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[Powered by Google Translate] VIPUL SHEKHAWAT: Hi.

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Katika video hii mimi itakuwa kuanzisha wewe moja ya wengi

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msingi dhana katika mantiki na

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programu, thamani Boolean.

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Kama wewe ni curious kuhusu jina, na maadili ya Boolean

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hali ni jina lake baada ya George Boole, karne ya 19

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Mwanahisabati ambaye alianzisha nini sasa inaitwa Boolean

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mantiki, ambayo ni msingi na kikundi hicho na

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kulinganisha maadili Boolean.

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>> Hiyo ni nini thamani Boolean?

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Thamani Boolean ni variable kwamba tu ana mbili iwezekanavyo

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hali ya kweli na uongo.

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Unaweza kufikiri ya kuwa kama swichi mwanga.

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Ni inaweza kuwa ama juu au mbali, kweli au uongo.

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Vile vile, binary idadi inaweza kuwa ama moja au sifuri, ambayo

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ni sawa na kitu kimoja, kweli au uongo.

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Rahisi, sawa?

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dhana ya kutofautiana Boolean ni rahisi

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kuelewa, lakini njia ambayo unaweza kuendesha na

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kuchanganya yao inaruhusu kwa kiasi ya utata mkubwa.

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Mbali na maadili mbili msingi Boolean,

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kuna wengi Boolean operators kwamba unaweza kuchanganya mbili

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Boolean maadili ndani ya moja.

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>> Mbili za msingi zaidi, lakini muhimu zaidi

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operators, ni NA na AU.

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NA operator matokeo katika thamani ya kweli tu kama wote wawili wa

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maadili inachukua ni kweli, hivyo uongo NA kweli ni uongo.

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Kadhalika, uongo NA uongo ni uongo.

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Pekee wa kweli na wa kweli sawa na kweli.

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AU operator matokeo katika thamani ya kweli kama aidha ya

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maadili inachukua ni kweli.

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Hivyo uongo AU uongo ni uongo, lakini ni kweli AU uongo ni kweli, na

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kweli kweli AU pia ni kweli.

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Operator NOT tu inachukua variable Boolean na anatoa

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wewe kinyume cha hivyo.

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Hivyo kweli inakuwa uongo na uongo kuwa kweli.

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Kama wewe kuweka jambo zima pamoja, vigezo na

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operators, wewe kujenga kujieleza Boolean.

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>> Sasa hebu tuangalie mfano wa Boolean nesting hizi

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misemo.

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Unakumbuka utaratibu wa shughuli?

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Kama na idadi, maneno Boolean inaweza kupangwa na

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kutumia mabano.

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Hivyo kuna kimsingi tatu maneno hapa, NOT z, AU y

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NOT z, na x NA y AU SIO z.

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Tunaweza kufikiri maadili ya hizi kwa kuangalia

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ndani na kufanya kazi kwa njia yetu nje.

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Basi hebu tuseme x ni kweli, y ni kweli, na z pia ni kweli.

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Nini NOT z kutathmini kwa?

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Tangu sisi kuanza na wa kweli, NOT z ingekuwa tu kuwa uongo.

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Hivyo basi, tuna uongo AU y.

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Kama ukiangalia juu, unaweza kuona kwamba y ni kweli, y AU uongo

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bado tu kuwa kweli.

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Mwisho sisi, na x NA kweli.

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Basi nini x NA kweli?

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x ni kweli na kweli ni kweli pia, hivyo jambo hili lote

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kutathmini kwa kweli.

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>> Next, hebu tuangalie jinsi haya maneno Boolean unaweza

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kweli kutumika katika lugha ya programu.

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Katika C, syntax kwa ajili ya shughuli Boolean ni tofauti kidogo

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kutoka maneno na, au, na si.

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Hebu kufunika syntax.

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Kutumia operator NA, sisi kuandika ampersand mbili.

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Operator AU ni mara mbili bomba line tabia.

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Hii ni sawa wima line, ambayo unaweza pengine

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kupata juu Enter au Kurudi funguo kwenye keyboard yako.

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Na operator NOT tu alama Moderators.

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Hivyo rewrite kujieleza tulikuwa kabla, tunataka tu

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kuandika && this x y | | z!.

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Hiyo kuchukua tu nini hasa sisi alikuwa mbele na kugeuka

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ndani syntax C.

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>> Sasa kwa kuwa tumekuwa kutafsiriwa kujieleza wetu Boolean katika kanuni,

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jinsi gani sisi kweli matumizi yake?

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Hebu sema tuna baadhi ya kificho kwamba lazima tu nitafanya kama

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kujieleza fulani ni kweli.

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Kwa kusudi hili, pretty much lugha ya programu zote

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kusaidia hali ikiwa.

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Hebu sema tuna variable Boolean, x, na tunataka baadhi

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code kutekeleza tu kama x ni kweli.

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Tunataka tu kuandika neno kama, kuweka mabano, na kuweka

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Kujieleza Boolean ndani ya mabano hizo.

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Baada ya kuwa, sisi wrap code tunataka

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nitafanya katika braces curly.

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Nini kama kuna code baadhi Ningependa

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nitafanya kama x si kweli?

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Tu kuandika neno mwingine baada ya wrap kama maelezo,

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code nyingine katika braces curly, na kisha kuwa code mapenzi

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nitafanya kama x si kweli.

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>> Mwingine muhimu Lugha ya kujenga ni mwingine ikiwa.

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Tuseme kuna mbili Booleans ungependa kufikiria,

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hebu kuwaita x na y.

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Tunatangaza vigezo hizi kuwa ni kweli na uongo.

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Kama x na y ni kweli, wewe nitafanya block ya kwanza ya

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code ndani ya braces wale curly.

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Mwingine kama x au y ni kweli, wewe nitafanya block ya pili ya

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kificho, na mwingine wewe nitafanya block mwisho wa code.

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Kufanya kazi na maadili ya Boolean kama hii ni muhimu, lakini

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wewe ni kweli tu mdogo kwa hali ya wachache.

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Booleans inaweza kuwa zaidi ya nguvu wakati wewe kuanzisha

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kulinganisha.

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Hizi ni njia ya kulinganisha maadili ambayo ni

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si awali Boolean.

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Ili kuona kama mbili maadili ni sawa, unaweza kutumia sawa

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usawa, ambayo ni ya kweli kama uko sawa na uongo kama

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wao si.

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Nyingine kulinganisha kawaida ni chini ya mkuu zaidi kuliko, chini ya

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zaidi au sawa na, na zaidi au sawa na.

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>> Kila kitu nimekuwa kufunikwa hadi sasa imekuwa pretty kufikirika, hivyo

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hebu kuanzisha kulinganisha hizi katika moja ya mwisho

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thabiti mfano.

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Tuseme kuna mbili vigezo,

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joto na isHungry.

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Joto ni floating kumweka idadi, hivyo inaweza kuwa na

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decimal maeneo.

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Wewe ni programu maombi rahisi sana ambayo inatuambia

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mtu ni nini kula kulingana na joto.

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Kama wewe ni njaa, NA NA joto ni zaidi au

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sawa na 100, unaweza print kula ice cream.

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Mwingine kama wewe ni njaa NA NA joto ni chini ya

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au sawa na sifuri, unaweza printf ("kula chakula spicy").

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Mwisho, kama wewe si njaa wakati wote, unaweza print "si

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kula kitu chochote. "

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>> Mimi ni Vipul Shekhawat, na hii ni CS50.