> 01:03:05,540
Allura dan huwa ġewwa ta 'i u rridu li jmorru fuq kull wieħed minn dawn bits.

1230
01:03:05,540 --> 01:03:06,450
Huwa ta '1?

1231
01:03:06,450 --> 01:03:07,320
Stampa 1.

1232
01:03:07,320 --> 01:03:08,120
Huwa ta '0?

1233
01:03:08,120 --> 01:03:09,100
Stampa 0.

1234
01:03:09,100 --> 01:03:10,530
Imbagħad immorru fuq il-ftit li jmiss.

1235
01:03:10,530 --> 01:03:11,210
Huwa ta '1?

1236
01:03:11,210 --> 01:03:11,610
Stampa 1.

1237
01:03:11,610 --> 01:03:11,830
Huwa 0?

1238
01:03:11,830 --> 01:03:13,080
Stampa 0.

1239
01:03:14,880 --> 01:03:16,710
ALI: Kessaħ, okay.

1240
01:03:16,710 --> 01:03:22,880
Issa aħna qed fil-indiċi korrett għal fejn li ftit hu.

1241
01:03:25,380 --> 01:03:28,080
Kif nistgħu jivverifika li wieħed speċifiku?

1242
01:03:28,080 --> 01:03:33,130
Ejja ngħidu aħna qed fil j = 0, hekk irridu li jiċċekkjaw l-indiċi 0 tal-bit.

1243
01:03:33,130 --> 01:03:37,980
Għalhekk, f'dan il-każ, dan wieħed.

1244
01:03:37,980 --> 01:03:41,930
>> Allura issa kif do we go dwar check - oh, ikun dan wieħed.

1245
01:03:41,930 --> 01:03:42,810
ROB: Yeah.

1246
01:03:42,810 --> 01:03:44,310
ALI: Jiddispjacini.

1247
01:03:44,310 --> 01:03:47,930
Kif immorru dwar il-kontroll li wieħed, fis-sens?

1248
01:03:47,930 --> 01:03:52,030
Kif aħna jiċċekkjaw jekk huwa ta '0 jew 1?

1249
01:03:52,030 --> 01:03:52,730
Well let's -

1250
01:03:52,730 --> 01:03:53,940
KLASSI: U 1?

1251
01:03:53,940 --> 01:03:54,390
ALI: U?

1252
01:03:54,390 --> 01:03:55,010
Yeah.

1253
01:03:55,010 --> 01:03:57,810
ROB: Mela ejja ngħidu li diġà għandna 1.

1254
01:03:57,810 --> 01:04:02,470
Imbagħad din &, din se terġa 'lura jekk kienx ta' 1 jew 0.

1255
01:04:05,580 --> 01:04:08,200
ALI: Allura nistgħu jinżlu.

1256
01:04:08,200 --> 01:04:10,695
U nistgħu nagħmlu bħala inti guys qal, 'kif isir il-& funzjoni.

1257
01:04:13,810 --> 01:04:15,560
ROB: int -

1258
01:04:15,560 --> 01:04:18,290
kif do Irrid ngħid dan -

1259
01:04:18,290 --> 01:04:24,250
isone = i.

1260
01:04:24,250 --> 01:04:29,770
U għall-ewwel ftit aħna jiġri li tkun tħares lejn, aħna qed tagħmel i & 1.

1261
01:04:29,770 --> 01:04:33,302
Issa dak li aħna se jixtiequ u mill ghall-bit tieni?

1262
01:04:33,302 --> 01:04:34,294
SPEAKER 47: 2.

1263
01:04:34,294 --> 01:04:36,110
ROB: Yeah, it-tieni li aħna qed dwar 2.

1264
01:04:36,110 --> 01:04:39,100
ALI: Int ser ikollok avviż li l-1 mxiet fuq il-waħda xellug.

1265
01:04:39,100 --> 01:04:44,320
Allura li aħna tgħallimna xi operaturi bitwise tagħmel dik il-funzjoni?

1266
01:04:44,320 --> 01:04:45,160
ROB: Il-wieħed li jmiss -

1267
01:04:45,160 --> 01:04:46,280
ALI: Yeah, id-dritt, eżattament.

1268
01:04:46,280 --> 01:04:48,670
Allura huwa bidla xellug.

1269
01:04:48,670 --> 01:04:51,120
Minflok dejjem verifika ma '1, aħna qed tmur għall-bidla lilha.

1270
01:04:51,120 --> 01:04:53,470
U kif ħafna drabi huma aħna se bidla dan?

1271
01:04:53,470 --> 01:04:59,340
Jekk aħna qed iċċekkjar tal-1 0 allura aħna qed tmur biex jimxu dan matul iż-żero.

