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[Powered by Google Translate] [Daqq tal-mużika]

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DAVID J. Malan: Dan huwa CS50.

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So I kien fejn inti issa xi snin ilu.

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U meta I kien freshman fil-ħin, I ma kienx verament fuq

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din it-triq ta 'kif isir ix-xjenza tal-kompjuter, li jagħmlu l-inġinerija.

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Tabilħaqq, I daħal fis dan il-post bħala konċentratur gvern.

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I ntlaqgħet, fl-iskola għolja, kid li

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Għoġobni affarijiet simili istorja.

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Għoġobni liġi kostituzzjonali, it-tip ta 'l-Ingliż u l-matematika.

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Huwa simili tip ta 'ukoll l-eqreb, iżda ma

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neċessarjament jaf affarijiet li kelli ma ġewx

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mgħallma fl-iskola għolja.

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U hekk sena freshman, I kellha din trepidation fejn anke

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għalkemm Għoġobni kompjuters, lagħbu logħob tal-kompjuter u l-

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simili, I ċertament qatt ma ħsibt ta lili nnifsi bħala

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persuna kompjuter, xjenzat kompjuter.

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U franchement, ħsibt ħbieb tiegħi fl-iskola għolja li

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kienu qed jieħdu xjenza tal-kompjuter kienu daqsxejn ta 'geeks.

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And yet, meta sirt hawn fuq il-kampus, kien hemm

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dan il-kors, CS50.

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>> U fil-ħin, huwa kellu din ir-reputazzjoni ta 'verament tkun

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xi ħaġa li beware.

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Kien kors tajba.

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Kien kors gost.

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Imma inti kellha fil-fatt tikseb li l-marda fil-bieb.

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U anki I ma tinqasam dik is-sena freshman limitu.

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U I marru fit-triq tiegħi li huwa konċentratur gvern, li tmur

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permezz kif ħafna mill-prerekwiżiti bħala I jistgħu,

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cross-għadd affarijiet għall gen ed jew qalba u simili.

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U mbagħad is-sena sophomore, għal xi raġuni, sibt il-

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nerv li pass marda fix-Xjenza Center B, fejn CS50 kien.

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A xjentist kompjuter famużi ħafna mill-isem ta 'Brian

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Kernighan kien tagħlim hawn dik is-sena.

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U anke dakinhar, I kien biss lest li attwalment jimlew

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Studju kard tiegħi billi din il-klassi suċċess / falliment.

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Fittixt madwar lili u I dehret kulħadd f'dan il-wieħed

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gotta taf mod aktar dwar ix-xjenza tal-kompjuter, dwar

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ipprogrammar, dwar il-kompjuters.

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Kulħadd wieħed għandu jkun programmazzjoni, f'din il-kamra,

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peress li kienu 12.

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Iżda, fil-fatt, dan ma kienx il-każ.

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U għalhekk il-ġurnata ħafna aħħar, it-Tnejn 5 ta 'l-semestru,

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ma Nieħu din qabża u l-bidla minn għadda / ma għaddiex għal

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grad ittra u spiċċa jinbidlu konċentrazzjoni tiegħi li

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istess jum għal xjenza tal-kompjuter.

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>> Issa, li mhux għan tagħna f'dan il-klassi, li jduru inti kollha

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fis-kompjuter xjenza konċentraturi, imma verament li

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jipproponi li hemm opportunità f'dan il-qasam u

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f'oqsma oħra li magħhom inti tista 'tkun pjuttost familjari

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peress li l-iskejjel għolja tipikament isegwu pjuttost

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triq kurrikulari standard, iżda li venture fil, fil CS50, fis

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ilmijiet ġodda.

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U jekk inti seduta hawn illum taħseb inti ma

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fil-fatt jappartjenu, hekk ukoll ħafna mill-poplu għal-lemin tiegħek u l-

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ix-xellug tiegħek.

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Tabilħaqq, is-sena, 76% ta 'l-istudenti f'din il-klassi ma kellhom ebda

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esperjenza preċedenti.

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Allura kuntrarjament għal dak li inti tista 'taħseb, ħafna mill-poplu

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seduta madwar hawn illum ma, fil-fatt, l-ebda minn qabel

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esperjenza.

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18% ħadu klassi waħda KEFA, u 6% ħadu tnejn jew aktar.

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Sadanittant, aħna nistaqsu-istudenti tagħna kull sena li jiddeskrivi

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ruħhom f'termini ta 'livell ta' kumdità.

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U hemm l-ebda definizzjoni waħda ta 'dan.

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Inti biss tip ta 'jafu li jekk int ma tantx

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komda fil CS50.

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U s-sena li għaddiet, kellna 55% f'dan il-porzjon pie aħdar hawn

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awto-jiddeskrivu bħala inqas komdi, l-istudenti li

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franchement ma kellhom ebda idea għaliex theyd anki shopped-kors fuq

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li l-ewwel jum.

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Iżda l-istess 55% baqgħu magħna sal-aħħar terminu, kif għamlet

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35% li kienu x'imkien bejn dawk aktar komdi

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u dawk inqas komdi.

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>> Allura, x'inhu x-xjenza tal-kompjuter?

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Ukoll fl-iskola għolja, u verament aktar ġenerali out

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hemm f'dawn il-jiem, hemm din il-perċezzjoni jew dan

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xjenza kunċett żbaljat tal-kompjuter li qed programmazzjoni.

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U li assolutament aspett wieħed ta 'xjenza tal-kompjuter.

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Iżda l-ipprogrammar, ikun x'ikun l-lingwa hija, huwa verament ftit

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għodda li x-xjenzati tal-kompjuter jużaw biex isolvu problemi, jew

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fil-qasam tax-xjenza tal-kompjuter jew aktar dawn

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jum fil-xjenzi fiżiċi, l-xjenzi naturali, b'mod

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mediċina, fil-istudji umanistiċi, li tanalizza settijiet kbar ta 'data.

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Kullimkien issa hemm kompjuter u d-dejta, hemm xi

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opportunità li japplikaw lezzjonijiet mitgħallma fi klassi bħal CS50.

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>> Mela ejja issolvi problema li xjenzat kompjuter jista 'jmur

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dwar soluzzjoni u tipprova tpoġġi xi lingwaġġ, jqajjem xi

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qafas konċettwali, madwar dak li jista 'inkella jkun hemm xi

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pjuttost astratt idea.

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Allura dan huwa telefon.

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Inti ma tara dawn l-affarijiet spiss wisq, għalkemm il-kulleġġ

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xorta jidher li dawn fil-djar u dormitorji.

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Iżda lura fil-ġurnata meta inti riedu li tuża t-telefon bħal

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dan, ma kien hemm ebda ktieb indirizz elettroniku

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fil cell phone tiegħek.

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Pjuttost, inti jinġibed up xi ħaġa

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magħrufa bħala ktieb tat-telefon.

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U dawn il-kotba tat-telefon kellhom madwar 1,000 paġna, tipikament.

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Huma kienu magħżula minn A sa Z. U inti kellu sempliċiment li ssib il-

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paġna dritt biex isibu l-persuna li qed tfittex sabiex

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isibu l-isem tagħhom u n-numru tat-telefon tagħhom.

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Issa kif taħseb li tmur dwar tfittex up

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xi ħadd f'dan il-ktieb?

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>> Ejja ngħidu l-għan tiegħi huwa li jagħti ħabib tiegħi, Mike Smith, sejħa.

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Ukoll, kif nista tmur dwar konstatazzjoni Mike Smith?

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Ukoll, approċċ raġonevoli ħafna, jekk naive u

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ineffiċjenti, ikun tibda hawn u tibda flipping biex

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paġna 4 sa paġna 5 sa paġna 6, u għall tip ta 'linearment, flimkien

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linja dritta, jgħaddu dan il-ktieb tat-telefon.

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U anki jekk huwa gonna jkun oerhört tedious, jekk Mike

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Smith huwa f'dan il-ktieb, jien eventwalment gonna tilħaq lilu

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meta I finalment flip għat-taqsima S ta 'dan il-ktieb.

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Issa naturalment, inti m'għandekx bżonn li jkun xjenzat kompjuter għall-

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taf li dan huwa mod stupid ta isolvi din il-problema.

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X'għandu bniedem tipiku huwa do?

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Isir ukoll.

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Allura inti flip għall-nofs, id-dritt.

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Allura youd flip madwar l-nofs, tfittex hawn, u I jidhru

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biex isibu myself fit-taqsima M.

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OK, so M huwa b'mod ċar mhux dak li jien tfittex.

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U Mike għad-dritt, biex ngħidu hekk, ta 'din it-taqsima.

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U kif xi wħud minnkom raw qabel, nistgħu litteralment issa

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tipproċedi biex tiċrita din il-problema fil nofs.

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>> [Applause]

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Int verament ma għandu jkun li impressjonat.

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Kissret l-isfel l-ħjata huwa attwalment mhux li diffiċli.

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Il-poplu reali tagħmel dan il-mod.

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Iżda, r-ħjata, issa għandna żewġ problemi, li kull wieħed

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li hija nofs kif kbar.

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U nistgħu litteralment tarmi li nofs il-problema bogħod.

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Issa aħna qed xellug ma l-paġni 1000 iżda, jgħidu, 500.

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Allura issa x'għandi nagħmel?

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Ukoll, bniedem tipiku se jmorru madwar fin-nofs mill-ġdid.

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U I find myself-sezzjoni R.

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Allura ma pjuttost hemm.

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Għalhekk għal darb'oħra, I jistgħu tiċrita din il-problema fil nofs.

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[Applause]

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Grazzi.

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Allura issa I biss ikollhom madwar 250 paġna.

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U nista 'tagħmel dan mill-ġdid u għal darb'oħra u għal darb'oħra u jmorru minn

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125 sa madwar 60 sa 30 biex 15 u ibqa 'sejjer hekk.

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U fl-aħħarnett, I ser tingħata fadal għal waħda mill-paġni S fuq

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li, jekk hu fil-ktieb tat-telefon, Mike Smith għandu jkun.

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>> Issa, li algoriżmu ovvjament pjuttost raġonevoli,

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u huwa algoritmu one-time-użu f'dan il-każ.

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Imma dak li nistgħu sort ta 'tieħu l bogħod minn dak?

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Ukoll, l-ewwel approċċ, jikkoreġu jekk naive għalkemm

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kien, tista 'tiġi deskritta minn din il-linja dritta.

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Mela jekk fuq l-assi x here we jgħidu dan huwa d-daqs ta 'l-

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problema, sabiex l-assi x tmur lejn il-lemin, il-

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problema tkompli tikber.

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Xi jfisser li tkun akbar fil-

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kuntest ta 'din il-problema?

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Paġni aktar fil-ktieb tat-telefon.

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Hemm xi ħaġa aktar li nistgħu tikkwantifika.

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Fuq il-y-axis, il-ħin biex issolvi.

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Hekk kif l-assi tmur up, preżumibbilment jieħu aktar ħin.

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Allura li l-approċċ l-ewwel lineari tiftix mill-paġna 1

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li dot dot dot paġna 1000 hija proċedura lineari, lineari

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algoritmu jew proċess.

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U aħna jistgħu jiddeskrivu lilha minn dan f'linja dritta.

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Jekk I żid paġna waħda aktar għall-ktieb tat-telefon, li għaddej biex, fl-

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l-agħar każ, tieħu me wieħed flip paġna aktar

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biex isibu Mike Smith.

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Jekk I żid 100 paġna, 100 aktar Flips jew unitajiet ta 'ħin.

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>> Issa, I jista 'jkun ftit għaqlija ma' dan.

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I m'għandhomx bżonn biex verament jduru paġna waħda f'ħin wieħed.

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I tista 'tagħmel affarijiet simili 2 fi żmien jew 4 fi żmien.

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Iżda anke li mhux kollha li fundamentalment aħjar.

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Anki jekk huwa 2 fi żmien, yeah, li tip ta 'jiċċaqlaq dan

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linja stabbiliti daqsxejn, u dan ifisser li dan jieħu inqas ħin mogħti

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l-istess numru ta 'paġni.

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Imma din mhix fundamentalment aħjar.

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Imma dak li ma aħna biss tagħmel, u dak li ma kollu inti tagħmel

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istintivament?

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Inti fil-fatt jinkiseb ftit xi ħaġa bħal din,

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ħin logaritmika, fejn il-problema tista 'tikber u tikber u

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jikbru iżda l-ispiża ta 'soluzzjoni ta din il-problema, il-ħin

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meħtieġa biex isolvu din il-problema, ma

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jikber kważi malajr.

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Dan ikun kurva logaritmika, log tat n, fejn n hija

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biss id-daqs tal-problema, in-numru ta 'paġni f'dan

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ktieb tat-telefon.

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U dak li jfisser dan f'termini reali?

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Ukoll, jekk ikollna simili 500 ruħ f'dan il-kamra dritt issa,

186
00:13:00,500 --> 00:13:02,330
jew pjuttost, jekk ikollna -

187
00:13:02,330 --> 00:13:05,520
metafora taħlit, ma tagħmel dan leżempju s'issa din is-sena -

188
00:13:05,520 --> 00:13:08,900
hekk jekk għandna 500 paġni fil-ktieb tat-telefon u aħna doppju li

189
00:13:08,900 --> 00:13:12,660
1000, f'dan il-mudell aktar intelliġenti ta 'flipping

190
00:13:12,660 --> 00:13:15,370
għall-nofs, kemm tiċrit paġna aktar ma jieħdu biex tmur

191
00:13:15,370 --> 00:13:17,390
minn 500 paġna sa 1,000?

192
00:13:17,390 --> 00:13:19,510
Ukoll, wieħed biss dmugħ paġna addizzjonali.

193
00:13:19,510 --> 00:13:22,440
Jekk inti mogħtija lili ktieb tat-telefon 2000 paġna, no big deal.

194
00:13:22,440 --> 00:13:25,070
I biss tiċrita hija waħda ħin addizzjonali.

195
00:13:25,070 --> 00:13:28,860
>> Hekk fil-qosor, id-daqs tal-problema tista 'tikber ħafna aktar mgħaġġla

196
00:13:28,860 --> 00:13:30,650
mill-ispiża li attwalment jissolvew.

197
00:13:30,650 --> 00:13:32,890
Issa dan huwa biss wieħed algoritmu bħal dawn.

198
00:13:32,890 --> 00:13:35,480
Hemm oħrajn li nistgħu issolvi bl-istess mod.

199
00:13:35,480 --> 00:13:36,630
U hekk għaliex ma nagħmlu dan?

200
00:13:36,630 --> 00:13:39,650
Jekk inti Humer lili, għalkemm awkwardly hawn Sanders, mur

201
00:13:39,650 --> 00:13:42,950
quddiem, kulħadd, jekk inti tista 'u stand up fil-post.

202
00:13:46,420 --> 00:13:49,040
Kif tara fuq l-iskrin hawn, dan huwa algoritmu, a

203
00:13:49,040 --> 00:13:52,110
proċess, programm tal-kompjuter jekk inti se, li jiġi eżegwit minn

204
00:13:52,110 --> 00:13:53,850
bnedmin li għandha biss 3 passi.

205
00:13:53,850 --> 00:13:55,010
Aħna diġà fuq pass 1.

206
00:13:55,010 --> 00:13:55,840
You ħadthom saqajh.

207
00:13:55,840 --> 00:13:58,120
U issa taħseb li yourself in-numru 1.

208
00:13:58,120 --> 00:13:59,310
Dan huwa numru attwali tiegħek.

209
00:13:59,310 --> 00:14:00,990
Kulħadd hawnhekk huwa numru 1.

210
00:14:00,990 --> 00:14:04,360
Pass 2, par off ma 'xi ħadd permanenti, żid in-numri tiegħek

211
00:14:04,360 --> 00:14:07,155
flimkien, u mbagħad jadotta s-somma bħala numru ġdida tiegħek.

212
00:14:15,760 --> 00:14:18,730
Wieħed mill inti għandek joqogħdu bilqegħda, imbagħad irrepeti.

213
00:14:29,260 --> 00:14:33,715
>> SPEAKER 1: 205.

