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[Powered by Google Translate] Vipul Shekhawat: Hi.

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F'dan il-video I ser tkun introduzzjoni inti wieħed mill-aktar

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kunċetti fundamentali fil-loġika u l-

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programmazzjoni, il-valur Boolean.

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Jekk int kurjuż dwar l-isem, il-valuri Boolean u

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kondizzjonijiet huma msemmija wara George Boole, seklu 19

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matematiku li pijunieri dik li issa tissejjaħ Boolean

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loġika, li hija bbażata mill-grupp u

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paragun tal-valuri Boolean.

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>> Allura dak li huwa valur Boolean?

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Valur Boolean hija varjabbli li biss għandha żewġ possibbli

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kundizzjonijiet, vera u falza.

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Inti tista 'taħseb li bħala switch tad-dawl.

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Dan jista 'jkun jew fuq jew barra, vera jew falza.

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Bl-istess mod, in-numri binarju jista 'jkun jew waħda jew żero, li

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hija analoga għall-istess ħaġa, vera jew falza.

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Sempliċi, id-dritt?

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Il-kunċett ta 'varjabbli Boolean huwa faċli biex

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jifhmu, iżda l-modi li bihom tista 'timmanipola u

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għaqqadhom jippermetti għal ħafna ta 'komplessità ikbar.

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Minbarra l-żewġ valuri Boolean fundamentali,

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hemm operaturi Boolean ħafna li jistgħu jgħaqqdu 2

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Valuri Boolean fi wieħed.

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>> Tnejn mill-aktar bażika, iżda l-aktar importanti

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operaturi, huma U u JEW.

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Riżultati Il U operatur fil-valur ta 'veru biss jekk iż-żewġ

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il-valuri li tieħu huma veri, sabiex falza U vera hija falza.

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Bl-istess mod, falza U foloz hija falza.

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Biss vera U veru ugwali veru.

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Ir-riżultati operatur JEW fil-valur ta 'veru jekk jew ta' l-

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Valuri li tieħu huma veri.

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Allura falza OR foloz hija falza, imma veru OR falza hija vera, u

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vera OR veru huwa veru ukoll.

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L-operatur MHUX sempliċiment tieħu varjabbli Boolean u jagħti

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inti l-oppost ta 'dan.

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Allura veru isir falza u qarrieqa isir veru.

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Jekk inti tpoġġi l-ħaġa sħiħa flimkien, varjabbli bi

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operaturi, inti toħloq espressjoni Boolean.

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>> Issa ejja nħarsu lejn eżempju ta 'nesting dawn Boolean

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espressjonijiet.

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Do you remember-ordni ta 'l-operazzjonijiet?

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Bħal numri, l-espressjonijiet Boolean jistgħu jiġu raggruppati skond

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jużaw parentesi.

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Allura hemm bażikament tliet espressjonijiet hawn, MHUX z, y JEW

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MHUX z, u x y U JEW MHUX z.

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Nistgħu insemmu l-valuri ta 'dawn billi tħares lejn il-

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ġewwa u tax-xogħol mod tagħna out.

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Mela ejja nassumu x huwa veru, y hija vera, u z huwa veru ukoll.

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Liema MHUX z jevalwa għall?

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Minħabba li aħna tibda bil veru, MHUX z sempliċiment tkun falza.

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Allura issa għandna falza JEW y.

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Jekk inti tħares fuq, tista 'tara li y hija vera, y JEW falza

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xorta biss ikunu vera.

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Fl-aħħar nett aħna, għandna x U vera.

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Allura x'hemm x U vera?

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x hija vera u vera huwa minnu wkoll, sabiex dan kollu ħaġa

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jevalwa l-veru.

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>> Sussegwentement, ejja nħarsu lejn kif dawn l-espressjonijiet Boolean jistgħu

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fil-fatt jintużaw fil-lingwa ta 'programmar.

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Fl C, il-sintassi għall-operazzjonijiet Boolean huwa daqsxejn differenti

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mill-kliem u, jew, u mhux.

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Ejja tkopri l-sintassi.

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Biex tuża l-operatur U, aħna jiktbu ampersand doppja.

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L-operatur OR huwa karattru doppju linja tal-pajpijiet.