1272
01:04:59,340 --> 01:04:59,975
Yeah, eżattament.

1273
01:04:59,975 --> 01:05:02,090
Allura inti xellug shift lilha mill j.

1274
01:05:02,090 --> 01:05:02,550
Perfect.

1275
01:05:02,550 --> 01:05:03,550
Allura issa nafu -

1276
01:05:03,550 --> 01:05:06,450
aħna għandna dan int ta 'jekk li għamilhom 1, u mbagħad -

1277
01:05:10,690 --> 01:05:14,670
tant tip Rob ta 'qerq hawn -

1278
01:05:14,670 --> 01:05:18,090
u hekk issa kien jimxu 'l quddiem u hu biss qal li jekk fil-fatt huwa 1,

1279
01:05:18,090 --> 01:05:23,540
għaliex 1 tevalwa veru, hekk aħna ma jkollhom jgħidu ISF isone huwa ugwali għal 1 -

1280
01:05:23,540 --> 01:05:29,210
hekk jekk isone, allura aħna jistampaw 1, u inkella aħna istampar 0.

1281
01:05:29,210 --> 01:05:33,350
>> ROB: Allura programm tagħna għandha bug globali.

1282
01:05:33,350 --> 01:05:35,845
Ukoll, mistoqsijiet dwar din l-ewwel.

1283
01:05:35,845 --> 01:05:41,692
SPEAKER 48: Tista 'qatt tpoġġi l-isone ġewwa l-parti operat erba' u

1284
01:05:41,692 --> 01:05:47,804
allura li hija ċċaqlaq ruħha bħala l-aħħar parti?

1285
01:05:47,804 --> 01:05:50,050
Allura isone daqs 1 u mbagħad -

1286
01:05:50,050 --> 01:05:53,140
ROB: Iva, inti tista '.

1287
01:05:53,140 --> 01:05:57,200
Nistgħu attwalment juru li ladarba aħna tiffissa l-bug li jien waslet biex

1288
01:05:57,200 --> 01:06:00,050
jiddiskuti miegħek kollha.

1289
01:06:00,050 --> 01:06:03,470
Avviż tal-ordni aħna qed tmur fuq affarijiet.

1290
01:06:03,470 --> 01:06:10,570
Minħabba din ir-rappreżentanza binarja, aħna qed jibdew bil-ftit 0.

1291
01:06:10,570 --> 01:06:13,010
Jekk huwa ta '0, allura aħna l-istampar -

1292
01:06:13,010 --> 01:06:15,620
ukoll, huwa ta '0, hekk aħna l-istampar 0.

1293
01:06:15,620 --> 01:06:16,860
Imbagħad immorru l-ftit tieni.

1294
01:06:16,860 --> 01:06:19,100
Huwa 0, hekk aħna jistampaw 0.

1295
01:06:19,100 --> 01:06:20,290
Imbagħad immorru l-daqsxejn 3.

1296
01:06:20,290 --> 01:06:22,950
Huwa 1, hekk aħna jistampaw 1.

1297
01:06:22,950 --> 01:06:24,580
ALI: Allura li għaddej lura.

1298
01:06:24,580 --> 01:06:27,906
Allura kif inti guys jissuġġerixxu li aħna tiffissa din u jmorru l-mod ieħor?

1299
01:06:27,906 --> 01:06:28,900
SPEAKER 49: [inaudible]

1300
01:06:28,900 --> 01:06:29,490
ROB: Yeah.

1301
01:06:29,490 --> 01:06:34,500
Allura minflok tmur minn 0 sa numBits, aħna ser imorru minn bits numBits għal 0.

1302
01:06:34,500 --> 01:06:35,600
ALI: Allura [inaudible]

1303
01:06:35,600 --> 01:06:36,940
tista 'dejjem tmur l-mod ieħor.

1304
01:06:36,940 --> 01:06:38,970
ROB: NumBits minus 1, għaliex dak l-nubmer aħħar -

1305
01:06:38,970 --> 01:06:41,160
ALI: Minħabba din tmur 0-31.

1306
01:06:41,160 --> 01:06:44,420
U allura aħna ser dejjem jagħmlu ċert li huwa akbar minn 0 sabiex inti ma jmorrux

1307
01:06:44,420 --> 01:06:46,100
wisq lejn il-lemin.

1308
01:06:46,100 --> 01:06:48,800
U allura tkun taf dejjem naqqas sa l-1 biex tmur lejn il-lemin.

1309
01:06:48,800 --> 01:06:52,240
>> ROB: Allura issa għandna loop reverse, u n-numru huwa lura fis-istampar

1310
01:06:52,240 --> 01:06:53,586
fil-mod korrett.