214
00:14:33,715 --> 00:14:34,210
DAVID J. Malan: X'hemm li?

215
00:14:34,210 --> 00:14:35,200
SPEAKER 1: 205.

216
00:14:35,200 --> 00:14:36,450
DAVID J. Malan: OK.

217
00:14:43,120 --> 00:14:44,605
SPEAKER 2: Huwa għandu l-oħrajn.

218
00:14:58,120 --> 00:14:58,780
DAVID J. Malan: 205?

219
00:14:58,780 --> 00:14:59,666
SPEAKER 3: Yeah.

220
00:14:59,666 --> 00:15:00,092
DAVID J. Malan: OK.

221
00:15:00,092 --> 00:15:00,518
3.

222
00:15:00,518 --> 00:15:02,040
SPEAKER 4: 400.

223
00:15:02,040 --> 00:15:02,350
SPEAKER 5: 5.

224
00:15:02,350 --> 00:15:04,640
700.

225
00:15:04,640 --> 00:15:05,890
DAVID J. Malan: Kull dritt.

226
00:15:09,110 --> 00:15:11,965
Fuq dan il-punt, anqas u anqas nies għandhom ikunu bil-wieqfa.

227
00:15:14,690 --> 00:15:17,860
Dan huwa fejn jiġrilha aktar strambi.

228
00:15:17,860 --> 00:15:18,660
Xi ħadd hawnhekk.

229
00:15:18,660 --> 00:15:19,910
Hawnhekk.

230
00:15:28,490 --> 00:15:31,170
Il-parti agħar huwa inti ukoll għandek ħafna verbalment tagħmel

231
00:15:31,170 --> 00:15:33,830
aritmetika quddiem mijiet ta 'Harvard

232
00:15:33,830 --> 00:15:35,080
undergrads.

233
00:15:40,790 --> 00:15:41,820
OK.

234
00:15:41,820 --> 00:15:43,140
Daqsxejn ta 'bug hawn.

235
00:15:43,140 --> 00:15:43,490
Okay.

236
00:15:43,490 --> 00:15:44,490
X'hemm numru tiegħek?

237
00:15:44,490 --> 00:15:45,390
SPEAKER 6: Disa.

238
00:15:45,390 --> 00:15:45,815
DAVID J. Malan: X'hemm li?

239
00:15:45,815 --> 00:15:46,330
SPEAKER 6: Disa.

240
00:15:46,330 --> 00:15:47,040
DAVID J. Malan: Disa.

241
00:15:47,040 --> 00:15:49,740
Okay.

242
00:15:49,740 --> 00:15:52,388
X'hemm numru tiegħek?

243
00:15:52,388 --> 00:15:53,780
SPEAKER 7: 179.

244
00:15:53,780 --> 00:15:55,570
DAVID J. Malan: 179?

245
00:15:55,570 --> 00:15:56,330
Okay.

246
00:15:56,330 --> 00:15:56,470
Tajba.

247
00:15:56,470 --> 00:15:57,280
Allura 188.

248
00:15:57,280 --> 00:15:58,430
Allura inti guys tista joqogħdu bilqegħda.

249
00:15:58,430 --> 00:15:59,090
X'hemm numru tiegħek?

250
00:15:59,090 --> 00:16:00,090
SPEAKER 8: 118.

251
00:16:00,090 --> 00:16:02,260
DAVID J. Malan: 118.

252
00:16:02,260 --> 00:16:05,310
Xi Undergrad intelliġenti jibdew jagħmlu l-matematika.

253
00:16:05,310 --> 00:16:05,590
Okay.

254
00:16:05,590 --> 00:16:07,050
118, 188.

255
00:16:07,050 --> 00:16:10,022
X'iktar do sirna?

256
00:16:10,022 --> 00:16:10,990
SPEAKER 9: 71.

257
00:16:10,990 --> 00:16:13,884
DAVID J. Malan: 71.

258
00:16:13,884 --> 00:16:14,310
SPEAKER 10: 79.

259
00:16:14,310 --> 00:16:15,510
DAVID J. Malan: 79.

260
00:16:15,510 --> 00:16:17,100
Okay.

261
00:16:17,100 --> 00:16:18,080
SPEAKER 11: 47.

262
00:16:18,080 --> 00:16:19,100
DAVID J. Malan: 47.

263
00:16:19,100 --> 00:16:21,100
Li, l-għalliema, li jagħtina kemm?

264
00:16:24,100 --> 00:16:27,690
705 hija t-tweġiba.

265
00:16:27,690 --> 00:16:29,905
U li, fil-fatt, eżattament korrett.

266
00:16:35,060 --> 00:16:36,970
Le, aħna kienu attwalment ftit off hemmhekk.

267
00:16:36,970 --> 00:16:40,435
>> Imma dan kif għandu ħadmu?

268
00:16:40,435 --> 00:16:41,940
X'għandu jkun ġara biss?

269
00:16:41,940 --> 00:16:45,560
Allura, fuq kull iterazzjoni ta 'dan algoritmu, bdejna bil

270
00:16:45,560 --> 00:16:48,000
xi numru ta 'nies bil-wieqfa, u li kien l-

271
00:16:48,000 --> 00:16:49,350
n totali għadd fl-ewwel.

272
00:16:49,350 --> 00:16:51,750
Imbagħad nofs inti sib stabbiliti, u aħna marru għal n aktar minn 2.

273
00:16:51,750 --> 00:16:52,830
Imbagħad nofs inti sib stabbiliti.

274
00:16:52,830 --> 00:16:56,310
Aħna marru għall n aktar minn 4, n aktar minn 8, n aktar minn 16, u oħrajn,

275
00:16:56,310 --> 00:16:59,080
sakemm, anki jekk it-tip ta ddiżintegrat hemm fil-

276
00:16:59,080 --> 00:17:02,000
il-għan, fit-teorija, kien kulħadd paired off fil gallarija u

277
00:17:02,000 --> 00:17:05,780
mezzanin u orkestra hawn, kien ikollna biss wieħed isolati

278
00:17:05,780 --> 00:17:11,790
persuna wieqfa b'valur totali, f'dan il-każ, ta '705.

279
00:17:11,790 --> 00:17:14,460
Issa, dak ma jfisser, għalkemm, għall-running time?

280
00:17:14,460 --> 00:17:16,829
Ukoll jaħsbu dwar jekk I bħala l-bniedem kellu jsir dan manwalment.

281
00:17:16,829 --> 00:17:19,819
Nixtieq bdew pjuttost naively iżda b'mod korrett ma '1,

282
00:17:19,819 --> 00:17:23,740
2, 3, 4, 5, 6, 7, 8, u oħrajn.

283
00:17:23,740 --> 00:17:24,920
Jieħu żmien pjuttost twil.

284
00:17:24,920 --> 00:17:25,980
So I tista 'tagħmel aħjar, id-dritt?

285
00:17:25,980 --> 00:17:27,690
Fl-iskola grad, inti mhux biss jgħodd dawk.

286
00:17:27,690 --> 00:17:28,109
Inti jgħodd twos.

287
00:17:28,109 --> 00:17:30,050
Allura 2, 4, 6, 8, 10, 12.

288
00:17:30,050 --> 00:17:31,630
U li gets ħafna aktar mgħaġġla.

289
00:17:31,630 --> 00:17:34,620
Imma issa fundamentalment, billi jwieżen l-kollettiv

290
00:17:34,620 --> 00:17:37,070
intelliġenza ta 'kulħadd f'din il-kamra, nistgħu niksbu

291
00:17:37,070 --> 00:17:40,660
jitrażżnu ħafna aktar bħal dan, fejn issa l-għadd ta 'l-

292
00:17:40,660 --> 00:17:42,450
nies f'dan kamra jista 'jirdoppja.

293
00:17:42,450 --> 00:17:45,940
Ieħor nies 700 jimxu fil din il-kamra għall-1400 in-nies,

294
00:17:45,940 --> 00:17:49,680
iżda se jieħu biss minna iterazzjoni waħda aktar ta 'dan

295
00:17:49,680 --> 00:17:50,880
algoritmu biex isolvu.

296
00:17:50,880 --> 00:17:53,170
>> U għalhekk, dejjem dawn il-jiem, meta jkollna dawn enormi

297
00:17:53,170 --> 00:17:55,860
settijiet ta 'data fil-Facebook u Google u simili, huwa

298
00:17:55,860 --> 00:17:58,710
soluzzjoni ta 'problemi bil-ftit ta' għarfien, din id-daqsxejn ta '

299
00:17:58,710 --> 00:18:02,280
cleverness, li l-jħallina naqtgħu dejjem aktar li jagħmlu ħafna, ħafna

300
00:18:02,280 --> 00:18:05,150
affarijiet aktar qawwija ma 'kompjuters llum.

301
00:18:05,150 --> 00:18:07,340
Jekk inti tixtieq dawn it-tipi ta 'affarijiet, inti tista raw fuq

302
00:18:07,340 --> 00:18:10,650
Jum Facebook CS50 s Puzzle stess ġejjin up din is-Sibt.

303
00:18:10,650 --> 00:18:12,580
Jekk inti tixtieq li tipparteċipa fil xi ħaġa simili

304
00:18:12,580 --> 00:18:17,010
dan fejn inti, fi 2 jew 3 jew 4 timijiet ta '4, jixtieq

305
00:18:17,010 --> 00:18:20,820
isolvu xi puzzles bħal dan wieħed, għandek ċans

306
00:18:20,820 --> 00:18:23,510
biex tirbaħ xi premjijiet fabulous, fosthom huwa Wii u xi

307
00:18:23,510 --> 00:18:25,900
rigal karti jew xi swag Facebook oħra.

308
00:18:25,900 --> 00:18:28,660
Dan Sibt, nofsinhar sa 3:00, mur

309
00:18:28,660 --> 00:18:33,440
cs50.net/rsvp għal tali.

310
00:18:33,440 --> 00:18:35,940
U dan slide hija online jekk inti tixtieq li play madwar.

311
00:18:35,940 --> 00:18:38,010
Il-problemi din is-sena għandhom ikunu ġodda.

312
00:18:38,010 --> 00:18:40,210
>> Tista 'tinnota fil-klassi, ukoll, l-aktar

313
00:18:40,210 --> 00:18:41,210
kameras din is-sena.

314
00:18:41,210 --> 00:18:45,180
Allura mhux biss se-kors ikun iffilmjati fil-mod tas-soltu, CS50

315
00:18:45,180 --> 00:18:47,760
tista 'wkoll tkun qed tieħu sehem fil dokumentarju fuq ogħla

316
00:18:47,760 --> 00:18:50,370
edukazzjoni li s tħares lejn l-esperjenza trasformattiv

317
00:18:50,370 --> 00:18:53,000
li student jista 'jkollhom dawn il-jiem fil-undergraduate

318
00:18:53,000 --> 00:18:53,870
kors ta 'studju.

319
00:18:53,870 --> 00:18:56,990
Allura lejn dawn, allura, mhux biss se nkunu iffilmjar għal

320
00:18:56,990 --> 00:19:00,170
dan, aħna se iffilmjar kif ukoll għall dejjem tagħna

321
00:19:00,170 --> 00:19:03,670
udjenza online, kif ukoll fuq l-okkażjoni din l-udjenza hawn.

322
00:19:03,670 --> 00:19:05,880
Allura aħna nilqgħu għall-klassi din is-sena Harvard tagħna

323
00:19:05,880 --> 00:19:08,190
Iskola istudenti Estensjoni, Iskola tal-Gradwati ta 'Disinn,

324
00:19:08,190 --> 00:19:10,470
Edukazzjoni, l-iskola tan-negozju, l-Iskola Kennedy,

325
00:19:10,470 --> 00:19:12,970
l-iskola liġi, kif ukoll numru ta 'studenti mill-

326
00:19:12,970 --> 00:19:16,140
Belmont, Lexington, Newton, u l-iskejjel WATERTOWN għolja.

327
00:19:16,140 --> 00:19:17,120
Merħba lilkom ilkoll.

328
00:19:17,120 --> 00:19:20,070
Barra minn hekk din is-sena, jista 'jkollok jinstemgħu, Harvard u MIT,

329
00:19:20,070 --> 00:19:22,500
u Berkeley issa, daħlu fi kollaborattiv

330
00:19:22,500 --> 00:19:26,020
sħubija, inizjattiva msejħa EDX, li hija

331
00:19:26,020 --> 00:19:28,650
inizjattiva biex jiftħu l-edukazzjoni għal kulħadd l-aktar

332
00:19:28,650 --> 00:19:31,210
nies online u fundamentalment jibdew jagħmlu

333
00:19:31,210 --> 00:19:34,400
riċerka fuq skala ferm usa 'kif in-nies jitgħallmu.

334
00:19:34,400 --> 00:19:36,920
U hekk CS50 se tkun l-ewwel kors tal-kulleġġ tal-

335
00:19:36,920 --> 00:19:38,790
jipparteċipaw f'dik l-inizjattiva kif ukoll.

336
00:19:38,790 --> 00:19:41,320
Li jfisser li inti ser ikollok aċċess għall-għodod aktar,

337
00:19:41,320 --> 00:19:44,020
l-kontenut kollu aktar kurrikulari, l-aktar video

338
00:19:44,020 --> 00:19:48,190
kontenut bħala riżultat, kif ukoll, mill-bieraħ filgħodu, il-

339
00:19:48,190 --> 00:19:52,210
53019 persuni li rreġistraw biex jieħdu CS50 flimkien

340
00:19:52,210 --> 00:19:55,290
miegħek din is-sena fuq l-Internet.

341
00:19:55,290 --> 00:19:56,530
Allura mingħajr -

342
00:19:56,530 --> 00:20:03,800
[Applause]

343
00:20:03,800 --> 00:20:05,680
Allura dak li dan ifisser, b'mod partikolari, huwa li l-

344
00:20:05,680 --> 00:20:07,770
għalliema u I jkunu qattgħu pjuttost ftit ta 'żmien dan

345
00:20:07,770 --> 00:20:10,600
sajf tħejjija għall-waqgħa, kemm fuq il-kampus u off, so

346
00:20:10,600 --> 00:20:13,580
li nistgħu jibdew jibnu corpus ta 'interessanti, ta

347
00:20:13,580 --> 00:20:16,130
konvinċenti, ta 'l-involviment kontenut edukattiv li

348
00:20:16,130 --> 00:20:22,490
tiffoka, b'mod partikolari, fuq mezzi tal-ġarr aktar intimi ta '

349
00:20:22,490 --> 00:20:23,960
pjuttost kumplessa materjal.

350
00:20:23,960 --> 00:20:26,210
>> Allura minbarra l-lectures tal-kors u l-sezzjonijiet u

351
00:20:26,210 --> 00:20:28,300
affarijiet imsejħa walkthroughs, li aħna ser tirrevedi fi ftit

352
00:20:28,300 --> 00:20:31,620
bit, aħna ser jkollhom ukoll dawn xorts din is-sena li jippermettu

353
00:20:31,620 --> 00:20:33,570
inti biex jimpenjaw ruħhom mal-kors minn angolu differenti

354
00:20:33,570 --> 00:20:34,520
għal kollox.

355
00:20:34,520 --> 00:20:36,540
Mela ejja jużaw dan bħala opportunità biex tieħu quick

356
00:20:36,540 --> 00:20:38,905
Peek lejn wieħed li tiddiskuti dan il-kunċett ta 'binaries.

357
00:20:38,905 --> 00:20:42,220
>> Allura fix-xjenza tal-kompjuter, hemm affarijiet msejħa algoritmi -

358
00:20:42,220 --> 00:20:44,610
tnejn li aħna biss ħa ħarsa lejn - dawn il-proċeduri għall-

359
00:20:44,610 --> 00:20:45,690
soluzzjoni ta 'problemi.

360
00:20:45,690 --> 00:20:46,770
Iżda fl-aħħar tal-ġurnata, għandek bżonn li

361
00:20:46,770 --> 00:20:48,730
jirrappreżentaw l-informazzjoni b'xi.

