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>> [Daqq tal-mużika]

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>> ROB BOWDEN: Huwa me, Rob.

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Ejja jimxu permezz ta 'kif
biex jimplimentaw Mario.

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Allura l-ewwel ħaġa li għandna bżonn tagħmel hu li
pront l-utent għall-input.

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>> Għandna bżonn li jistaqsu lilhom eżattament kif
tall-piramida għandu jkun.

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Allura hawn, naraw li aħna qed tagħmel
għoli = GetInt.

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An U ftakar li l-funzjoni GetInt
hija implimentata fil-CS50

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librerija, hekk top up, għandna bżonn li
ftakar li # jinkludi cs50.h.

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>> Allura għaliex għandna dan mgeżwra
fil-linja do-waqt?

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Well, aħna wkoll bżonn li wieħed jiftakar li
input l-utent għandu jkun validu.

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X'inhu input invalidu?

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Ukoll l-spec pset speċifikament jgħid
li f'għoli inqas minn 0 jew akbar

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minn 23 huwa invalidu.

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>> Allura up here, naraw li aħna qed tiddefinixxi
kostanti imsejjaħ MAX_HEIGHT mal-

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valur ta '23.

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Dan loop do-waqt li se jkompli filwaqt li
għoli huwa inqas minn 0 jew MAX_HEIGHT huwa

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inqas mit-tul, li jfisser li
23 huwa inqas mill-għoli.

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Mela jekk l-għoli huwa 24 jew aktar, aħna qed
se tkompli looping.

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Ftakar li do-waqt loops huma pjuttost
utli meta irridu jiksbu

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input utent u mbagħad jivvalida dan, peress
aħna inevitabbilment bżonn biex issaqsi lill-utent fuq

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inqas darba għall-valur li jridu.

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>> Allura ladarba għandna l-kontribut tagħhom, aħna
issa tista 'tibni l-piramida.

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Wieħed mill-tricks ta 'din il-problema stabbiliti hija
li għandna biex tibda fil-quċċata ta '

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il-piramida.

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Inti ma tistax printf-qiegħ tal-
piramida u mbagħad jibnu tiegħek mod up.

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Mela ejja nħarsu lejn l-eżempju
mill-spec pset.

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>> Naraw hawnhekk li meta aħna jidħol għoli
tat-8, il-qiegħ nett tal-

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piramida stampi disa hashes.

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Wieħed livell up minn dak prints
spazju wieħed u tmien hashes.

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Wieħed livell up minn dan huwa żewġ spazji u
seba hashes, it-triq kollha sakemm aħna

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jiksbu l-quċċata tal-piramida, li hija
tmien livelli up, li jippubblikaw seba '

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spazji u żewġ hashes.

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Mela ftakar li għandna
tagħmel l-ewwel dan il-livell ogħla.

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>> Hawnhekk aħna qed mtennija mill-
ogħla livell, ringiela 8, kontinwu

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sakemm ringiela jilħaq 0.

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Allura kif ħafna spazji ma neħtieġu
li jistampaw f'dak ringiela ta 'fuq?

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Aħna stampati seba spazji
u żewġ hashes.

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Allura l-għadd ta 'spazji li rridu huwa
il-filliera li kienu fuq minus 1.

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>> Jekk il-filliera ta 'fuq huwa 8, 8 minus
1 tagħtina seba spazji.

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Imbagħad għandna loop li se print
out kull spazju wieħed fi żmien.

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Allura meta spazji hija ta '7, dan loop
seba 'darbiet, l-istampar

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seba 'spazji individwali.

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>> Allura issa għandna bżonn li tistampa dawn hashes
fl-aħħar tal-piramida.

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Allura hawnhekk, għandna bżonn li jikkalkulaw
in-numru ta 'hashes.

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Naraw li aħna qed tagħmel l-għoli
ringiela minus plus 2.

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Allura kif ma nikbru li?

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>> Ftakar li l-quċċata tal-piramida
huwa ringiela 8, u l-għoli huwa ta '8.

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U aħna xorta stampat żewġ hashes.

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Allura għall-inqas, 8 minus 8 plus
2 jagħtina t-tweġiba ġusta.

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U mbagħad jikkunsidraw il-qiegħ
tal-piramida, ringiela 1.

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Ringiela minus għoli se tagħtina 7, u
imbagħad plus 2 jagħtina disa hashes,

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li huwa eżattament l-għadd
ta hashes li aħna stampati.

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Allura dan huwa l-formula li rridu
jużaw biex jikkalkulaw in-numru

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hashes f'kull filliera.

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>> Bl-użu dak in-numru, aħna mbagħad ikollhom ieħor
għall-loop, simili ħafna għall-

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għal linja li aħna użati għall-ispazji,
li ttenni numru ta 'drabi hashes

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istampar ta 'hash wieħed kull darba.

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Fuq il-filliera ta 'fuq, li ser
jistampaw żewġ hashes.

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Fuq il-filliera qiegħ, li ser
print disa hashes.

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U kull ringiela oħra se print kull
numru ta 'hashes bejniethom.

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>> U mbagħad fl-aħħar nett, għandna bżonn li
print linja l-ġdida tagħna biex tmur fil-li jmiss

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ringiela fil-piramida.

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Fl-aħħarnett, għandna bżonn li jistampaw il-linja ġdida
fit-tmiem tal-filliera biex

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ikomplu għall-ieħor
ringiela tal-piramida.

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U fl-aħħar tal-programm tagħna,
aħna għandna l-ritorn 0.

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>> Skond l-spec pset, ir-ritorn
0 mhijiex strettament neċessarja.

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Iżda li dan ifisser li l ewlenija isir.

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Jisimni Rob, u dan kien Mario.

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>> [Daqq tal-mużika]

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