1311
01:06:53,586 --> 01:06:57,560
SPEAKER 50: M'għandekx ikollok tibdel il-ħaġa bidla wisq?

1312
01:06:57,560 --> 01:06:58,810
ALI: Allura l-ebda.

1313
01:07:03,810 --> 01:07:06,470
ROB: Aħna qed tagħmel l-operazzjonijiet eżatt l-istess, ħlief issa

1314
01:07:06,470 --> 01:07:07,470
fl-ordni invers.

1315
01:07:07,470 --> 01:07:14,170
Allura minflok tagħmel l-ċaqliq minn numBits minus 1 sabiex tikseb xi din

1316
01:07:14,170 --> 01:07:17,430
bit hija, minflok tagħmel dan l-aħħar, aħna ser biss tagħmel dan l-ewwel.

1317
01:07:19,970 --> 01:07:22,970
Billi ddawwar dan up hawn, aħna jinqaleb l-ordni ta 'kollox

1318
01:07:22,970 --> 01:07:24,190
li jiġri ġewwa.

1319
01:07:24,190 --> 01:07:28,610
Iżda aħna ma rridux li tibdel dak li jiġri ġewwa fil-livelli kollha.

1320
01:07:28,610 --> 01:07:29,860
ALI: Does li jagħmel sens?

1321
01:07:32,240 --> 01:07:33,660
Ipproċessar?

1322
01:07:33,660 --> 01:07:41,200
Okay, hekk ma xi ħadd ieħor xi mistoqsijiet kunċettwali oħra?

1323
01:07:41,200 --> 01:07:45,030
ALI: Qabel immorru fil-punt tiegħu li tkun -

1324
01:07:45,030 --> 01:07:46,280
ALI: Kull dritt, sew go.

1325
01:07:48,350 --> 01:07:53,160
Rob: Minflok tuża j tkun tagħna -

1326
01:07:55,780 --> 01:08:00,550
minflok jużaw j li dejjem bidla minn, bħal wieħed j shift xellug, Naħseb li dak

1327
01:08:00,550 --> 01:08:04,120
int tgħid hi simili, li j użu nnifsu.

1328
01:08:04,120 --> 01:08:09,560
Allura għal j -

1329
01:08:09,560 --> 01:08:14,656
I raden dan huwa l-hard - j = 1 << 31.

1330
01:08:14,656 --> 01:08:16,200
Hija li dak li nixtieq?

1331
01:08:16,200 --> 01:08:18,470
Naħseb li huwa << 31.

1332
01:08:18,470 --> 01:08:22,840
j> = 1.

1333
01:08:22,840 --> 01:08:32,319
j >>, >> isone, i & j -

1334
01:08:32,319 --> 01:08:35,620
hekk issa minflok jużaw -

1335
01:08:35,620 --> 01:08:38,370
ALI: Inti dejjem miexja j minflok li jkollha

1336
01:08:38,370 --> 01:08:40,520
indiċi li jiċċekkjaha.

1337
01:08:40,520 --> 01:08:42,130
Mhuwiex dik ħażina.

1338
01:08:42,130 --> 01:08:43,960
Aħna qed tuża tip simili ta 'loġika.

1339
01:08:43,960 --> 01:08:46,202
Mela jekk inti tmur lura -

1340
01:08:46,202 --> 01:08:50,020
oh, iżda li għaddej biex titilfu.

1341
01:08:50,020 --> 01:08:51,380
Okay, int biss se tip-ġdid.

1342
01:08:51,380 --> 01:08:56,880
Jekk tinnota li għandna 1 j << ammont ta 'drabi, u konna

1343
01:08:56,880 --> 01:09:02,279
inkrementazzjoni j kull wieħed ħin minn wieħed inkrement, iżda din id-darba minflok

1344
01:09:02,279 --> 01:09:06,010
li qed isir l-inkrement tal j fil-quċċata ġewwa l-għar loop.

1345
01:09:06,010 --> 01:09:10,890
Allura minflok dejjem miexja l-isfel -

1346
01:09:10,890 --> 01:09:15,220
ROB: L-iterazzjoni ewwel ta 'l-għal linja, aħna għandna j huwa 10000.

1347
01:09:15,220 --> 01:09:20,000
L-iterazzjoni li jmiss tal-linja għall huwa 01000.

1348
01:09:20,000 --> 01:09:22,380
L-iterazzjoni li jmiss huwa li.

1349
01:09:22,380 --> 01:09:26,800
U l-1 huwa biss jmorru biex iżommu propagazzjoni isfel sakemm aħna hit-ħafna

1350
01:09:26,800 --> 01:09:29,729
il-għan, fejn issa huwa dan.