362
00:20:48,730 --> 00:20:51,640
U inti għandek bżonn biex jirrappreżentawha b'mod li l-kompjuter jista '

363
00:20:51,640 --> 00:20:52,400
jifhmu.

364
00:20:52,400 --> 00:20:54,940
U anki jekk inti ma verament jifhem kompjuters u

365
00:20:54,940 --> 00:20:58,150
int f'dik% 76 dritt issa, inti probabilment jkollhom xi vaga

366
00:20:58,150 --> 00:21:01,860
sens li l-kompjuters b'xi jittrattaw 0s u 1s, il-binarju

367
00:21:01,860 --> 00:21:03,160
sistema, biex ngħidu hekk.

368
00:21:03,160 --> 00:21:04,480
Issa għaliex huwa li l-każ?

369
00:21:04,480 --> 00:21:07,060
Ukoll, jirriżulta meta l-kompjuters ewwel daħal dwar, jekk

370
00:21:07,060 --> 00:21:09,400
inti meħtieġ biex jirrappreżentaw l-informazzjoni, inti tista 'tagħmel dan

371
00:21:09,400 --> 00:21:10,600
bl-elettriku.

372
00:21:10,600 --> 00:21:13,460
U għalkemm dan huwa daqsxejn ta oversimplification, ħafna

373
00:21:13,460 --> 00:21:16,190
mod faċli ta 'reġistrazzjoni ta' informazzjoni huwa jew billi

374
00:21:16,190 --> 00:21:18,000
tidwir li l-elettriku fuq -

375
00:21:18,000 --> 00:21:20,460
ta '1 fil-binarju, biex ngħidu hekk - jew tidwir

376
00:21:20,460 --> 00:21:22,100
li l-elettriku off.

377
00:21:22,100 --> 00:21:24,080
>> Għalhekk, jekk Barry, jekk inti ma mind, jistgħu aħna dim-dwal

378
00:21:24,080 --> 00:21:26,000
kompletament għal ftit mument?

379
00:21:26,000 --> 00:21:29,730
Dan hawnhekk huwa ta '0 binarja ħafna gratwita.

380
00:21:29,730 --> 00:21:33,830
Jekk ngħaddu l-dwal back-up, issa Sanders Teatru huwa

381
00:21:33,830 --> 00:21:35,860
li jirrappreżenta l-valur binarju ta '1.

382
00:21:35,860 --> 00:21:38,710
Sfortunatament, b'sett wieħed biss bit, biss sett wieħed ta '

383
00:21:38,710 --> 00:21:41,070
dwal, nistgħu biss jirrappreżentaw żewġ numri fil-

384
00:21:41,070 --> 00:21:42,690
dinja, 0 u 1.

385
00:21:42,690 --> 00:21:44,470
U d jkun sbieħ jekk il-kompjuters setgħu jistrieħu a

386
00:21:44,470 --> 00:21:45,340
kemmxejn ogħla minn dak.

387
00:21:45,340 --> 00:21:46,370
Imma fil-fatt jistgħu.

388
00:21:46,370 --> 00:21:49,230
So let me pull up fuq l-iskrin here ħabib Nate tagħna Hardison

389
00:21:49,230 --> 00:21:52,000
li se tagħtina ħarsa matul il-kors ta 'ftit ftit

390
00:21:52,000 --> 00:21:54,680
minuta f'din kunċett ta binarja.

391
00:21:54,680 --> 00:22:01,870
>> [Daqq ta 'video]

392
00:22:01,870 --> 00:22:03,450
Nate HARDISON: Back meta inti tgħallimt kif jaqraw u jiktbu

393
00:22:03,450 --> 00:22:08,450
numri, inti tgħallmu dwar l-ċifri 0-9.

394
00:22:08,450 --> 00:22:10,840
Biex tikteb numri sħaħ ikbar minn 9, li tgħallimt li kollha

395
00:22:10,840 --> 00:22:13,830
inti kellha tagħmel kien jużaw xi kombinazzjoni ta 'dawn numri,

396
00:22:13,830 --> 00:22:21,000
bħal fil 52 u 437.

397
00:22:21,000 --> 00:22:23,220
Għalhekk, dan il-mod ta 'numri bil-miktub għandha

398
00:22:23,220 --> 00:22:25,620
, l-isem deċimali notazzjoni.

399
00:22:25,620 --> 00:22:26,690
Għaliex deċimali?

400
00:22:26,690 --> 00:22:30,340
Ukoll, l-għerq Latin ta 'deċimali, Diċ, tfisser 10.

401
00:22:30,340 --> 00:22:33,190
U meta jkollok 10 numri fis-sistema notazzjoni tiegħek, 10

402
00:22:33,190 --> 00:22:35,290
isir għadd pjuttost speċjali.

403
00:22:35,290 --> 00:22:38,950
Ejja nħarsu lejn in-numru 437 miktub fl-notazzjoni deċimali li

404
00:22:38,950 --> 00:22:40,340
jifhmu għaliex.

405
00:22:40,340 --> 00:22:50,200
>> Nistgħu 1 ikissru 437 fis 400 flimkien ma '30 plus 7.

406
00:22:50,200 --> 00:22:56,050
Aħna tista 'tieħu apparti aktar u aktar li konna ltqajna 4 darbiet 100

407
00:22:56,050 --> 00:23:02,990
plus 3 darbiet 10 plus 7 darbiet 1.

408
00:23:02,990 --> 00:23:05,970
Ftakar tagħlim dwar il-post dawk, il-post għexieren,

409
00:23:05,970 --> 00:23:08,050
il-post mijiet, u l-bqija?

410
00:23:08,050 --> 00:23:10,990
Dan huwa eżattament fejn li tiġi minn.

411
00:23:10,990 --> 00:23:14,150
U fl-aħħarnett, nistgħu naraw konna ltqajna mazz ta 'setgħat ta' 10

412
00:23:14,150 --> 00:23:15,770
integrati fil hawn.

413
00:23:15,770 --> 00:23:25,330
Imxejna ltqajna 4 darbiet 10 għall-2 flimkien ma '3 darbiet 10 għall-1 flimkien ma'

414
00:23:25,330 --> 00:23:29,580
7 darbiet 10 sa l-0.

415
00:23:29,580 --> 00:23:31,330
Allura issa tara għaliex 10 huwa speċjali

416
00:23:31,330 --> 00:23:33,240
numru ta 'notazzjoni deċimali.

417
00:23:33,240 --> 00:23:35,240
Fil-fatt, konna ltqajna l-isem għal dan.

418
00:23:35,240 --> 00:23:38,170
Huwa sejjaħ il-bażi peress li huwa l-bażi ta 'l-esponent

419
00:23:38,170 --> 00:23:39,960
fil-aritmetika tagħna hawn.

420
00:23:39,960 --> 00:23:43,190
>> Notazzjoni deċimali mhix l-uniku mod biex jirrappreżentaw numri.

421
00:23:43,190 --> 00:23:48,020
Fil-fatt, anke jekk aħna jeħles mill-numri 2 sa 9, nistgħu

422
00:23:48,020 --> 00:23:49,610
għadhom jirrappreżentaw kollha tan-numri li

423
00:23:49,610 --> 00:23:51,620
nistgħu ma deċimali.

424
00:23:51,620 --> 00:23:56,220
Allura issa għandna żewġ ċifri, 0 u 1, 2 huwa speċjali tagħna

425
00:23:56,220 --> 00:23:59,070
numru, il-bażi ta 'sistema notazzjoni tagħna.

426
00:23:59,070 --> 00:24:02,340
L-isem ta 'din is-sistema notazzjoni tissejjaħ binarja minħabba li

427
00:24:02,340 --> 00:24:04,890
il-prefiss "bi" ifisser 2.

428
00:24:04,890 --> 00:24:08,130
Allura minflok issa li jkollhom post dawk u għexieren post u

429
00:24:08,130 --> 00:24:11,950
hekk, issa għandna post dawk, post twos, a fours

430
00:24:11,950 --> 00:24:15,420
post, u l-bqija, li jmorru minn poteri ta '2.

431
00:24:15,420 --> 00:24:17,320
Mela ejja ara dan billi tagħmel xi għadd.

432
00:24:17,320 --> 00:24:22,790
Għalhekk, 0 għadu 0, u 1 għadu 1.

433
00:24:22,790 --> 00:24:25,700
Madankollu, issa li konna ltqajna post twos minflok l-għexieren

434
00:24:25,700 --> 00:24:31,070
post, 10 jirrappreżenta n-numru 2.

435
00:24:31,070 --> 00:24:36,240
Biex tikseb 3, aħna żid għal dak u jiksbu 11.

436
00:24:36,240 --> 00:24:38,310
4, peress li hemm issa post fours, huwa

437
00:24:38,310 --> 00:24:42,520
rappreżentat minn 100.

438
00:24:42,520 --> 00:24:47,280
Ħames huwa 101.

439
00:24:47,280 --> 00:24:50,610
6 huwa 110.

440
00:24:50,610 --> 00:24:54,470
7 huwa 111.

441
00:24:54,470 --> 00:24:56,330
8, għal darb'oħra, għandu l-post tiegħu stess.

442
00:24:56,330 --> 00:25:00,650
Allura huwa 1000.

443
00:25:00,650 --> 00:25:01,750
U naħseb ikollok il-punt.

444
00:25:01,750 --> 00:25:03,510
[END video daqq]

445
00:25:03,510 --> 00:25:06,900
>> DAVID J. Malan: Allura, dan huwa li jgħidu, dak li kompjuters do u

446
00:25:06,900 --> 00:25:09,650
dak li hu binarja huwa attwalment mhux li differenti minn dak

447
00:25:09,650 --> 00:25:12,260
aħna kont qed tieħu għall mogħtija għal xi snin, id-dritt?

448
00:25:12,260 --> 00:25:14,330
You Ikkalkola iskola grad, inti tgħallmu jgħodd preċiżament

449
00:25:14,330 --> 00:25:16,310
il-moda li Nate propost.

450
00:25:16,310 --> 00:25:18,250
Imma inti probabilment ma verament ħsibt dwar dan peress li,

451
00:25:18,250 --> 00:25:19,990
il-fatt li hemm dan il-post dawk, għexieren post, u

452
00:25:19,990 --> 00:25:20,490
mijiet post.

453
00:25:20,490 --> 00:25:21,185
U li pretty arbitrarja.

454
00:25:21,185 --> 00:25:24,090
U fil-fatt, il-kompjuters sempliċement jużaw din il-bażi differenti.

455
00:25:24,090 --> 00:25:27,430
Iżda fl-aħħar tal-ġurnata, li attwalment fiżikament jirrappreżentaw

456
00:25:27,430 --> 00:25:30,100
dan il-kunċett ta '0 u 1, inti ovvjament ma biss dawwar il-

457
00:25:30,100 --> 00:25:31,630
dwal fuq u barra neċessarjament.

458
00:25:31,630 --> 00:25:33,960
Ikollok bżonn tagħmel dan fuq ħafna ifjen-grained skala.

459
00:25:33,960 --> 00:25:36,240
U billi ifjen tal-qamħa medja, inti tista tiftakar din il iblah

460
00:25:36,240 --> 00:25:38,990
ġugarell ftit mill-tfulija Willy sufi u dawn ftit

461
00:25:38,990 --> 00:25:40,360
partiċelli manjetiċi.

462
00:25:40,360 --> 00:25:43,830
>> Partiċelli Allura manjetiċi huma xi ħaġa li inti tista 'tallinja

463
00:25:43,830 --> 00:25:45,720
fi ftit ta 'direzzjonijiet differenti, forsi

464
00:25:45,720 --> 00:25:47,780
tramuntana-nofsinhar jew nofsinhar-tramuntana.

465
00:25:47,780 --> 00:25:50,340
U għalhekk ħafna ta 'incarnations fiżiċi ta' teknoloġija

466
00:25:50,340 --> 00:25:53,410
dawn il-jiem li jużaw binarju, li jużaw 0s u 1s, sempliċiment

467
00:25:53,410 --> 00:25:58,190
jkollhom magnetism fuq ġewwa li tallinja l-affarijiet, up-isfel jew

468
00:25:58,190 --> 00:26:01,970
isfel għal fuq, bi b'hekk jirrappreżentaw 0 jew 1,

469
00:26:01,970 --> 00:26:02,750
rispettivament.

470
00:26:02,750 --> 00:26:05,360
Allura fil-fatt, ejja jimxu l bogħod mill-astratt hawn u

471
00:26:05,360 --> 00:26:07,580
tħares lejn il-ġewwa ta x'hemm aktar tradizzjonali

472
00:26:07,580 --> 00:26:08,640
hard drive tal-kompjuter.

473
00:26:08,640 --> 00:26:10,980
Dan wieħed jiġri li jkun daqsxejn akbar fuq l-iskrin fil-li huwa

474
00:26:10,980 --> 00:26:12,420
minn kompjuter desktop.

475
00:26:12,420 --> 00:26:15,670
Imma laptops llum għad għandhom l-istess teknoloġija, iżda hija

476
00:26:15,670 --> 00:26:18,190
gradwalment jiġu mibdula mill-affarijiet aktar sofistikati li

477
00:26:18,190 --> 00:26:20,490
jkollhom fil-fatt l-ebda partijiet li jiċċaqalqu.

478
00:26:20,490 --> 00:26:22,440
Il ġewwa, imbagħad, ta 'hard drive.

479
00:26:22,440 --> 00:26:23,610
>> [Daqq ta 'video]

480
00:26:23,610 --> 00:26:26,320
SPEAKER 12: Il-hard drive hija fejn PC tiegħek ħwienet aktar ta '

481
00:26:26,320 --> 00:26:27,870
data permanenti tagħha.

482
00:26:27,870 --> 00:26:31,600
Biex tagħmel dan, l-informazzjoni jivvjaġġa minn RAM flimkien ma 'softwer

483
00:26:31,600 --> 00:26:35,290
sinjali li tgħid l-hard drive kif taħżen dik id-data.

484
00:26:35,290 --> 00:26:38,000
Iċ-ċirkwiti hard drive tittraduċi dawk is-sinjali fi

485
00:26:38,000 --> 00:26:40,130
fluttwazzjonijiet fil-vultaġġ.

486
00:26:40,130 --> 00:26:43,700
Dawn imbagħad jikkontrollaw partijiet li jiċċaqilqu tal-hard drive, li wħud

487
00:26:43,700 --> 00:26:46,750
il-partijiet li jiċċaqalqu ftit ħalla fil-kompjuter moderni.

488
00:26:46,750 --> 00:26:49,460
Uħud mill-sinjali tikkontrolla bil-mutur li spins

489
00:26:49,460 --> 00:26:51,300
metall miksija platters.

490
00:26:51,300 --> 00:26:54,670
Id-data tiegħek huwa attwalment maħżuna fuq dawn platters.

491
00:26:54,670 --> 00:26:57,810
Sinjali oħra jċaqalqu l-ras read-write li jaqra jew

492
00:26:57,810 --> 00:26:59,900
jikteb data dwar il-platters.

493
00:26:59,900 --> 00:27:03,520
Din il-magna hija tant preċiżi li xagħar uman ma setgħux

494
00:27:03,520 --> 00:27:06,470
anki jgħaddu bejn il-kapijiet u platti għażil.

495
00:27:06,470 --> 00:27:08,780
Madankollu dan kollu jaħdem f'veloċitajiet terrific.

496
00:27:08,780 --> 00:27:09,520
[END video daqq]

497
00:27:09,520 --> 00:27:11,410
>> DAVID J. Malan: Allura, jekk aħna issa zoom fl fuq x'hemm attwalment

498
00:27:11,410 --> 00:27:14,300
jiġri fuq quċċata ta 'dawn platti f'termini tal-

499
00:27:14,300 --> 00:27:17,470
magnetism, aħna għandna dan it-tieni ta 'żewġ jistenna.

500
00:27:17,470 --> 00:27:17,755
>> [Daqq ta 'video]

501
00:27:17,755 --> 00:27:20,820
SPEAKER 13: Ejja nħarsu lejn dak li aħna biss raw fil-mozzjoni bil-mod.

