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>> [Music kucheza]

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>> DOUG LLOYD: zote haki, hivyo hebu
majadiliano juu ya amri ya mstari wa hoja.

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Kwa hiyo, hadi sasa katika mwendo mzuri
mengi yote ya programu yako

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pengine kuanza
kama hii int kuu utupu.

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Tumekuwa kukusanya
user pembejeo kama sisi haja yake

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katika mipango yetu, kama vile
Mario mpango, kwa mfano,

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na katika-mpango papo kwa hapo.

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Sisi si zinahitajika ili kurekebisha
tamko la kuu,

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kwa sababu badala ndani ya kuu sisi
tu kusema, unaweza kuiita kupata int.

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Jinsi kubwa Unataka piramidi kuwa?

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Au unaweza kuiita kupata
kuelea mabadiliko ni kiasi gani

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lazima mimi pato kwa mtumiaji?

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>> Kuna njia nyingine ni kwamba,
na kama tunataka watumiaji wetu

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kuwa na uwezo wa kutoa
data kwa mpango wetu

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katika Runtime badala ya wakati
mpango ni mbio,

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Tofauti hila lakini
wakati mwingine moja muhimu sana,

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tunahitaji aina mpya ya kutangaza kuu.

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Hatuwezi kutumia int kuu utupu kama tunataka
kukusanya takwimu nyingine katika amri ya mstari

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wakati mtumiaji anaendesha mpango,
hivyo amri ya mstari wa hoja.

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>> Kukusanya hizi amri ya mstari
hoja kutoka kwa mtumiaji,

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mabadiliko tamko yako ya
kuu ya kuangalia kama hii int

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kuu, Paren wazi, int argc, comma,
kamba argv, mabano mraba,

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na kisha kufungua curly brace.

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Hivyo hiyo ina maana gani tayari?

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Naam, sisi ni kupita katika vigezo mbili,
au hoja, au pembejeo kwa kuu.

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Moja, integer kuitwa
argc, na wengine ni nini?

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Ni safu ya masharti, sawa?

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Tunaona kwamba mraba bracket nukuu.

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Ni safu ya masharti.

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Siyo kamba ya mtu binafsi,
ni safu ya masharti.

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Na hawa hoja mbili, argc na argv,
kuwawezesha wewe kujua nini data user

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imetoa katika amri ya mstari
na ni mambo mangapi

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zinazotolewa katika amri ya mstari.

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Mambo pretty muhimu kufanya kazi pamoja.

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>> Argc anasimama kwa hoja kuhesabu,
na unapaswa kujua, kwa njia,

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kwamba unaweza kuwaita argc
chochote unataka.

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Unaweza kupiga argv chochote alitaka.

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Haya ndiyo majina tu ya kawaida
kwamba sisi kutumia kwa them-- hoja kuhesabu,

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na kama tutaweza kuona katika pili,
Hoja vector, argv.

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Lakini huna kuwaita
argc na argv kama wewe hawataki,

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lakini conventionally, hiyo ni nini cha kufanya.

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>> Hivyo anyway, argc, hoja kuhesabu.

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Ni integer aina kutofautiana na hivyo, kama
unaweza kutarajia, kama tuna mambo mawili

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kwamba tunakwenda kuwa kutafuta
nini hawa yameingizwa

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na mambo ni kiasi gani
mtumiaji typed, argc ni

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kwenda kutuambia ni kiasi gani
stuff mtumiaji typed.

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Hivyo ni anatoa idadi ya
amri ya mstari wa hoja mtumiaji

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typed wakati mpango aliuawa.

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Hivyo kama mpango wako ni
kukimbia nukta kufyeka tamaa,

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na ndani ya tamaa yako
mpango kazi yako kuu

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ina tamko int kuu int argc,
kamba argv mabano mraba, kisha

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argc katika kesi hiyo ni moja.

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Sasa angalia hatufanyi
kuhesabu mambo mangapi

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mtumiaji typed baada jina mpango.

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Jina programu yenyewe makosa
kama hoja amri ya mstari.

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>> Hivyo dot kufyeka tamaa, katika
kesi hiyo, argc ni moja.

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Kama mtumiaji typed kufyeka tamaa 1024 CS50
katika amri ya mstari, argc katika kesi hiyo

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itakuwa tatu.

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Na tunajua hii kwa sababu njia
kwamba mgawanyiko kati ya masharti

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ni wanaona ni kama
kuna nafasi, au tab,

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au kitu kama hicho kati yao.

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Hivyo kiasi chochote cha nafasi nyeupe, kinachojulikana,
kati ya maadili typed amri ya mstari

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inaonyesha jinsi wengi kuna.

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Hivyo dot kufyeka nafasi tamaa 1024 nafasi
CS50, argc, katika kesi hiyo, ni tatu.

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>> Argv ni hoja vector.

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Vector, kwa njia, ni tu
neno lingine kwa safu,

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na hii ni safu
kwamba maduka masharti.

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Kamba moja kwa kipengele, ambayo ni
masharti kwamba mtumiaji kweli

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typed katika amri ya mstari
wakati mpango aliuawa.

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Sasa, kama ilivyo
na safu yoyote, kama wewe

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kukumbuka kutoka mjadala wetu wa
arrays, kitu cha kwanza cha argv

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ni daima kwenda kwa kupatikana
katika argv mraba mabano sifuri.

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Hiyo ni ripoti ya kwanza
ya argv safu.

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Ili will-- na kwa kweli, kwamba mapenzi
kuwa daima jina la mpango,

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daima kuwa ipo katika
argv mraba mabano sifuri.

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>> Kipengele mwisho wa argv ni daima kupatikana
katika argv mraba mabano argc bala moja.