1351
01:09:29,729 --> 01:09:33,990
Il-wieħed li jmiss, l-1 se tkun imbuttat off, u j m'għadux aktar

1352
01:09:33,990 --> 01:09:35,090
minn jew ugwali għal 1.

1353
01:09:35,090 --> 01:09:38,380
I tista 'wkoll ipoġġi akbar minn 0, differenza istess.

1354
01:09:38,380 --> 01:09:41,580
U allura thats it.

1355
01:09:41,580 --> 01:09:43,720
Mistoqsijiet?

1356
01:09:43,720 --> 01:09:44,760
Yeah.

1357
01:09:44,760 --> 01:09:49,740
>> SPEAKER 51: [inaudible]

1358
01:09:49,740 --> 01:09:51,729
ROB: Allura dak l-istess -

1359
01:09:51,729 --> 01:09:57,270
inti dehru j + = 3?

1360
01:09:57,270 --> 01:10:00,960
Allura dan huwa l-istess bħal j = j + 3?

1361
01:10:00,960 --> 01:10:05,560
Tista 'tagħmel dan għal kważi kull operatur fil C. Allura j >> = 3 huwa

1362
01:10:05,560 --> 01:10:10,490
ugwali għal j = j >> 3.

1363
01:10:13,980 --> 01:10:16,760
Allura li jaħdem ukoll mal-operaturi bitwise.

1364
01:10:16,760 --> 01:10:19,630
U jien ma kellhomx jitqiegħdu 31 hawn.

1365
01:10:19,630 --> 01:10:23,790
I għandu jkollhom jitqiegħdu numBits - 1.

1366
01:10:23,790 --> 01:10:25,380
ALI: Yay, l-ebda numri magic.

1367
01:10:25,380 --> 01:10:29,070
Okay, huwa 4:00 għalkemm, hekk jekk inti guys jkollhom imorru - iżda ma dan jagħmel sens?

1368
01:10:29,070 --> 01:10:30,320
Do you guys xi mistoqsijiet oħra?

1369
01:10:33,920 --> 01:10:38,470
ROB: I kien ukoll se tarmi li jekk ridna -

1370
01:10:38,470 --> 01:10:41,326
ma huwa diskuss operatur ternarji fil-livelli kollha?

1371
01:10:41,326 --> 01:10:42,730
ALI: Le

1372
01:10:42,730 --> 01:10:45,090
Huwa okay.

1373
01:10:45,090 --> 01:10:46,970
ROB: Allura inti tista 'tħares lejn din għal ħin li jmiss.

1374
01:10:51,030 --> 01:10:52,080
ALI: Okay, tassew?

1375
01:10:52,080 --> 01:10:53,150
Issa int biss turi off.

1376
01:10:53,150 --> 01:10:54,210
ROB: L-ebda, issa it's -

1377
01:10:54,210 --> 01:11:00,490
dan huwa dak gets nies interessati, u issa dawn ser imorru tħares lejn dan.

1378
01:11:00,490 --> 01:11:02,640
Allura issa, li ma l-istess ħaġa, fi stadju wieħed.

1379
01:11:05,150 --> 01:11:10,950
Allura l-ewwel jivverifika, huwa i & j 1?

1380
01:11:10,950 --> 01:11:12,530
Huwa veru?

1381
01:11:12,530 --> 01:11:17,000
Jekk iva, stampar ta '1, inkella, stampar ta' 0.

1382
01:11:17,000 --> 01:11:19,190
ALI: Iżda tagħmel dan il-mod ieħor huwa perfettament multa ukoll.

1383
01:11:19,190 --> 01:11:20,920
Hija għandha l-istess loġika.

1384
01:11:20,920 --> 01:11:22,730
Allura mhuwiex simili wieħed huwa -

1385
01:11:22,730 --> 01:11:24,620
ROB: Fuq dan il-punt, nistgħu teħles minn dawk ċineg kaboċċi, għaliex dan huwa biss

1386
01:11:24,620 --> 01:11:27,190
one-linja għall loop.

1387
01:11:27,190 --> 01:11:29,370
ALI: Okay, hekk ma li jagħmel sens?

1388
01:11:29,370 --> 01:11:30,370
Dan kien it-tip ta 'qabża.

1389
01:11:30,370 --> 01:11:34,870
Iżda kien biss tip ta 'sintassi, aktar minn hekk.

1390
01:11:34,870 --> 01:11:36,250
>> Kessaħ?

1391
01:11:36,250 --> 01:11:37,500
Kwalunkwe mistoqsijiet oħra?

1392
01:11:40,880 --> 01:11:41,570
ROB: Kull dritt.

1393
01:11:41,570 --> 01:11:42,310
ALI: Kull dritt, berred.

1394
01:11:42,310 --> 01:11:43,560
Grazzi għall ġejjin għall-taqsima.