502
00:27:20,820 --> 00:27:23,300
Meta polz qasira ta 'l-elettriku huwa mibgħut lill-

503
00:27:23,300 --> 00:27:26,520
read-write ras, Flips fuq electromagnet ċkejkna għal

504
00:27:26,520 --> 00:27:28,110
frazzjoni ta 'sekonda.

505
00:27:28,110 --> 00:27:31,320
Il-kalamita joħloq qasam li tbiddel l-polarità ta '

506
00:27:31,320 --> 00:27:34,280
ċkejkna, parti ċkejkna mid-partikoli tal-metall li tiksi

507
00:27:34,280 --> 00:27:35,790
wiċċ kull platter s.

508
00:27:35,790 --> 00:27:39,090
Serje mudell ta 'dawn ċkejkna ċċarġjati sal oqsma fuq id-diska

509
00:27:39,090 --> 00:27:41,650
jirrappreżenta ftit uniku ta 'dejta fin-numru binarju

510
00:27:41,650 --> 00:27:43,680
sistema użata mill-kompjuters.

511
00:27:43,680 --> 00:27:45,977
Issa, jekk il-kurrent tkun mibgħuta mod wieħed permezz tal-read-write

512
00:27:45,977 --> 00:27:49,030
ras, l-erja hija polarizzat f'direzzjoni waħda.

513
00:27:49,030 --> 00:27:51,110
Jekk il-kurrent tiġi ssettjata fid-direzzjoni opposta, il-

514
00:27:51,110 --> 00:27:53,070
polarizzazzjoni hija maqluba.

515
00:27:53,070 --> 00:27:55,540
Kif tista 'tikseb informazzjoni off-hard disk?

516
00:27:55,540 --> 00:27:57,270
Just jitwaqqaf il-proċess.

517
00:27:57,270 --> 00:27:59,670
Allura huwa l-partiċelli fuq id-diska li tikseb l-kurrent fil-

518
00:27:59,670 --> 00:28:01,190
il-kap read-write li jiċċaqalqu.

519
00:28:01,190 --> 00:28:04,090
Poġġi flimkien miljuni ta 'dawn is-segmenti magnetized u inti ħadthom

520
00:28:04,090 --> 00:28:05,300
ltqajna fajl.

521
00:28:05,300 --> 00:28:08,600
Issa, il-biċċiet ta 'fajl waħdieni jistgħu jiġu mferrxa madwar

522
00:28:08,600 --> 00:28:11,140
platters drive ta, tip ta bħall-mess ta '

523
00:28:11,140 --> 00:28:13,140
dokumenti dwar iskrivanija tiegħek.

524
00:28:13,140 --> 00:28:16,680
Allura fajl extra speċjali jżomm track tal huwa kollox fejn.

525
00:28:16,680 --> 00:28:18,560
M'għandekx tixtieq inti kienu xi ħaġa bħal dik?

526
00:28:18,560 --> 00:28:19,990
[END video daqq]

527
00:28:19,990 --> 00:28:21,200
>> DAVID J. Malan: Tabilħaqq.

528
00:28:21,200 --> 00:28:25,420
Allura, aħna għandna din il-ħila biex jirrappreżentaw, numri ta 'informazzjoni

529
00:28:25,420 --> 00:28:26,310
f'livell baxx ħafna.

530
00:28:26,310 --> 00:28:29,920
Għandna mod fiżiku ta 'rappreżentanza ta' dan l-istess ħaġa.

531
00:28:29,920 --> 00:28:32,710
Iżda ma nistgħux verament jagħmlu dak kollu li ħafna ta 'interess għadhom

532
00:28:32,710 --> 00:28:34,580
ħlief forsi xi aritmetika u l-matematika.

533
00:28:34,580 --> 00:28:37,660
Għandna l-ebda mod ta 'affarijiet li tirrappreżenta s'issa simili

534
00:28:37,660 --> 00:28:40,310
ittri alfabetiċi hekk li aħna bnedmin jistgħu jikkomunikaw

535
00:28:40,310 --> 00:28:41,970
jużaw dawn il-mezzi l-istess.

536
00:28:41,970 --> 00:28:45,710
Iżda Thankfully teżisti encodings, xejriet ta '0s u

537
00:28:45,710 --> 00:28:49,240
1s, li jirrappreżentaw constructs ogħla livell bħal ub

538
00:28:49,240 --> 00:28:52,740
u ċ u sentenzi sħaħ u l-paragrafi u simili.

539
00:28:52,740 --> 00:28:56,070
U għalhekk ASCII, li huwa akronimu li tirreferi għal dan il-

540
00:28:56,070 --> 00:29:00,410
kodifikazzjoni sistema li biha numru jirrappreżenta ittra mogħtija.

541
00:29:00,410 --> 00:29:04,580
>> Per eżempju, in-numru li nafu valur kif deċimali 65 huwa

542
00:29:04,580 --> 00:29:06,980
magħrufa bħala l-ittra kapitali A għall-kompjuters.

543
00:29:06,980 --> 00:29:10,700
Il-valur deċimali ta '97 fil-kompjuters huwa magħruf bħala

544
00:29:10,700 --> 00:29:11,980
zghar a.

545
00:29:11,980 --> 00:29:13,070
U dak li verament ma jfisser?

546
00:29:13,070 --> 00:29:15,520
Ukoll, anke jekk Nate mument ilu biss magħduda

547
00:29:15,520 --> 00:29:20,460
0-8, jekk konna biex ikomplu jgħoddu sa 65 jew

548
00:29:20,460 --> 00:29:24,180
ulterjuri sa 97, il-mudell ta '0s u 1s li kien ikollu

549
00:29:24,180 --> 00:29:27,810
imfassal fuq l-iskrin se jkun eżattament dak kompjuter juża

550
00:29:27,810 --> 00:29:30,300
biex jirrappreżenta l-ittra A fil-limiti jew

551
00:29:30,300 --> 00:29:32,470
l-ittra ta 'fil-zghar.

552
00:29:32,470 --> 00:29:35,460
U fil-fatt, hemm skema ġenerali għal dan.

553
00:29:35,460 --> 00:29:38,170
Dan huwa, ewwel daqqa t'għajn, chart assoluta ta '

554
00:29:38,170 --> 00:29:41,150
encodings, imma jekk inti tiffoka biss fuq in-nofs dritt hawn,

555
00:29:41,150 --> 00:29:45,820
Avviż f'din il-kolonna tan-nofs aħna għandna dan il-kunċett ta 'numri

556
00:29:45,820 --> 00:29:46,860
segwita bl-ittri.

557
00:29:46,860 --> 00:29:48,640
U fil-quċċata għandna 32.

558
00:29:48,640 --> 00:29:53,270
U l-karattru, char, li 32, l-eqreb numru sħiħ, tirreferi

559
00:29:53,270 --> 00:29:55,220
hija apparentement l-karattru Bar Ispazju.

560
00:29:55,220 --> 00:29:57,350
Meta inti hit-karattru Bar Ispazju fuq laptop tiegħek,

561
00:29:57,350 --> 00:30:00,110
tajjeb, dak li int verament tibgħat huwa numru, mudell

562
00:30:00,110 --> 00:30:02,620
tal 0s u 1s, fluss ta 'l-elettriku jekk inti se,

563
00:30:02,620 --> 00:30:05,630
jirrappreżentaw dawk 0s u 1s li l-kompjuter imbagħad

564
00:30:05,630 --> 00:30:08,190
jinterpreta bħala karattru spazju fuq l-iskrin.

565
00:30:08,190 --> 00:30:10,070
An punt exclamation huwa 33.

566
00:30:10,070 --> 00:30:11,210
Kwotazzjonijiet Double huwa 34.

567
00:30:11,210 --> 00:30:14,890
U jekk aħna iscroll hawn fuq għad-dritt, naraw li

568
00:30:14,890 --> 00:30:18,840
65 huwa tabilħaqq A, u 97 hija tabilħaqq zghar a.

569
00:30:18,840 --> 00:30:21,690
>> U hekk issa li għandna din l-iskema ta 'kodifikazzjoni, nistgħu tibda

570
00:30:21,690 --> 00:30:22,920
li jespliċitaw affarijiet out.

571
00:30:22,920 --> 00:30:27,180
Tabilħaqq, il-kompjuters tipikament jesprimu ruħhom fl-istandard

572
00:30:27,180 --> 00:30:29,980
unitajiet, li ma jużawx l-ftit individwu, li għal darb'oħra huwa mhux kollha

573
00:30:29,980 --> 00:30:33,630
li utli għal ftit tirrappreżenta 0 jew 1, dwal fuq jew barra, imma

574
00:30:33,630 --> 00:30:35,390
minflok jużaw sekwenzi ta 'bits.

575
00:30:35,390 --> 00:30:37,610
U l-unità l-aktar komuni ta 'miżura, kif inti probabilment taf

576
00:30:37,610 --> 00:30:39,370
u jew għall-inqas inferit, huwa byte.

577
00:30:39,370 --> 00:30:43,820
A byte huwa biss tmien bits, 8 0s jew 1s fil-filliera.

578
00:30:43,820 --> 00:30:45,950
Allura aħna tista 'tibda ortografija affarijiet out.

579
00:30:45,950 --> 00:30:48,990
U għalhekk, jekk nistgħu, għaliex ma tippruvax din id-daqsxejn ta 'ftit

580
00:30:48,990 --> 00:30:50,440
kollettivament hawn.

581
00:30:50,440 --> 00:30:53,630
Hemm tmien persuni f'din il-kamra li jkunu lesti li

582
00:30:53,630 --> 00:30:54,660
toħroġ fuq il-palk?

583
00:30:54,660 --> 00:30:57,790
Int għandek tkun komda li jidhru fuq camera, imma int

584
00:30:57,790 --> 00:30:59,860
ma verament bżonn tkun taf, inkella, x'hemm

585
00:30:59,860 --> 00:31:01,550
għaddejjin għadha biss.

586
00:31:01,550 --> 00:31:05,080
Nara persuna waħda li qed volontarju hawn fuq.

587
00:31:05,080 --> 00:31:16,220
Tnejn, tlieta, erba ', ħames, sitt, seba', u kif madwar 8.

588
00:31:16,220 --> 00:31:16,800
Come fuq up.

589
00:31:16,800 --> 00:31:20,390
>> Allura inti ser jirrappreżentaw byte ta 'nies.

590
00:31:20,390 --> 00:31:26,750
Let me jkollhom inti tkun il-post tal-128, inti post il-64, inti

591
00:31:26,750 --> 00:31:28,050
post l-32 ta.

592
00:31:28,050 --> 00:31:30,530
Iżda aħna qed gonna malajr ħafna għandek biex ireġġgħu lura din.

593
00:31:30,530 --> 00:31:33,030
So let me jissodisfaw inti kollha hemmhekk.

594
00:31:33,030 --> 00:31:37,230
U inti għandek tkun fil-post tal-128 tal-triq kollha hawn fuq.

595
00:31:37,230 --> 00:31:39,500
Ħafna bħall-post mijiet u l-post eluf kieku

596
00:31:39,500 --> 00:31:42,050
tkun farther lejn ix-xellug, irridu li l-placeholder akbar

597
00:31:42,050 --> 00:31:43,600
li jkun hawn ix-xellug kif ukoll.

598
00:31:43,600 --> 00:31:53,090
Għandna 32 64s, l-16 ta, 8, l-4 ta, 2, u 1 s.

599
00:31:53,090 --> 00:31:53,900
Eċċellenti.

600
00:31:53,900 --> 00:31:56,090
Allura issa għandna -

601
00:31:56,090 --> 00:31:58,050
OK, inti tista 'tgħin.

602
00:31:58,050 --> 00:32:00,085
Allura issa għandna - x'hemm isem tiegħek?

603
00:32:00,085 --> 00:32:00,420
JOANNE: Joanne.

604
00:32:00,420 --> 00:32:00,830
DAVID J. Malan: Joanne.

605
00:32:00,830 --> 00:32:04,100
So Joanne u I issa se jagħti pariri dawn guys dwar kif nistgħu

606
00:32:04,100 --> 00:32:05,860
tista 'tmur dwar ortografija xi ħaġa barra.

607
00:32:05,860 --> 00:32:07,730
Allura fuq il-dahar ta 'folji tagħhom ta' karta, dawn ikollhom

608
00:32:07,730 --> 00:32:10,160
ftit iqarrqu folja li għaddej biex jgħidulhom jekk

609
00:32:10,160 --> 00:32:12,590
kienu jirrappreżentaw 0 jew 1.

610
00:32:12,590 --> 00:32:15,870
U għaliex ma għas-sempliċità, aħna ser jirrappreżentaw 0 bi ftit

611
00:32:15,870 --> 00:32:17,440
permanenti hemmhekk awkwardly.

612
00:32:17,440 --> 00:32:18,220
Tajjeb ħafna.

613
00:32:18,220 --> 00:32:22,060
Jew. 1 billi tgħolli naħa tiegħek, li jirrappreżentaw 1

614
00:32:22,060 --> 00:32:25,430
U ejja ara jekk ma nkunux nistgħu tispjega karattru 4

615
00:32:25,430 --> 00:32:26,250
frażi hawn.

616
00:32:26,250 --> 00:32:30,930
>> Allura, imorru quddiem issa, voluntiera, u jesegwixxi 1 round billi

617
00:32:30,930 --> 00:32:33,390
kuxjenza naħa tiegħek jekk int 1 jew iż-żamma

618
00:32:33,390 --> 00:32:36,820
jistabbilixxi jekk int 0.

619
00:32:36,820 --> 00:32:42,280
Allura, issa li għandna dawn idejn 3 up, liema numru,

620
00:32:42,280 --> 00:32:45,670
kulħadd, dawn huma fil-fatt jirrappreżentaw?

621
00:32:45,670 --> 00:32:45,950
OK.

622
00:32:45,950 --> 00:32:46,290
67.

623
00:32:46,290 --> 00:32:46,910
Għaliex?

624
00:32:46,910 --> 00:32:47,830
Ukoll, sanità malajr check.

625
00:32:47,830 --> 00:32:53,200
Post 64, għaliex dan huwa ta '1, li huwa simili 1 drabi 64 flimkien ma '1

626
00:32:53,200 --> 00:32:56,565
drabi 2, b'tali mod li 66 flimkien ma '1 żminijiet 1.

627
00:32:56,565 --> 00:32:58,470
Li flimkien ma '1, hekk 67.

628
00:32:58,470 --> 00:33:01,020
Allura issa dawn guys huma kollettivament jirrappreżentaw 67

629
00:33:01,020 --> 00:33:04,110
li apparentement jirrappreżenta dak hawn fil ASCII?

630
00:33:04,110 --> 00:33:04,380
OK.

631
00:33:04,380 --> 00:33:05,140
Allura c.

632
00:33:05,140 --> 00:33:05,510
Kull dritt.

633
00:33:05,510 --> 00:33:07,400
Allura issa ejja tipproċedi biex round tnejn.

634
00:33:07,400 --> 00:33:08,940
Kulħadd jibdew bl-idejn tagħhom isfel.

635
00:33:08,940 --> 00:33:10,590
U f'rawnd 2 -

636
00:33:10,590 --> 00:33:12,410
attwalment hemm Ma tantx ta 'rwol hawn, I suppose, iżda

637
00:33:12,410 --> 00:33:13,130
aħna ser nippretendu.

638
00:33:13,130 --> 00:33:17,690
Allura round 2, jgħollu jew ibaxxu idejk.

639
00:33:17,690 --> 00:33:18,380
>> Kull dritt.

640
00:33:18,380 --> 00:33:22,700
Audience, dak li aħna issa jesprimu huwa 83.

641
00:33:22,700 --> 00:33:23,910
Allura inti tista 'tagħmel l-matematika.

642
00:33:23,910 --> 00:33:27,000
Iżda għal xi ħadd li idejn huwa up, inti żid fil-numru li

643
00:33:27,000 --> 00:33:27,670
dawn jirrappreżentaw.

644
00:33:27,670 --> 00:33:29,470
Allura issa għandna 83.

645
00:33:29,470 --> 00:33:32,140
Ejja jespandu l-iqarrqu karta ftit, u issa għandna -?

