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>> SPEAKER 1: Ejja jikteb programm li
iqajjem l-utent għall-ismijiet u

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djar ta 'tliet studenti.

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Issa, li taħżen din l-ismijiet u djar
nistgħu jużaw, liema, sitt varjabbli.

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Tliet kordi għall-ismijiet, u ieħor
tliet kordi għall-djar,

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iżda aħna diġà jafu li nistgħu tnaddaf
dan il-kodiċi bl-użu arrays minflok,

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per eżempju firxa ta 'daqs 3 għall-
tliet ismijiet u firxa oħra ta '

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daqs 3 għall-djar.

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Iżda jirriżulta nistgħu tnaddaf dan up
aktar għadha, u attwalment iżommu dawk

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ismijiet u djar flimkien, b'tali mod li
Isem istudent u d-dar tiegħu jew tagħha

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b'xi mod huma inkapsulati, hekk li
jitkellmu, fl-istess varjabbli.

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>> Biex tagħmel dan, għalkemm, għandna bżonn li jiddikjaraw
stess tip data tagħna, tip tagħna stess fis-C,

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li l-awturi ta 'C ma neċessarjament
think ta 'snin ilu.

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Biex tagħmel dan nistgħu nużaw l-keyword
typedef, flimkien mal-

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Struct ieħor keyword.

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Ejja tagħti ħarsa.

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Ġewwa ta structs.h, stajt diġà
gotten beda billi

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inkluż il-librerija CS50.

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Jien jmiss ser tip Istituzzjonjijiet typedef,
u mbagħad Brace kaboċċi.

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Ġewwa tal-Struct, jien ser
jispeċifikaw li student għandu jkollu

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string imsejħa isem, u ieħor
string imsejħa house.

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Jien ser mbagħad mill-qrib ċineg kaboċċi tiegħi,
u tispeċifika li l-isem ta '

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dan it-tip ta 'dejta ġdid għandu jkun student.

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Fi kliem ieħor, permezz ta 'din sintassi jkollhom I
ddikjarat tip data ġdid ta 'tiegħi stess

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li ma kinux jeżistu mument ilu, u
ġewwa ta 'dan it-tip data huma żewġ data

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oqsma jew membri tad-data, wieħed imsejjaħ isem,
imsejħa house wieħed, tnejn minnhom

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huma ta 'string tip.

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>> Ejja issa jużaw dan it-tip
fi programm attwali.

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Fil structs0.c, stajt gotten simili
myself beda diġà ma 'xi

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kodiċi boilerplate, u jien issa
ser tuża din id-data

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tip student, kif ġej.

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Jien l-ewwel ser jiddikjara
firxa ta 'tip student, I ser

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sejħa l-istudenti array -

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plural -

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u jien ser tispeċifika li d-daqs tagħha ser tkun
tlieta, li, avviż, huwa l-valur tal-

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L-istudenti kostanti -

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fil-kapitali -

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li stajt ddikjarat up here,
aktar kmieni fil-fajl.

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Ejja issa jtenni matul dawk it-tliet
istudenti, u fil-pront l-utent għall-

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ismijiet tagħhom u djar.

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>> għall int i tikseb 0, i huwa inqas
minn dak kostanti, i + +.

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U issa ġewwa tal-ġisem ta 'dan għal
loop, jien ser jistampa xi ħaġa

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bħall-isem istudent.

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Jien imbagħad ser fil-fatt tikseb dak
Isem istudent billi tispeċifika

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istudenti parentesi i.

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Fi kliem ieħor Irrid li l-istudent i-th
fil-firxa imsejħa istudenti, iżda issa

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I rridu nġibu f'dak i-th istudent
isem, u biex tagħmel dan, jien ser jużaw

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l. operatur, sabiex jiksbu fi
ġewwa qasam speċifiku tal-Struct.

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So I jispeċifika istudenti parentesi i. Isem
jiġrilha l-valur tar-ritorn tal GetString ().

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Sadanittant, jien ser jistampa
xi ħaġa simili, qal li student

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house, u issa jien ser tispeċifika
li l-kamp istudenti house i-th

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għandhom jiksbu l-valur tar-ritorn tal-
sejħa oħra għall GetString ().

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>> Issa ejja tagħmel xi ħaġa ma dawn it-tliet
ismijiet u djar istudenti,

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xi ħaġa sempliċi bħal stampar
kull out fil-sentenza.

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għall int i nikseb 0, għal darb'oħra i huwa inqas minn
istudenti, i + +, printf "% s huwa% s.

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n backslash ", u issa let me plagg fil
il-valuri ta 'dawn iż-żewġ oqsma,

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istudenti parentesi i. isem, comma,
istudenti parentesi i. house, qrib

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paren, virgola.

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>> U issa I bżonn tagħmel ħaġ'oħra.

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Fil-qiegħ ta 'dan il-fajl, I bżonn
ħielsa l-memorja li kien allokat

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wara l-kwinti mill GetSring (), li
naturalment jitlob malloc, sabiex

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talloka memorja għall-kordi
it-tipi utent.

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Iżda dan huwa sempliċi.

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għall int i tikseb 0, i huwa inqas minn
istudenti, i + +, u ġewwa l-korp ta '

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dan għal loop, jien sempliċiment se
jipprovdu free istudenti bracket i. isem,

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u l-istudenti ħielsa jibbrakitjaw i. house.

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>> Issa, aħna ħadthom użati b'mod ċar tlieta għal-linji
f'dan il-programm, meta verament I

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setgħet biss użati wieħed, iżda dan huwa
biss għall-finijiet ta 'dimostrazzjoni tal, b'tali mod li

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nistgħu jispeċifikaw fi tliet distinti
passi eżattament dak li aħna qed tagħmel.

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Aħna qed jkollna l-ewwel isem u dar
għal kull wieħed mill-istudenti, aħna mbagħad

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istampar l-isem u l-dar għall-
kull wieħed mit-tliet studenti, u

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allura aħna qed tmur biex ħielsa l-memorja
użati minn kull wieħed mill-istudenti.

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Iżda żgur nistgħu ħadthom jikkombinaw dan
f'waħda akbar għal loop.

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>> Ejja issa jiffranka, tiġbor,
u run dan il-programm.

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jagħmlu structs 0. / structs 0, student
isem, ejja jipprovdu David, hu ser jgħixu

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fil Mather House, l-isem istudent, ejja
jgħidu Lauren, hi ser jgħixu fl Leverett

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House, l-isem istudent, Rob, hu ser
jgħixu fil Kirkland House.

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U fil-fatt, David huwa Mather,
Lauren huwa Leverett,

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u Rob huwa Kirkland.

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