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Je, unaweza kuona nini?

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Kumbuka mambo mangapi
zipo katika safu hii.

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Naam, tunajua that-- ni
argc idadi ya vipengele.

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Kama mtumiaji typed mambo matatu katika
amri ya mstari, argc ni tatu.

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Lakini kwa sababu katika c, wakati sisi ni kufanya kazi
na arrays, kila kipengele cha safu,

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au tuseme fahirisi ya
safu, kuanza saa sifuri.

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Kama tuna mambo matatu katika yetu
safu, tuna kipengele katika argv sifuri,

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kipengele katika argv moja,
na kipengele katika argv mbili.

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Hakuna kipengele katika argv
tatu, na safu ya ukubwa tatu.

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Hivyo ndiyo sababu mwisho
kipengele cha argv unaweza daima

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kupatikana katika argv mraba
mabano argc bala moja.

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>> Basi hebu kudhani executes mtumiaji
Mpango wenye tamaa kama follows--

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kama aina katika amri ya mstari wa nukta
kufyeka tamaa nafasi 1,024 nafasi CS50,

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na kwa sababu yoyote tumekuwa
tayari tayari mpango wetu wenye tamaa

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kujua na kufanya kazi na hawa
amri ya mstari wa hoja.

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Hatukuwa awali wakati sisi kazi
juu yake kwa tatizo tamaa,

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lakini hebu sema tumekuwa sasa iliyopita
hivyo kwamba sisi kufanya mchakato

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amri ya mstari wa hoja kwa namna fulani.

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Katika kesi hiyo, argv sifuri
ni dot slash tamaa.

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Nini argv moja?

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Naam, ni 1024, sawa?

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Ni 1024, lakini hapa ni
distinction-- kweli ni muhimu

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Unakumbuka aina data ya argv?

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>> Ni maduka masharti, right?

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Lakini inaonekana kama 1024
ni thamani integer.

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Hii ni kweli ni muhimu
Tofauti na ni kweli

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inaenda kuwa kitu ambacho
anaweza kukutana katika matatizo baadaye.

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Kila kitu katika argv ni
kuhifadhiwa kama kamba.

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Hivyo yaliyomo argv mtu ni
kamba moja, sifuri, mbili, nne,

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yenye wahusika hao wanne.

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Ni kama mtumiaji typed
moja, sifuri, mbili, nne

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kama barua binafsi au wahusika.

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Sio integer 1024,
na hivyo huwezi moja kwa moja

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kazi na hivyo kwa kusema int 1,000, au
badala int x sawa argv moja bala 24.

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>> Shirikishi, unaweza kufikiri ya kwamba
kama, sawa, vizuri ni 1,024 bala 24,

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hivyo x ni sawa na 1,000.

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Lakini kwa kweli, si kwamba kesi,
kwa sababu argv moja ni kamba.

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Kamba 1024.

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Sasa kuna kazi ambayo inaweza kuwa
kutumika kubadili masharti ya integers.

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Mimi si nyara hiyo kwa ajili yenu
sasa, lakini mimi nina uhakika Zamyla

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kuwa na furaha kukuambia kuhusu hilo katika
walkthrough kwa tatizo baadaye.

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Lakini pia unaweza kupata
matatizo like-- kisingizio

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mimi, kazi ambayo ingekuwa
kufanya hivyo katika kumbukumbu 50,

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ukienda rejea mwongozo
unaweza kupata kazi ambayo

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itafanya kubadilika hii kwa ajili yenu.

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Lakini tena, katika walkthrough
kwa tatizo baadaye,

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Zamyla watafurahi
kukuambia nini kazi

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ni kwamba mapenzi kubadilisha
kamba 1024 kwa integer 1024.

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>> Haki wote, hivyo kuendelea.

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Tumekuwa kufunikwa argv yetu sifuri,
tumekuwa kufunikwa argv moja.

129
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Nini katika argv mbili?

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CS50.

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Moja kwamba pengine
pretty maelezo binafsi.

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Nini katika argv tatu?

133
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Naam tena, sisi si kweli kujua, sawa?

134
00:07:04,970 --> 00:07:08,060
Tuna safu ya ukubwa tatu,
hiyo ni mambo mangapi mtumiaji

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typed katika amri ya mstari,
hivyo kama sisi kwenda argv tatu,

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00:07:11,610 --> 00:07:14,660
sisi ni sasa overstepping
mipaka ya safu yetu.

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00:07:14,660 --> 00:07:18,570
Compiler hebu kufanya hivyo,
hakuna tatizo Intuitive na hayo,

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lakini katika suala la kweli nini kinaendelea
kutokea, sisi si kweli kujua.

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Ni unategemea nini ni
ziko katika kumbukumbu ambapo

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argv tatu itakuwa inatarajiwa kuwa.

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Na hivyo tunaweza kuishia
kupata mbali Scot bure.

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Zaidi kuliko hata, hasa wakati
wewe ni kufanya kazi na argv kinyume

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kwa safu nyingine yoyote
hiyo ni katika mpango wetu,

144
00:07:35,548 --> 00:07:38,660
sisi ni pengine anaenda kuteseka
segmentation kosa. Hivyo tena,

145
00:07:38,660 --> 00:07:42,756
kuwa na uhakika sio overstep mipaka
ya arrays yako, hasa argv,

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kutokana na shahada yake ya juu ya
umuhimu katika mipango yako.

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00:07:47,170 --> 00:07:48,100
>> Mimi nina Doug Lloyd.

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00:07:48,100 --> 00:07:50,170
Hii ni CS50.

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00:07:50,170 --> 00:07:51,457