646
00:33:32,140 --> 00:33:34,340
[Inaudible]

647
00:33:34,340 --> 00:33:35,370
DAVID J. Malan: OK.

648
00:33:35,370 --> 00:33:36,740
Dan jista 'jkun ovvju fejn aħna qed tmur hawn, iżda

649
00:33:36,740 --> 00:33:40,080
madankollu, tondi 3.

650
00:33:40,080 --> 00:33:40,455
OK.

651
00:33:40,455 --> 00:33:41,730
Round 3 huwa tajjeb li jinżlu hemmhekk.

652
00:33:41,730 --> 00:33:44,450
Allura round tlieta, liema numru huma dawn guys issa

653
00:33:44,450 --> 00:33:45,700
jirrappreżentaw?

654
00:33:47,940 --> 00:33:48,200
OK.

655
00:33:48,200 --> 00:33:51,770
Smajt 53, li issa jirrappreżenta?

656
00:33:51,770 --> 00:33:54,550
Interessanti.

657
00:33:54,550 --> 00:33:58,630
Issa għaliex dan it-tip ta 'riżultat intuwittivi kontro, id-dritt?

658
00:33:58,630 --> 00:34:00,890
Jekk irridu li jirrappreżentaw 5 - aħna lkoll probabilment taf

659
00:34:00,890 --> 00:34:01,770
fejn dan ikun għaddej -

660
00:34:01,770 --> 00:34:05,230
għaliex ma I biss jgħollu post l-4 u l-post tal-1 ta?

661
00:34:05,230 --> 00:34:07,340
>> Ukoll, tirrealizza li hemm differenza, fundamentalment,

662
00:34:07,340 --> 00:34:09,630
bejn kif kompjuter tinterpreta dawn bits.

663
00:34:09,630 --> 00:34:13,030
Jekk inti qed tipprova jirrappreżentaw in-numru 5, allura assolutament,

664
00:34:13,030 --> 00:34:16,199
aħna biss jgħollu 4 numru idejn u jgħollu numru idejn 1.

665
00:34:16,199 --> 00:34:17,880
Iżda aħna ma tkunx qed jirrappreżentaw numri hawn.

666
00:34:17,880 --> 00:34:20,710
Il-kuntest hawnhekk fuq il-palk huwa li aħna qed jirrappreżentaw

667
00:34:20,710 --> 00:34:22,300
karattri, jew jaħraq.

668
00:34:22,300 --> 00:34:25,139
U f'dan il-kuntest il-kompjuter irid tirrealizza li,

669
00:34:25,139 --> 00:34:28,780
oh, dan il-mudell ta 'bits ma jkunx numru waħdu, huwa

670
00:34:28,780 --> 00:34:31,620
attwalment jirrappreżenta kunċett f'livell ogħla, f'dan il-każ

671
00:34:31,620 --> 00:34:32,840
alfabetiku ittra.

672
00:34:32,840 --> 00:34:36,600
Allura l-fatt li issa huwa tirrappreżenta n-numru 5 bil

673
00:34:36,600 --> 00:34:40,550
il-valur ta '53 għaliex fil ASCII il-ħaġa aħna

674
00:34:40,550 --> 00:34:44,280
estetikament tara kif il-numru 5 nnifisha teħtieġ

675
00:34:44,280 --> 00:34:45,290
mudell ta 'bits.

676
00:34:45,290 --> 00:34:46,080
Minħabba għaliex?

677
00:34:46,080 --> 00:34:48,780
Ukoll, id-dinja biss iddeċidew li jużaw in-numri baxxi, 0,

678
00:34:48,780 --> 00:34:51,989
1, 2, 3, għal dak tfittex li tkun l-affarijiet pjuttost mistur.

679
00:34:51,989 --> 00:34:54,070
U fil-fatt, dawn huma l-karattri li mhumiex fuq

680
00:34:54,070 --> 00:34:56,870
, espressjonijiet tastiera speċjali li għandek bżonn fil-kompjuter għall-

681
00:34:56,870 --> 00:34:58,800
tagħmel affarijiet interessanti, imma l-bnedmin qatt

682
00:34:58,800 --> 00:34:59,880
fil-fatt tip tagħhom.

683
00:34:59,880 --> 00:35:02,080
Allura 53 tabilħaqq jirrappreżenta 5.

684
00:35:02,080 --> 00:35:08,320
Issa, hekk kif kontroll sanità finali, dak in-numru jekk dawn

685
00:35:08,320 --> 00:35:10,356
jirrappreżentaw ftit mument?

686
00:35:10,356 --> 00:35:10,752
UDJENZA: 48.

687
00:35:10,752 --> 00:35:11,150
DAVID J. Malan: OK.

688
00:35:11,150 --> 00:35:11,920
Allura 48.

689
00:35:11,920 --> 00:35:12,770
U fil-fatt, imorru quddiem.

690
00:35:12,770 --> 00:35:14,020
Round 4.

691
00:35:16,510 --> 00:35:20,540
16 plus 32 huwa, tabilħaqq, 48.

692
00:35:20,540 --> 00:35:22,830
U hekk rawnd kbir ta 'applause, jekk nistgħu, għall tagħna

693
00:35:22,830 --> 00:35:25,382
8 voluntiera hawn.

694
00:35:25,382 --> 00:35:25,870
Grazzi.

695
00:35:25,870 --> 00:35:27,822
Tista 'żżomm dan wieħed.

696
00:35:27,822 --> 00:35:29,286
Jekk inti -

697
00:35:29,286 --> 00:35:30,536
Tajjeb ħafna x'isir.

698
00:35:33,140 --> 00:35:34,360
Kwalunkwe direzzjoni huwa multa.

699
00:35:34,360 --> 00:35:37,950
>> Allura, issa għandna mod mhux biss ta 'ħsieb dwar kif

700
00:35:37,950 --> 00:35:40,810
jirrapreżenta data u fil-fatt jirrappreżentaw dan fiżikament,

701
00:35:40,810 --> 00:35:43,650
iżda wkoll tagħmel ta 'livell ogħla affarijiet fuq quċċata ta' dan.

702
00:35:43,650 --> 00:35:45,640
Tabilħaqq, dan se tkun tema madwar kompjuter

703
00:35:45,640 --> 00:35:48,630
xjenza tal-bini kumplessi aktar u aktar interessanti

704
00:35:48,630 --> 00:35:52,170
affarijiet fuq quċċata ta 'ideat pjuttost sempliċi, f'dan

705
00:35:52,170 --> 00:35:54,040
każ biss 0s u 1s.

706
00:35:54,040 --> 00:35:57,270
F'termini ta 'għaliex dan ikun utli, sew anki jekk b'mod

707
00:35:57,270 --> 00:35:59,760
Naturalment bħal dan aħna ser tiffoka fuq fatturi fundamentali u fuq

708
00:35:59,760 --> 00:36:03,120
programmazzjoni u fuq soluzzjoni ta 'problemi, inti tista' tmur off

709
00:36:03,120 --> 00:36:04,970
xjenza tal-kompjuter fi kwalunkwe numru ta 'direzzjonijiet.

710
00:36:04,970 --> 00:36:07,600
F'dan il-każ hawnhekk, dan huwa chart li inti għandek fil-

711
00:36:07,600 --> 00:36:11,120
back paġna ta 'gwida mhux uffiċjali tiegħek biex CS fil-Harvard, wieħed mill-

712
00:36:11,120 --> 00:36:12,450
lum 2 printouts.

713
00:36:12,450 --> 00:36:14,270
Dan jissuġġerixxi d-direzzjonijiet differenti ħafna li fihom

714
00:36:14,270 --> 00:36:16,270
inti tista 'tmur wara kors bħal dan.

715
00:36:16,270 --> 00:36:19,170
Tagħlim dwar intelliġenza artifiċjali, dwar grafika,

716
00:36:19,170 --> 00:36:22,230
dwar it-tagħlim tal-magni, dwar il-lingwa nnifisha.

717
00:36:22,230 --> 00:36:23,975
Realizzata, wisq, li hemm għad mogħdijiet oħrajn.

718
00:36:23,975 --> 00:36:26,550
Hemm mogħdijiet aktar matematiċi fix-xjenza tal-kompjuter.

719
00:36:26,550 --> 00:36:29,020
Jekk int lanqas kapaċi tieħu xi ħaġa bħal din CS50

720
00:36:29,020 --> 00:36:30,930
jaqgħu, hemm korsijiet ta 'introduzzjoni fir-rebbiegħa.

721
00:36:30,930 --> 00:36:33,420
Computer Science 1, per eżempju, huwa pass ieħor

722
00:36:33,420 --> 00:36:35,920
on-rampa li din id-dinja ġdida.

723
00:36:35,920 --> 00:36:38,230
>> Issa bħala twarrib fl-interess tal soluzzjoni ta 'problemi

724
00:36:38,230 --> 00:36:41,380
relatati ma 'korsijiet, tirrealizza li CS50 stabbiliti xi żmien

725
00:36:41,380 --> 00:36:44,405
ilu biex jippruvaw isolvu waħda minn dawn il-problemi, il-problema magħrufa

726
00:36:44,405 --> 00:36:47,500
kif my.harvard, li ħafna minnkom jista 'jkun bl-użu li fil-fatt

727
00:36:47,500 --> 00:36:48,480
shop għall-korsijiet.

728
00:36:48,480 --> 00:36:51,900
Imma jekk le, check out għodda bħal din, kif ukoll oħrajn

729
00:36:51,900 --> 00:36:54,130
dixxendenti li xi studenti passat tagħna

730
00:36:54,130 --> 00:36:55,660
u l-istaff ħolqu.

731
00:36:55,660 --> 00:36:57,970
Iżda fil-Korsijiet Harvard, li hija għodda fuq l-Internet -

732
00:36:57,970 --> 00:37:00,680
xi ħaġa li inti se tkun kapaċi ta 'tfassil u

733
00:37:00,680 --> 00:37:04,610
iskjerament lilek innifsek, kif ukoll għad affarijiet oħra kif ukoll, mill-

734
00:37:04,610 --> 00:37:05,920
l-aħħar tas-semestru.

735
00:37:05,920 --> 00:37:08,890
Jirrealizzaw li dan jibni fuq sett ta 'data miftuħa, f'dan il-każ

736
00:37:08,890 --> 00:37:11,350
katalogu kors, u jippermetti lill-istudenti f'dan il-każ għall-

737
00:37:11,350 --> 00:37:14,180
jesploraw sett ta 'dejta pjuttost kumplessa.

738
00:37:14,180 --> 00:37:16,710
>> Aħna dug up lejl li għadda statistika ftit bbażata fuq il-ftit

739
00:37:16,710 --> 00:37:18,200
elf folks li kienu jużaw din fuq

740
00:37:18,200 --> 00:37:19,380
l-aħħar ftit jiem.

741
00:37:19,380 --> 00:37:22,630
Jekk inti kont qed kurjużi biex ikunu jafu kemm korsijiet ħbieb tiegħek

742
00:37:22,630 --> 00:37:25,900
fil-fatt it-tendenza li shop, ukoll, illum id-data huwa tissuġġerixxi li

743
00:37:25,900 --> 00:37:29,260
7.6 huwa n-numru medju ta 'korsijiet fuq

744
00:37:29,260 --> 00:37:30,470
lista tax-xiri ta 'xi ħadd.

745
00:37:30,470 --> 00:37:33,730
U issa jien ser jagħtuk, ukoll, l-istatistika ta 'l-aktar

746
00:37:33,730 --> 00:37:36,500
numru ta 'korsijiet fuq il-lista tax-xiri ta' xi ħadd.

747
00:37:36,500 --> 00:37:38,220
U lkoll probabilment taf xi ħadd bħal dan.

748
00:37:41,700 --> 00:37:44,610
201 huwa rekord din is-sena.

749
00:37:44,610 --> 00:37:47,220
Issa xi wħud ex-studenti tagħna u l-istaff attwalment

750
00:37:47,220 --> 00:37:52,210
jitqiegħdu flimkien clip li żebgħa stampa għalik ta 'dak li din

751
00:37:52,210 --> 00:37:55,220
passaġġ ta 'xjenza tal-kompjuter u CS50 nnifisha hija.

752
00:37:55,220 --> 00:37:58,350
Let me imorru quddiem u iġbed up, grazzi lis-Sur Hahvahd hawn,

753
00:37:58,350 --> 00:38:02,390
video prodotta minn xi wħud mill-predeċessuri tiegħek.

754
00:38:02,390 --> 00:38:04,680
Jekk nistgħu iżommu l-dwal għal dan.

755
00:38:07,860 --> 00:39:08,101
[Daqq ta 'video]

756
00:39:08,101 --> 00:39:11,987
[END video daqq]

757
00:39:11,987 --> 00:39:14,160
>> SPEAKER 14: (KANT) Nieħdu żmien tagħna ma 'xi scratch,

758
00:39:14,160 --> 00:39:17,410
għal loops, avvenimenti, nistgħu nlaqqgħu, kumpilazzjoni użu tagħna

759
00:39:17,410 --> 00:39:20,370
bash, dan it-terminu mhux se jkun imtaqqab.

760
00:39:20,370 --> 00:39:23,970
Gost Hacking, xi ikliet bla ħlas, lectures huma sempliċiment unreal,

761
00:39:23,970 --> 00:39:28,200
ġust tagħna huwa tali big deal, hemm tant li adore.

762
00:39:28,200 --> 00:39:29,784
Mur, David Malan.

763
00:39:29,784 --> 00:39:31,810
Walkthroughs, jien ma bailing.

764
00:39:31,810 --> 00:39:33,794
Ħinijiet tal-uffiċċju, ebda wieħed tfalli.

765
00:39:33,794 --> 00:39:36,274
Fejn taħseb li int kodifikazzjoni, baby?

766
00:39:36,274 --> 00:39:40,242
Ħej, I biss sodisfatti int u dan huwa crazy,

767
00:39:40,242 --> 00:39:42,226
imma hawn l raāuni tagħna.

768
00:39:42,226 --> 00:39:44,210
Ħu CS50.

769
00:39:44,210 --> 00:39:48,674
Huwa diffiċli li d-dritt kodiċi mingħajr ma inti, tarbija.

770
00:39:48,674 --> 00:39:50,658
Iżda hawn raġuni tagħna.

771
00:39:50,658 --> 00:39:52,146
Ħu CS50.

772
00:39:52,146 --> 00:39:56,610
Ħej, I biss sodisfatti int u dan huwa crazy,

773
00:39:56,610 --> 00:39:58,098
imma hawn l raāuni tagħna.

774
00:39:58,098 --> 00:40:00,082
Ħu CS50.

775
00:40:00,082 --> 00:40:06,530
U kull ditta star irid kiri lili, raġuni oħra.

776
00:40:06,530 --> 00:40:08,018
Ħu CS50.

777
00:40:08,018 --> 00:40:12,978
Qabel ma inti daħal fis-ħajja tiegħi, jien kodifikati daqshekk ħżiena, I kodifikati sabiex

778
00:40:12,978 --> 00:40:15,954
bad, I kodifikati hekk, daqshekk ħżiena.

779
00:40:15,954 --> 00:40:19,922
Qabel ma inti daħal fis-ħajja tiegħi, jien kodifikati daqshekk ħżiena

780
00:40:19,922 --> 00:40:22,402
u I ma tistax tmur lura.

781
00:40:22,402 --> 00:40:37,410
Ħu CS50.

782
00:40:37,410 --> 00:40:40,490
>> DAVID J. Malan: I kellhom ebda idea li kien se jiġri.

783
00:40:40,490 --> 00:40:44,030
Allura, ħarsa aktar serju lejn dak li jinsab quddiem.

784
00:40:44,030 --> 00:40:45,980
Allura f'termini ta 'l-aspettattivi tal dan il-kors,

785
00:40:45,980 --> 00:40:48,490
int fil-fatt mistennija li jattendu jew tara l-kors tal-

786
00:40:48,490 --> 00:40:51,600
lectures, tissottometti sett problema, jieħdu żewġ kwizzijiet, tissottometti

787
00:40:51,600 --> 00:40:52,590
finali tal-proġett.