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Dan huwa l-linja vertikali dritta, li inti tista 'probabbilment

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isibu l fuq mill-Enter jew Ritorn ċwievet fuq it-tastiera tiegħek.

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U l-operatur MHUX huwa sempliċement marka exclamation.

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Allura biex jikteb l-espressjoni kellna qabel, nixtiequ biss

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tikteb dan && x y | |! z.

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Li jinsab biss tieħu eżattament dak li kellna qabel u t-tidwir

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fis sintassi C.

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>> Issa li konna tradotti espressjoni Boolean tagħna fis-kodiċi,

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kif nistgħu attwalment jużaw dan?

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Ejja ngħidu li għandna xi kodiċi li għandhom biss tesegwixxi jekk

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espressjoni ċerti huwa veru.

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Għal dan il-għan, pretty ħafna kollha ipprogrammar ta 'lingwi

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jappoġġjaw il-kundizzjoni jekk.

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Ejja ngħidu aħna għandna varjabbli Boolean, x, u aħna rridu xi

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kodiċi li jesegwixxi biss jekk x huwa veru.

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Aħna se sempliċement jiktbu l-kelma jekk, tpoġġi parentesi, u mqiegħda

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l-espressjoni Boolean fi ħdan dawk parentesi.

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Wara dan, aħna nagħlaq il-kodiċi li rridu

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jwettaq fit ċineg kaboċċi.

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X'jiġri jekk hemm xi kodiċi tixtieq

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tesegwixxi jekk x mhux veru?

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Simply jiktbu l-kelma inkella wara l-istqarrija jekk, wrap

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il-kodiċi oħra ċineg kaboċċi, u mbagħad dan il-kodiċi se

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tesegwixxi jekk x mhux veru.

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>> Ieħor tibni lingwa utli hija ħaġa oħra jekk.

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Ejja ngħidu hemm żewġ Booleans tixtieq li jikkunsidraw,

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ejja jsejħulhom xuy.

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Aħna niddikjaraw dawn il-varjabbli li jkun veru u falz.

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Jekk xuy huma veri, inti teżegwixxi l-ewwel blokk ta '

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Kodiċi fi ħdan dawk ċineg kaboċċi.

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Inkella jekk x jew y huma veri, inti teżegwixxi l-blokk li jmiss ta '

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kodiċi, u inkella inti teżegwixxi l-aħħar blokka ta 'kodiċi.

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Ħidma mal-valuri Boolean bħal dan ikun utli, iżda

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int verament biss limitat għal ftit kundizzjonijiet.

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Booleans jista 'jsir ferm aktar b'saħħitha meta inti jintroduċu

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paraguni.

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Dawn huma modi biex iqabblu valuri li huma

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oriġinarjament ma Boolean.

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Biex tara jekk żewġ valuri huma l-istess, inti tista 'tuża ugwali

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ugwali, li huwa veru jekk dawn qed ugwali u falza, jekk

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dawn mhumiex.

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Paraguni komuni oħra huma inqas minn, akbar minn, inqas

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minn jew ugwali għal, u ikbar minn jew ugwali għal.

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>> Kollox stajt koperti s'issa kienet pjuttost astratta, sabiex

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ejja jintroduċu dawn il-paraguni fil-aħħar wieħed

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konkreti eżempju.

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Ejja ngħidu hemm żewġ fatturi varjabbli,

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temperatura u isHungry.

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Temperatura huwa numru b'punt li jvarja, u għalhekk jista 'jkollhom

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postijiet deċimali.

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Inti ipprogrammar ta 'applikazzjoni sempliċi ħafna li jirrakkonta

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xi ħadd dak li jieklu skond it-temperatura.

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Jekk int bil-ġuħ, U U t-temperatura hija akbar minn jew

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ugwali għal 100, inti tista 'jistampaw tiekol ġelat.

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Inkella jekk int bil-ġuħ U U t-temperatura hija inqas minn

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jew żero, tista 'printf ("jieklu ikel pikkanti").

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Fl-aħħar nett, jekk int ma ġuħ fil-livelli kollha, inti tista 'jistampaw "ma

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jieklu xejn. "

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>> I am Shekhawat Vipul, u dan huwa CS50.