788
00:40:52,590 --> 00:40:56,250
F'termini ta 'gradi, tirrealizza li kumment tiegħi fil-ftuħ

789
00:40:56,250 --> 00:40:58,190
dwar suċċess / falliment, xi ħaġa li aħna ħafna jieħdu biex

790
00:40:58,190 --> 00:40:59,310
qalb CS50.

791
00:40:59,310 --> 00:41:02,970
Hemm m'huwiex biżżejjed ta 'kultura fil-Harvard ta' tipprova

792
00:41:02,970 --> 00:41:04,940
xi ħaġa u qed joħloq riskju falliment.

793
00:41:04,940 --> 00:41:07,010
Tabilħaqq, kellna numru ta 'studenti, u myself, fil-

794
00:41:07,010 --> 00:41:09,910
partikolari, li kienu mħassba dwar jolqtu ħażin GPA tiegħek jew

795
00:41:09,910 --> 00:41:13,170
jkollna B fil xi ħaġa simili CS50.

796
00:41:13,170 --> 00:41:16,250
U l-opportunità li jieħdu kors bħal dan, u oħrajn

797
00:41:16,250 --> 00:41:19,080
korsijiet portal fil-livell tal-bidu, suċċess / falliment

798
00:41:19,080 --> 00:41:22,190
hija opportunità ferm underutilized fuq dan il-kulleġġ,

799
00:41:22,190 --> 00:41:22,620
b'mod ġenerali.

800
00:41:22,620 --> 00:41:25,420
U għalhekk jekk jogħġbok jafu anke I rreġistrati dan il-kors

801
00:41:25,420 --> 00:41:28,430
inizjalment għal suċċess / falliment ta 'kreditu biss.

802
00:41:28,430 --> 00:41:30,710
U anki jekk I ma jaqilbu fl-aħħar tal-ġurnata, kien

803
00:41:30,710 --> 00:41:33,280
dawk il-ġimgħat 5 inizjali, sa l-it-Tnejn 5 ta 'l-

804
00:41:33,280 --> 00:41:36,020
semestru li huwa l-cutoff, li permessi me biex attwalment

805
00:41:36,020 --> 00:41:39,270
mressqa marda fis-dawn l-ilmijiet ġodda u fil-fatt tipprova xi ħaġa

806
00:41:39,270 --> 00:41:41,520
ħafna familjari u skomda ħafna

807
00:41:41,520 --> 00:41:43,400
għalija fil-ħin.

808
00:41:43,400 --> 00:41:47,130
>> Allura f'termini, issa, dwar liema rwol l-angoli differenti li permezz tagħhom

809
00:41:47,130 --> 00:41:50,630
inti tista 'tavviċina dan il-kors jservu, hekk lectures, huwa sa

810
00:41:50,630 --> 00:41:53,330
jekk inti tidħol magħna personalment fil dan il-post.

811
00:41:53,330 --> 00:41:57,590
Tabilħaqq, nafu statistikament li madwar 40% tal inti se

812
00:41:57,590 --> 00:41:59,530
tip ta 'jiġu u jmorru matul il-kors tas-semestru.

813
00:41:59,530 --> 00:42:03,000
U 10% tal inti, aħna qatt se tara mill-ġdid wara illum.

814
00:42:03,000 --> 00:42:05,400
U li perfettament multa, li tkun onest.

815
00:42:05,400 --> 00:42:07,810
Waħda mill-elementi ewlenin tal CS50 hija

816
00:42:07,810 --> 00:42:10,160
li hemm dawn ir-riżorsi innumerabbli, li wħud

817
00:42:10,160 --> 00:42:12,570
li aħna ser Rattle permezz fi ftit mument, inkluż

818
00:42:12,570 --> 00:42:15,320
lectures u sezzjonijiet u affarijiet imsejħa walkthroughs u

819
00:42:15,320 --> 00:42:16,720
uffiċċju sigħat u simili.

820
00:42:16,720 --> 00:42:18,890
U huwa aktar riżorsi milli l-istudent tipiċi għandhom

821
00:42:18,890 --> 00:42:21,580
jkollhom jew jista 'fiżikament tieħu vantaġġ minnhom.

822
00:42:21,580 --> 00:42:23,650
Imma dak li minħabba l-istili differenti ta 'tagħlim li

823
00:42:23,650 --> 00:42:25,370
kwalunkwe korp student manifesti.

824
00:42:25,370 --> 00:42:28,120
U għalhekk fil-lekċers, ir-rwol primarju, kif naraha jien, huwa

825
00:42:28,120 --> 00:42:31,650
li ma verbalment timbotta l-materjal pjuttost kumplessa u li

826
00:42:31,650 --> 00:42:34,670
neċessarjament jagħti kollha tal-intricacies tal-

827
00:42:34,670 --> 00:42:36,910
fundamentali li aħna ser tesplora dan is-semestru, iżda

828
00:42:36,910 --> 00:42:39,530
pjuttost biex tagħmel affarijiet simili aħna kont qed tagħmel s'issa diġà,

829
00:42:39,530 --> 00:42:42,350
dawn l-eżempji, li jinvolvu bnedmin onstage, tipprova

830
00:42:42,350 --> 00:42:45,340
żebgħa stampa mentali, u wkoll joħolqu, DARE I say, xi

831
00:42:45,340 --> 00:42:46,450
ta 'dawn il-mumenti memorabbli.

832
00:42:46,450 --> 00:42:49,200
Allura li anki kif inti ibatu ma 'ċerti suġġetti, inti għandek

833
00:42:49,200 --> 00:42:51,770
dawn il-memorji simili, oh, minkejja li dan kien pjuttost

834
00:42:51,770 --> 00:42:54,770
astratt, il-matematika, I ltqajna mitlufa li jwettqu l-1, bhalu

835
00:42:54,770 --> 00:42:57,510
verament, fl-aħħar tal-ġurnata, huwa mhux kollha li differenti għal

836
00:42:57,510 --> 00:42:58,920
xi ħaġa I diġà jafu.

837
00:42:58,920 --> 00:43:01,590
U għalhekk l-irwol li lectures se jservi, sew personalment

838
00:43:01,590 --> 00:43:05,120
hawn Sanders jew online fuq video, huwa verament li jiġu stabbiliti l-

839
00:43:05,120 --> 00:43:08,170
istadju mentalment għalik kull ġimgħa għall-kunċetti varji

840
00:43:08,170 --> 00:43:10,240
u l-problemi li aħna ser tkun għadis fis.

841
00:43:10,240 --> 00:43:13,790
>> F'termini tal-kunċetti ta 'livell għoli, ħafna minn dawn il-kliem

842
00:43:13,790 --> 00:43:16,340
tista 'toħroġ fuq kap tiegħek għall-mument, u li l-multa.

843
00:43:16,340 --> 00:43:18,495
Għal dawk tal inti li jidħlu fil-kors aktar komdi

844
00:43:18,495 --> 00:43:20,150
se jkun jaf ta 'xi wħud minn dawn is-suġġetti.

845
00:43:20,150 --> 00:43:23,150
Iżda tipikament għal dak ta '10% tal-klassi li għaliha huma għandhom

846
00:43:23,150 --> 00:43:25,810
isfond ħafna aktar, filwaqt AP xjenza tal-kompjuter,

847
00:43:25,810 --> 00:43:28,200
programmazzjoni peress li kienu 12, tirrealizza li se jkun hemm

848
00:43:28,200 --> 00:43:31,230
opportunitajiet fis-sezzjonijiet u fil-problema settijiet li jmorru l-

849
00:43:31,230 --> 00:43:34,240
aktar fil-fond fis-suġġetti varji, mili fi kwalunkwe

850
00:43:34,240 --> 00:43:36,710
lakuni inti jista 'jkollok mill-iskola għolja tiegħek jew qabel

851
00:43:36,710 --> 00:43:37,460
isfond.

852
00:43:37,460 --> 00:43:39,930
F'termini ta 'l-ilsna, tirrealizza li dak li aħna lingwa

853
00:43:39,930 --> 00:43:42,550
użu CS50 huwa irrilevanti għal kollox fuq

854
00:43:42,550 --> 00:43:43,220
l-aħħar tal-ġurnata.

855
00:43:43,220 --> 00:43:47,090
Aħna jiġri għall-użu, primarjament, lingwa imsejjaħ C. Lejn l-

856
00:43:47,090 --> 00:43:49,010
aħħar tas-semestru, aħna jintroduċu web iċċentrati

857
00:43:49,010 --> 00:43:51,110
lingwi bħal PHP u JavaScript.

858
00:43:51,110 --> 00:43:54,280
Iżda aħna u oħrajn jistgħu jgħallmu kors bħal dan fil-maġġoranza f'kull

859
00:43:54,280 --> 00:43:55,610
moderni ta 'livell għoli tal-lingwa.

860
00:43:55,610 --> 00:43:58,520
Python u Ruby u oħrajn huma popolari dawn il-jiem.

861
00:43:58,520 --> 00:44:00,970
Minħabba tirrealizza fl-aħħar tal-ġurnata, int ma tagħlim

862
00:44:00,970 --> 00:44:04,180
f'dan C. kors Int mhux tagħlim PHP jew JavaScript.

863
00:44:04,180 --> 00:44:07,140
Inti tagħlim kif issolvi problemi, kemm jekk fuq l-internet,

864
00:44:07,140 --> 00:44:10,480
kompjuter ibbażata, jew data orjentati lejn innifsu, bl-użu

865
00:44:10,480 --> 00:44:12,700
dawn sempliċement bħala għodda.

866
00:44:12,700 --> 00:44:14,730
>> Issa, fir-rigward tal-loġistika, inti ser tuża

867
00:44:14,730 --> 00:44:16,670
xi ħaġa, eventwalment, imsejjaħ il Appliance CS50.

868
00:44:16,670 --> 00:44:19,350
Ma jimpurtax jekk għandek Mac, PC, kompjuter Linux,

869
00:44:19,350 --> 00:44:20,010
jew simili.

870
00:44:20,010 --> 00:44:22,510
Int ser ikollok is-software disponibbli liberament jibdew il-ġimgħa d-dieħla

871
00:44:22,510 --> 00:44:25,460
li biha jużaw il-Appliance CS50, virtwali

872
00:44:25,460 --> 00:44:28,020
ambjent li inti ser tuża fuq il-kompjuter tiegħek sabiex inti

873
00:44:28,020 --> 00:44:31,120
u kollha ta 'klassi tiegħek jkollhom desktop Linux uniformi

874
00:44:31,120 --> 00:44:31,890
f'dan il-każ.

875
00:44:31,890 --> 00:44:34,390
Huwa l-settijiet problema, għalkemm, li inti ser verament tikseb

876
00:44:34,390 --> 00:44:35,780
idejk maħmuġin fil-kors.

877
00:44:35,780 --> 00:44:37,630
U fl-aħħar tal-ġurnata, huwa l-settijiet problema, I

878
00:44:37,630 --> 00:44:39,680
jaħsbu, li verament jiddefinixxu l-istudenti

879
00:44:39,680 --> 00:44:41,380
esperjenza f'dan il-kors.

880
00:44:41,380 --> 00:44:43,460
Tirrealizza li ħafna mill-settijiet problema se jiġu rilaxxati

881
00:44:43,460 --> 00:44:46,430
f'żewġ edizzjonijiet, żieda standard li nistennew u

882
00:44:46,430 --> 00:44:49,550
jinkoraġġixxi 90% tal-klassi li adsa fis.

883
00:44:49,550 --> 00:44:51,620
Iżda aħna wkoll rilaxx xi settijiet problematiċi fl

884
00:44:51,620 --> 00:44:52,920
hekk imsejħa żidiet Hacker.

885
00:44:52,920 --> 00:44:54,900
U inti taf huwa ż-żieda Hacker għaliex fuq kull paġna

886
00:44:54,900 --> 00:44:57,840
bil-watermark li jgħid Barra Hacker fuqha.

887
00:44:57,840 --> 00:45:00,000
U li għal dan demografika minnkom li jkollhom AP

888
00:45:00,000 --> 00:45:02,890
xjenza tal-kompjuter ma '10 snin ta 'programmazzjoni taħt ċinturin tiegħek

889
00:45:02,890 --> 00:45:05,640
u qed ifittxu biex jimlew dawn il-lakuni u li jkollhom aktar formali,

890
00:45:05,640 --> 00:45:07,370
minflok awto-mgħallma, taħriġ, forsi.

891
00:45:07,370 --> 00:45:10,410
Tirrealizza li hemm demografika sostanzjali ħafna fl-

892
00:45:10,410 --> 00:45:13,090
klassi li għandha l preċiżament dak istess għan.

893
00:45:13,090 --> 00:45:14,320
Int ser ikollok ħamest ijiem tard.

894
00:45:14,320 --> 00:45:16,490
Settijiet Problema huma ġeneralment dovuti nhar ta 'Ħamis, imma int tista'

895
00:45:16,490 --> 00:45:18,440
jestendu ħamsa minn dawk l-iskadenzi użu ta 'dawn

896
00:45:18,440 --> 00:45:19,700
affarijiet imsejħa jum tard.

897
00:45:19,700 --> 00:45:22,590
U aħna ser qatra wkoll punteġġ aktar baxx tiegħek fl-aħħar ta 'l-

898
00:45:22,590 --> 00:45:25,400
semestru kull l-partikolaritajiet fil-sillabu.

899
00:45:25,400 --> 00:45:27,800
>> Iżda ieħor karatteristika li tiddefinixxi l CS50 fuq

900
00:45:27,800 --> 00:45:29,830
is-snin saret ħinijiet tal-uffiċċju.

901
00:45:29,830 --> 00:45:32,720
Huwa opportunità li inti raw viżwalment fil-ritratti daqsxejn

902
00:45:32,720 --> 00:45:35,850
ilu li aħna niġbru - qabel fil dining dar

903
00:45:35,850 --> 00:45:37,780
swali, qabel li fil-kantina ta 'l-Xjenza

904
00:45:37,780 --> 00:45:40,310
Center, u din is-sena Annenberg Hall - erbat iljieli a

905
00:45:40,310 --> 00:45:43,330
ġimgħa 20:00-11:00 fejn inti ser ikollok dan ħafna

906
00:45:43,330 --> 00:45:46,320
ħafna esperjenza maqsuma ta 'ħidma fuq, tissara

907
00:45:46,320 --> 00:45:49,300
permezz, ċerti problemi, iżda bi appoġġ sostanzjali

908
00:45:49,300 --> 00:45:50,380
istruttura fil-post.

909
00:45:50,380 --> 00:45:53,180
Tabilħaqq, il-mod kif dan se taħdem hija li inti ser jaslu Annenberg

910
00:45:53,180 --> 00:45:55,160
jekk ikollok xi mistoqsija matul il-ġimgħa, inti ser iġġib

911
00:45:55,160 --> 00:45:58,060
laptop tiegħek, inti ser joqogħdu bilqegħda, grab xi ikel, u tkun taf log

912
00:45:58,060 --> 00:46:01,520
fis CS50 Iddiskuti, utilità web-based li t-tagħlim

913
00:46:01,520 --> 00:46:04,480
persunal żviluppat li se jippermetti li inti post mistoqsijiet

914
00:46:04,480 --> 00:46:07,910
u ara follow-ups fil-forum ta 'diskussjoni tipiku

915
00:46:07,910 --> 00:46:10,550
sens, jużaw tikketti u oġġetti simili u auto komplet biex

916
00:46:10,550 --> 00:46:11,680
tfittix fid-data.

917
00:46:11,680 --> 00:46:14,850
Imma inti ser tkun kapaċi wkoll li, matul il-ħinijiet tal-uffiċċju

918
00:46:14,850 --> 00:46:16,980
siegħa, għandhom mistoqsijiet tiegħek tiżdied għal

919
00:46:16,980 --> 00:46:18,360
bnedmin attwali.

920
00:46:18,360 --> 00:46:21,430
Tabilħaqq, l-għan, finalment, huwa hekk li wieħed, aħna jibdew jibnu

921
00:46:21,430 --> 00:46:24,040
up matul il-kors tas-semestru 'korp ta nisperaw

922
00:46:24,040 --> 00:46:26,970
informazzjoni tassew utli, tweġibiet komuni għal komuni

923
00:46:26,970 --> 00:46:29,640
mistoqsijiet, b'tali mod li inti stess tista 'ssolvi l-problemi

924
00:46:29,640 --> 00:46:33,490
u jiksbu tinqala kemm jista 'jkun malajr, iżda filwaqt li l-

925
00:46:33,490 --> 00:46:37,210
għalliema, normalment 20 u 30 mill-riċerkaturi tagħlim u

926
00:46:37,210 --> 00:46:39,660
kors assistenti, fuq il-persunal mill-ewwel.

927
00:46:39,660 --> 00:46:42,420
>> Se jkollna dak li jissejjaħ il-greeter CS50 fil Annenberg.

928
00:46:42,420 --> 00:46:46,710
U meta aħna jiddetermina li, inti taf liema, din il-kwistjoni,

929
00:46:46,710 --> 00:46:48,780
ma nistgħux verament twieġeb b'mod effettiv online.

930
00:46:48,780 --> 00:46:49,800
Għandna bżonn biex tara kompjuter tiegħek.

931
00:46:49,800 --> 00:46:50,710
Aħna rridu biex jitkellem miegħek one-on-one.

932
00:46:50,710 --> 00:46:51,340
Fuq naħa waħda.

933
00:46:51,340 --> 00:46:53,400
Int verament jitħabtu u int, għalhekk, trid titkellem

934
00:46:53,400 --> 00:46:56,010
one-on-one flimkien xi ħadd, inti ser tkun mibgħuta lill-

935
00:46:56,010 --> 00:46:58,730
CS50 greeter, f'azjenda sħabi tagħlim, litteralment, l-

936
00:46:58,730 --> 00:47:01,770
iPad li għandha ismijiet istudenti fuq naħa waħda, tagħlim tal-persunal

937
00:47:01,770 --> 00:47:02,790
ismijiet fuq l-oħra.

938
00:47:02,790 --> 00:47:04,760
Aħna se ikklikkja l-isem tiegħek segwit mill-isem ta '

939
00:47:04,760 --> 00:47:06,860
għalliema, u l-iskrin tal-kompjuter tiegħek se tibda

940
00:47:06,860 --> 00:47:11,170
jekk jogħġbok Teptip qal tmur tara Alice jew jekk jogħġbok mur ara Bob fuq

941
00:47:11,170 --> 00:47:11,980
il-mejda tal-persunal.

942
00:47:11,980 --> 00:47:14,450
U hekk b'dan il-mod, se nkunu kapaċi dispaċċ affarijiet kif

943
00:47:14,450 --> 00:47:17,610
effiċjenti possibbli, kif ukoll niggwidawk lejn

944
00:47:17,610 --> 00:47:19,910
soluzzjonijiet l-aktar faċilment.

945
00:47:19,910 --> 00:47:22,970
Fil-sezzjonijiet, dawn se jkunu l-opportunitajiet għal aktar

946
00:47:22,970 --> 00:47:25,570
idejn fuq intima opportunitajiet ma 'wieħed mill-

947
00:47:25,570 --> 00:47:29,040
tagħlim fellows u 12 sa 16 jew hekk ta 'klassi tiegħek fl-

948
00:47:29,040 --> 00:47:31,900
li kull ġimgħa aħna ser ikollhom problemi fis-sett problema

949
00:47:31,900 --> 00:47:33,800
li titlob numru ta 'mistoqsijiet kunċettwali u

950
00:47:33,800 --> 00:47:35,740
numru ta 'mistoqsijiet programmazzjoni bit daqs li inti

951
00:47:35,740 --> 00:47:37,690
tista figura fuq tiegħek, u inti tista 'taħdem fuq tiegħek

952
00:47:37,690 --> 00:47:40,020
stess, iżda fil-kuntest tat-taqsima fejn naħdmu permezz

953
00:47:40,020 --> 00:47:42,870
kollettivament xi wħud minn dawk il-problemi u jmorru fejn l-

954
00:47:42,870 --> 00:47:44,570
konverżazzjoni differenti Iqarribna.

955
00:47:44,570 --> 00:47:48,010
>> Barra minn hekk, fis-sezzjoni ser ikollok opportunitajiet biex

956
00:47:48,010 --> 00:47:50,450
tirrevedi s-sottomissjonijiet ta 'dar li inti stajt magħmula, tiegħek

957
00:47:50,450 --> 00:47:53,620
klassi, xi kultant anonimizzata, dejjem permezz opt-in

958
00:47:53,620 --> 00:47:55,810
jekk inti tixtieq li jaqsmu x-xogħol li inti stajt sottomessi.

959
00:47:55,810 --> 00:47:58,030
Għalhekk se verament tkun konverżazzjoni bi-direzzjonali,

960
00:47:58,030 --> 00:48:00,840
opportunità biex jirrevedu x-xogħol tiegħek b'mod aktar ferm

961
00:48:00,840 --> 00:48:04,080
sens dinamiku, aktar milli sempliċiment tħares lejn PDF jew

962
00:48:04,080 --> 00:48:06,920
printout u l-ħsieb dwar dan għal ftit sekondi u mhux

963
00:48:06,920 --> 00:48:08,920
neċessarjament jassorbu l-feedback li t-tagħlim

964
00:48:08,920 --> 00:48:10,150
persunal pprovdew.

965
00:48:10,150 --> 00:48:12,540
U inti ser tuża għodda hawn imsejjaħ CS50 Spazji.

966
00:48:12,540 --> 00:48:15,670
Għal dawk familjari, dan huwa l-lingwa magħrufa bħala C fil-quċċata

967
00:48:15,670 --> 00:48:17,500
xellug, u int ser tingħata biex tkun taf dan iż-żmien fuq.

968
00:48:17,500 --> 00:48:19,640
Iżda dan huwa utilità fuq l-internet li aħna ser tuża fil

969
00:48:19,640 --> 00:48:22,310
taqsima li se jippermetti li inti u l-15 tiegħek jew hekk klassi

970
00:48:22,310 --> 00:48:24,100
li login ma 'sħabi tagħlim tiegħek fil-

971
00:48:24,100 --> 00:48:24,980
quddiem tal-kamra.

972
00:48:24,980 --> 00:48:26,750
Int ser tkun kapaċi li jikteb il-kodiċi f'dan il-tieqa.

973
00:48:26,750 --> 00:48:28,720
Int ser tkun tista 'chat elettroniku, jekk int ma

974
00:48:28,720 --> 00:48:30,930
fil-fatt fit-taqsima f'dak il-mument partikolari.

975
00:48:30,930 --> 00:48:33,940
U tiegħek tagħlim sħabi, meta niġu żmien biex jiddiskutu

976
00:48:33,940 --> 00:48:38,645
Tal-Alice jew soluzzjoni Bob fil-klassi, il-kollegi tagħlim jista

977
00:48:38,645 --> 00:48:41,380
ikklikkja l-buttuna u voila, proġett fuq l-iskrin,

978
00:48:41,380 --> 00:48:44,250
tkun xi tkun li student ilha taħdem fuq dak partikolari

979
00:48:44,250 --> 00:48:44,990
punt fil-ħin.

980
00:48:44,990 --> 00:48:47,130
Allura għal dawk fostkom li għadhom ħbieb li ħadu CS50 fil

981
00:48:47,130 --> 00:48:49,750
il-passat, tirrealizza li sezzjonijiet kienu sinifikament

982
00:48:49,750 --> 00:48:52,600
fasslu din is-sena li jkun l-aktar attivi, l-aktar

983
00:48:52,600 --> 00:48:55,960
dinamika, u verament konverżazzjoni żewġ naħat bejn tagħlim

984
00:48:55,960 --> 00:48:58,190
persunal u l-istudenti.

985
00:48:58,190 --> 00:48:59,020
>> U walkthroughs.

986
00:48:59,020 --> 00:49:01,560
Allura għal dawn is-settijiet problema, noffru wkoll mhux biss il-

987
00:49:01,560 --> 00:49:04,210
ispeċifikazzjoni innifsu, li huwa ġeneralment pjuttost dettaljata

988
00:49:04,210 --> 00:49:07,380
PDF, imma wkoll affarijiet magħrufa bħala walkthroughs fejn wieħed

989
00:49:07,380 --> 00:49:11,000
membru tal-persunal tal-għalliema se jwassal għal sessjoni ta 'kull ġimgħa

990
00:49:11,000 --> 00:49:13,210
li litteralment mixjiet inti permezz-sett problema, li tagħti

991
00:49:13,210 --> 00:49:15,720
inti ħjiel u pariri u punti ta 'tluq u hija maħsuba

992
00:49:15,720 --> 00:49:17,250
li titlob lill-staqsa ħafna drabi

993
00:49:17,250 --> 00:49:19,360
kwistjoni, fejn nista tibda?

994
00:49:19,360 --> 00:49:21,990
Ukoll, inti tibda jew mill għadis fil-spec fuq tagħha

995
00:49:21,990 --> 00:49:25,100
stess jew billi jattendi jew jaraw dawn walkthroughs.

996
00:49:25,100 --> 00:49:27,420
L-walkthrough ewwel, fil-fatt, se tkun din il-ġimgħa.

997
00:49:27,420 --> 00:49:29,520
Huma ser ikunu nhar ta 'Ġimgħa, mhux tant għaliex aħna naħsbu li ser tkun

998
00:49:29,520 --> 00:49:32,160
żmien popolari iżda għaliex nistgħu mbagħad film minnhom kmieni ħafna

999
00:49:32,160 --> 00:49:34,380
fil-ġimgħa biex tikseb minnhom online mill-weekend sabiex inti

1000
00:49:34,380 --> 00:49:37,670
jkollhom bħala ħafna ġranet jista 'jkun li fil-fatt jidħlu f'dik

1001
00:49:37,670 --> 00:49:38,390
kontenut ukoll.

1002
00:49:38,390 --> 00:49:40,900
Iżda aktar fuq li fil lecture din il-ġimgħa.

1003
00:49:40,900 --> 00:49:43,620
>> Issa f'termini tal-istruttura ta 'appoġġ, l-aktar

1004
00:49:43,620 --> 00:49:46,430
istatistika sinifikanti hija forsi l-tagħlim 108

1005
00:49:46,430 --> 00:49:47,950
fellows u l-assistenti kors li dan

1006
00:49:47,950 --> 00:49:49,730
kors bħalissa għandha.

1007
00:49:49,730 --> 00:49:52,030
Jekk xi wħud minnkom li ma jkollhom klassijiet konfliġġenti tixtieq

1008
00:49:52,030 --> 00:49:55,070
biex jissieħbu me up here fuq il-palk, huwa dawn guys li se

1009
00:49:55,070 --> 00:49:57,990
finalment verament jiddefinixxu l-esperjenza tiegħek fil-kors.

1010
00:50:06,750 --> 00:50:09,290
I kellhom ħafna fellows tagħlim tagħlim me klassijiet fl

1011
00:50:09,290 --> 00:50:11,650
il-jum, u I remember ftit ta 'dawk franchement.

1012
00:50:11,650 --> 00:50:15,590
Iżda sal-lum, I still remember fost dawk il-ftit, CS50 TF tiegħi

1013
00:50:15,590 --> 00:50:18,100
li verament għenuni jwieġbu l-mistoqsijiet, li verament għenu

1014
00:50:18,100 --> 00:50:20,690
meta me I kien tissara, u verament kien sieħeb f'din

1015
00:50:20,690 --> 00:50:23,630
esperjenza ta 'tagħlim ta' dinja ġdid ħafna.

1016
00:50:23,630 --> 00:50:26,410
Fi ftit, kollha ta 'dawn guys se jingħaqdu miegħek barra għal

1017
00:50:26,410 --> 00:50:29,010
kejk, li hija tradizzjoni ta 'CS50, fil-kappelluni tal

1018
00:50:29,010 --> 00:50:30,030
Memorial Hall.

1019
00:50:30,030 --> 00:50:32,320
>> Imma ippermettuli ewwel li jintroduċu inti biex Nate

1020
00:50:32,320 --> 00:50:35,820
Hardison, għal darb'oħra, Rob Bowden, u Tommy MacWilliam, dan

1021
00:50:35,820 --> 00:50:37,460
Naturalment is-sena kapijiet.

1022
00:50:37,460 --> 00:50:39,250
Jekk inti guys se jissieħbu miegħi hawn fin-nofs.

1023
00:50:45,250 --> 00:50:47,910
Huma kollha ppreparati xi rimarki inspirational.

1024
00:50:51,540 --> 00:50:52,550
>> Tommy MacWilliam: I ma tipprepara xejn

1025
00:50:52,550 --> 00:50:53,665
inspirational.

1026
00:50:53,665 --> 00:50:55,020
Imma jien jisimni Tommy.

1027
00:50:55,020 --> 00:50:56,140
I'ma anzjan fl Mather.

1028
00:50:56,140 --> 00:50:57,325
Jien jistudjaw ix-xjenza tal-kompjuter.

1029
00:50:57,325 --> 00:50:59,490
Ninsab verament eċċitati li jkun fuq it-tim hedge u li jmorru

1030
00:50:59,490 --> 00:51:01,365
permezz tal-vjaġġ CS50 miegħek.

1031
00:51:01,365 --> 00:51:04,010
What I really love dwar CS50 huwa kif verament tgħallem inti

1032
00:51:04,010 --> 00:51:06,040
biex jaħsbu dwar il-problemi b'mod ġdid.

1033
00:51:06,040 --> 00:51:08,570
Dan huwa verament ħila li gonna tkun imprezzabbli ebda kwistjoni

1034
00:51:08,570 --> 00:51:09,950
liema qasam tmur fis.

1035
00:51:09,950 --> 00:51:12,660
U mhux biss dik, iżda noffru aktar kandju ħielsa minn kwalunkwe

1036
00:51:12,660 --> 00:51:13,910
kors ieħor fuq il-kampus.

1037
00:51:20,088 --> 00:51:22,210
Yeah, u hekk jien verament bil-ħerqa li jara liema

1038
00:51:22,210 --> 00:51:23,560
kulħadd jibni dan is-semestru.

1039
00:51:23,560 --> 00:51:25,730
U jekk xi ħadd ikollu xi mistoqsijiet issa jew matul

1040
00:51:25,730 --> 00:51:27,770
il-semestru, definittivament tħossok liberu li jilħqu lili u

1041
00:51:27,770 --> 00:51:29,020
I d jkunu kuntenti li jgħinu.

1042
00:51:31,450 --> 00:51:31,780
>> ROB Bowden: Hi.

1043
00:51:31,780 --> 00:51:32,530
Jien Rob Bowden.

1044
00:51:32,530 --> 00:51:33,780
I'ma anzjan fl Kirkland.

1045
00:51:37,900 --> 00:51:39,760
Yeah, li d-dritt.

1046
00:51:39,760 --> 00:51:41,930
Aħna kollha verament eċċitati għal dan is-semestru li jmiss.

1047
00:51:41,930 --> 00:51:43,230
Nittamaw li inti qed kollha eċċitati.

1048
00:51:47,710 --> 00:51:49,410
I ma kienx jistennew dan.

1049
00:51:49,410 --> 00:51:50,390
Yeah.

1050
00:51:50,390 --> 00:51:52,200
Allura aħna mressqa tant sforz fis-teħid din

1051
00:51:52,200 --> 00:51:53,370
verament kbir semestru.

1052
00:51:53,370 --> 00:51:55,960
U sakemm int lesti li jqiegħdu fil-isforz, hemm

1053
00:51:55,960 --> 00:51:57,840
tant inti tista 'tikseb minn dan il-kors.

1054
00:51:57,840 --> 00:52:00,130
Ah, aħna -

1055
00:52:00,130 --> 00:52:01,380
yeah.

1056
00:52:04,640 --> 00:52:08,300
Tista 'tikseb lott ta' gost ta 'dan il-kors.

1057
00:52:08,300 --> 00:52:10,500
Aħna ma jkollhomx persunal ta '108 jekk inti ma setgħux jiksbu lott

1058
00:52:10,500 --> 00:52:11,370
ta 'gost minnha.

1059
00:52:11,370 --> 00:52:15,300
Għalhekk, biss jippruvaw li jkun involut u int mhux se jiddispjaċina minnu.

1060
00:52:23,190 --> 00:52:23,890
>> Nate HARDISON: Hi, guys.

1061
00:52:23,890 --> 00:52:24,800
Jien Nate.

1062
00:52:24,800 --> 00:52:27,570
Jien l-preceptor għall-kors.

1063
00:52:27,570 --> 00:52:29,060
Ninsab verament eċċitati li jkun hawn ukoll.

1064
00:52:29,060 --> 00:52:30,960
Din hija l-ewwel sena tiegħi hawn.

1065
00:52:30,960 --> 00:52:34,210
Nispera li intom kollha jieħdu dan il-kors u jgawdu minnha kemm

1066
00:52:34,210 --> 00:52:35,820
Stajt jgawdu minnu s'issa.

1067
00:52:35,820 --> 00:52:38,570
U jekk inti qatt tixtieq li jitgħallmu kif jgħodd sa 9 jew 10 fl-

1068
00:52:38,570 --> 00:52:41,730
binarja, come tkellem lili.

1069
00:52:41,730 --> 00:52:43,760
>> DAVID J. Malan: Allura bir-riskju li jitilqu dawn guys hawn fuq

1070
00:52:43,760 --> 00:52:46,980
istadju daqsxejn awkwardly, ejja whirl permezz biss ftit ta '

1071
00:52:46,980 --> 00:52:49,370
l-affarijiet li tistenna qabel we jiddifferixxi għall-kejk.

1072
00:52:49,370 --> 00:52:50,580
X'inhu dak li tinsab quddiem?

1073
00:52:50,580 --> 00:52:53,490
Ukoll, jekk nieħdu ħarsa lura lejn is-sena li għaddiet, fil-problema

1074
00:52:53,490 --> 00:52:56,010
stabbiliti 0, predeċessuri tiegħek dove ġo programmazzjoni

1075
00:52:56,010 --> 00:52:58,700
lingwa imsejħa Scratch, lingwa ta 'programmar grafika

1076
00:52:58,700 --> 00:53:01,220
inti ser tuża fl-ewwel jiem tal-kors jibda dan

1077
00:53:01,220 --> 00:53:04,390
Il-ġimgħa biex jitgħallmu xi kunċetti familjari għal xi wħud minnkom.

1078
00:53:04,390 --> 00:53:06,750
Imma tirrealizza se jkun hemm aspett avvanzata ta 'dan għall-

1079
00:53:06,750 --> 00:53:08,950
dawk tal inti bi sfond qabel.

1080
00:53:08,950 --> 00:53:11,450
>> Fl-problema sena li għaddiet sett 2, l-istudenti dove fil-

1081
00:53:11,450 --> 00:53:14,780
dinja tal-kriptografija, l-arti tal enciphering jew scrambling

1082
00:53:14,780 --> 00:53:17,770
, programmi li jimplimentaw l-informazzjoni li d-data encrypted.

1083
00:53:17,770 --> 00:53:21,490
U fil-żieda Hacker aħħar sena ma studenti jipproċedi

1084
00:53:21,490 --> 00:53:24,570
biex jitwaqqaf jew jiddekowdja-passwords fi tipiku

1085
00:53:24,570 --> 00:53:28,090
kompjuter password xe fajl billi toħroġ ma 'algoritmi u

1086
00:53:28,090 --> 00:53:31,810
heuristics għal forza brutali jidhru xi ħadd dak li

1087
00:53:31,810 --> 00:53:33,640
password fuq sistema tal-kompjuter kien.

1088
00:53:33,640 --> 00:53:36,630
Sena li għaddiet, ukoll, fil-problema stabbiliti 3, ma studenti implikazzjonijiet - fil

1089
00:53:36,630 --> 00:53:37,680
problema stabbiliti 4 - studenti għamlet

1090
00:53:37,680 --> 00:53:39,280
timplimenta l-logħba tal Sudoku.

1091
00:53:39,280 --> 00:53:42,250
U fil-żieda Hacker dik is-sena ma l-istudenti mhux

1092
00:53:42,250 --> 00:53:45,650
biss jimplimentaw kif jilagħbu l-logħba, imma attwalment solver

1093
00:53:45,650 --> 00:53:47,800
fejn il-kompjuter jistgħu jagħtuk, il-bniedem, ma

1094
00:53:47,800 --> 00:53:50,130
ħjiel minn aktar malajr milli inti stajt jissolvew

1095
00:53:50,130 --> 00:53:51,420
li partikulari il-problema.

1096
00:53:51,420 --> 00:53:54,130
>> Fil sett problema 5, għamilna forensika, din l-arti tal-

1097
00:53:54,130 --> 00:53:57,020
tirkupra l-informazzjoni li kienet aċċidentalment jew ħafna

1098
00:53:57,020 --> 00:53:59,320
deliberatament imħassra minn kompjuter.

1099
00:53:59,320 --> 00:54:02,100
Sena li għaddiet, il-persunal tat-tagħlim u I strolled madwar il-kampus

1100
00:54:02,100 --> 00:54:04,990
jieħdu ritratti ta 'nies, postijiet, u l-affarijiet, u mbagħad

1101
00:54:04,990 --> 00:54:07,830
aċċidentalment ifformattjat l-karta tal-midja fuq camera tagħna li

1102
00:54:07,830 --> 00:54:08,900
kellhom dawk kollha ritratti.

1103
00:54:08,900 --> 00:54:09,650
Imma l-ebda problema.

1104
00:54:09,650 --> 00:54:13,780
Għamilna immaġini forensika ta 'dan il-biljett tal-midja, mogħtija out

1105
00:54:13,780 --> 00:54:16,320
għall-istudenti kollha fil-klassi, u kkontestat li jiktbu

1106
00:54:16,320 --> 00:54:20,110
programmi li rkuprati kollha tal-JPEGs minn dik il-karta.

1107
00:54:20,110 --> 00:54:22,010
U dan huwa attwalment wieħed ta 'settijiet tagħna problema favoriti.

1108
00:54:22,010 --> 00:54:24,680
>> U I dug up fl-email minn wieħed mill-predeċessuri tiegħek,

1109
00:54:24,680 --> 00:54:27,270
li kien gost kbir biex jinqraw f'xi ilu.

1110
00:54:27,270 --> 00:54:30,240
Huwa kiteb - dan huwa minn Matt - qalb David, il-bieraħ tiegħi

1111
00:54:30,240 --> 00:54:33,710
sister aċċidentalment ifformattjat kamera żewġha karta SD u mitlufa

1112
00:54:33,710 --> 00:54:35,630
jiswew is-sena ta 'ritratti memorabbli.

1113
00:54:35,630 --> 00:54:38,710
Hija sfortunatament mhuwiex l-aħjar fil-appoġġ ta 'data tagħha.

1114
00:54:38,710 --> 00:54:41,230
Iżda din is-sitwazzjoni mfakkra me tal pset 5, hekk ħsibt I

1115
00:54:41,230 --> 00:54:44,260
se jipprova jiddekorri karta SD tagħha permezz tal-programm tirkupra

1116
00:54:44,260 --> 00:54:46,310
li I kiteb it-triq kollha lura f'Ottubru.

1117
00:54:46,310 --> 00:54:48,550
Allura wara erba 'sigħat ta jidhru kif tinħoloq

1118
00:54:48,550 --> 00:54:51,210
immaġni prima mill-karta SD ifformattjat -

1119
00:54:51,210 --> 00:54:53,370
Google ppruvat li jkun pjuttost ebda għajnuna f'dan ir-rigward sal-

1120
00:54:53,370 --> 00:54:55,480
Ironikament I ġara li jiltaqgħu istruzzjonijiet tiegħek fuq

1121
00:54:55,480 --> 00:54:58,070
l-Internet -

1122
00:54:58,070 --> 00:55:00,490
wara tbagħbis madwar ma 'wħud mill-argumenti kmand,

1123
00:55:00,490 --> 00:55:02,320
I irnexxielhom joħolqu l-immaġini forensika.

1124
00:55:02,320 --> 00:55:04,490
U wara l-installazzjoni u l-konfigurazzjoni l-CS50

1125
00:55:04,490 --> 00:55:07,520
Appliance, I ġestiti biex imexxu l-immaġini forensika permezz tiegħi

1126
00:55:07,520 --> 00:55:13,110
programm u tirkupra kollha 1027 ta 'ritratti sister tiegħi.

1127
00:55:13,110 --> 00:55:14,340
Dritt, Matt.

1128
00:55:14,340 --> 00:55:15,165
>> Għalhekk fl-aħħar year's -

1129
00:55:15,165 --> 00:55:23,080
[Applause]

1130
00:55:23,080 --> 00:55:25,680
Fil sett problema sena li għaddiet 6, aħna taw l-istudenti ta '

1131
00:55:25,680 --> 00:55:29,910
dizzjunarju ta '150,000 kliem Ingliż u kkontestat biex

1132
00:55:29,910 --> 00:55:32,570
jiktbu jespliċitaw kontrollur li wieġeb mistoqsijiet tal-formola

1133
00:55:32,570 --> 00:55:33,930
huwa din il-kelma spjegati b'mod korrett jew

1134
00:55:33,930 --> 00:55:35,705
b'mod żbaljat malajr kemm jista 'jkun.

1135
00:55:35,705 --> 00:55:38,470
U fl-bażi opt-in kienu studenti jitħallew mbagħad

1136
00:55:38,470 --> 00:55:41,290
isfida klassi bl-affissjoni riżultati tagħhom, il-

1137
00:55:41,290 --> 00:55:44,200
ammont ta 'RAM li huma użati, in-numru ta' ċikli CPU jew

1138
00:55:44,200 --> 00:55:46,910
sekondi li huma użati, sabiex l-istudenti kienu mbagħad kklassifikati

1139
00:55:46,910 --> 00:55:47,900
fuq il-websajt tal-kors tal-.

1140
00:55:47,900 --> 00:55:51,170
Gost darb'oħra, l-aspett purament fakultattiva ta 'dan, imma kbira f'dak

1141
00:55:51,170 --> 00:55:54,540
ħafna drabi se student tikseb l-pożizzjoni numru 10 jew hekk

1142
00:55:54,540 --> 00:55:57,210
il-bord kbir fuq il-websajt, go off għall-pranzu, u mbagħad

1143
00:55:57,210 --> 00:55:59,920
terga 'lura u tirrealizza roommate tiegħu kien għadu kemm delineata fil

1144
00:55:59,920 --> 00:56:03,270
quddiem lilu jew lilha fuq il-bord kbar, u b'hekk tferriegħ ieħor

1145
00:56:03,270 --> 00:56:07,170
tnejn jew tliet sigħat biss għal wieħed up tiegħu jew roommate tagħha.

1146
00:56:07,170 --> 00:56:08,550
>> Allura aħna bil-ħerqa li xi ħaġa simili

1147
00:56:08,550 --> 00:56:09,580
din is-sena kif ukoll.

1148
00:56:09,580 --> 00:56:12,140
Fl-problema jistabbilixxu 7 aħna ma steer fid-direzzjoni ta 'web

1149
00:56:12,140 --> 00:56:14,840
programmazzjoni, fil-fatt soluzzjoni ta 'problemi fil-qatt

1150
00:56:14,840 --> 00:56:18,170
dejjem aktar ambjent komuni ta 'web browser.

1151
00:56:18,170 --> 00:56:20,900
Know decreasingly nistgħu download software fuq MACs u

1152
00:56:20,900 --> 00:56:23,650
PCs, iżda dejjem nagħmlu dan kollu fi ħdan il-web.

1153
00:56:23,650 --> 00:56:27,530
>> U fil-fatt is-sena li għaddiet, xi 88% tal-proġetti finali istudenti fl-

1154
00:56:27,530 --> 00:56:29,660
il-kors kienu web-based.

1155
00:56:29,660 --> 00:56:32,020
U dawk, ukoll, huma l-ħiliet li inti ser joħorġu minn din il-

1156
00:56:32,020 --> 00:56:33,230
klassi sa tmiem kors ta.

1157
00:56:33,230 --> 00:56:36,090
Minħabba dak li jistenna fl-aħħar kors huwa l-Fiera CS50,

1158
00:56:36,090 --> 00:56:39,060
din il-wirja li bbażat fuq l-idea ta 'fiera tax-xjenza.

1159
00:56:39,060 --> 00:56:41,750
Iżda f'dan il-verżjoni ta 'suq jagħmlu l-istudenti kollha fil-klassi

1160
00:56:41,750 --> 00:56:45,400
iġibu laptops tagħhom u l-ħbieb u familja tagħhom u oħrajn

1161
00:56:45,400 --> 00:56:48,310
li Majjistral Xjenza, bini kbir fuq il-kampus, imwaqqaf

1162
00:56:48,310 --> 00:56:51,030
laptop tagħhom, nikseb xi ikel, nikseb xi popcorn u xorb,

1163
00:56:51,030 --> 00:56:53,990
u mbagħad juru proġetti finali tagħhom għal dawk kollha fil-

1164
00:56:53,990 --> 00:56:57,210
attendenza li aħħar sena nnumerati xi 2,500 attendew

1165
00:56:57,210 --> 00:56:58,320
minn madwar il-kampus.

1166
00:56:58,320 --> 00:57:02,100
U espressjonijiet bħal dan u bħal dan ma kinux

1167
00:57:02,100 --> 00:57:03,370
mhux komuni fil-fiera.

1168
00:57:03,370 --> 00:57:06,590
>> Li jwassal għall-fiera hija l-Hackathon CS50, l-opportunità

1169
00:57:06,590 --> 00:57:09,350
li ħops fuq shuttle Harvard, ras fl-triq biex

1170
00:57:09,350 --> 00:57:12,700
Microsoft fi 8:00 PM, u mhux tmur id-dar sakemm 07:00.

1171
00:57:12,700 --> 00:57:16,280
Aħna iservu pranzu 1 fi 8:00 PM, pranzu 2 fi 1:00 AM,

1172
00:57:16,280 --> 00:57:18,900
u għal dawk li għadhom wieqfa fi 5:00 AM, nittrattaw li

1173
00:57:18,900 --> 00:57:20,400
pancakes fil IHOP.

1174
00:57:20,400 --> 00:57:23,470
U l-Hackathon hija opportunità, kif isaffru hawn,

1175
00:57:23,470 --> 00:57:25,930
li adsa fi proġetti finali tiegħek, kemm jekk jaħdmu fuq

1176
00:57:25,930 --> 00:57:29,470
tiegħek jew mal-ħbieb f'ambjent kollaborattiv,

1177
00:57:29,470 --> 00:57:31,970
fejn l-għalliema kollha qed jaħdem sew fil-

1178
00:57:31,970 --> 00:57:35,430
lejl bi provvista abbundanti ta 'ikel Ċiniż Ħong Kong.

1179
00:57:35,430 --> 00:57:39,550
Fl 05:00 Se immaġni bħal dawn ikunu pjuttost komuni f'dan

1180
00:57:39,550 --> 00:57:40,940
sena kif ukoll.

1181
00:57:40,940 --> 00:57:44,390
>> Allura kif aħna jaġġorna fil-mument ta 'kejk, iżomm f'moħħu li

1182
00:57:44,390 --> 00:57:48,500
76% tal-poplu f'dan il-kamra jkollha l-ebda esperjenza preċedenti.

1183
00:57:48,500 --> 00:57:51,090
U kif kull l-sillabu, dak li finalment jgħodd f'dan

1184
00:57:51,090 --> 00:57:53,740
Naturalment huwa mhux tant fejn inti tispiċċa relattiva għall tiegħek

1185
00:57:53,740 --> 00:57:57,400
klassi, imma fejn inti fi 11 ġimgħa jispiċċaw relattiva għal

1186
00:57:57,400 --> 00:57:59,400
ruħek fil-ġimgħa 0.

1187
00:57:59,400 --> 00:58:01,850
Dan huwa CS50.