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>> ROB BOWDEN: Hi, mwen se Rob.

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Apre sa, mwen espere ke w ap chaje
moute pou kredi.

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Se konsa, premye bagay nou bezwen fè
se mande kat kredi a

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nimewo ki soti nan itilizatè a.

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Isit la, nou ap itilize getLongLong.

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Ou te kapab tou itilize getString, men
nan ka sa a, ou ta bezwen yo tcheke

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ki pa te gen okenn ki pa nimerik
karaktè nan fisèl la.

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Se konsa, nou pral sèvi ak getLongLong.

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>> Sonje ke ou pa kapab itilize yon bagay
tankou getInt, depi nimewo a pral

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twò gwo nan anfòm nan yon nonb antye ki pè.

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Yon fwa nou gen ladan nimewo, nou
wè isit la sa a bouk ti tan.

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Se konsa, sa a bouk pandan ke se mete ann aplikasyon
Algorithm Luhn a ke ou

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wè nan espèk a pset.

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>> Apre sa, li la aktyèlman pral
yo dwe yon ti jan entelijan.

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Se konsa, nan espèk a pset, remake ke
Etap youn ak de yo se apa a.

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Nou premye ale sou kat kredi a tout antye
nimewo, kap chèche tout lòt

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N. kòmanse nan dezyèm nan
N. pase a, ak miltipliye yo

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epi ajoute tout chif yo.

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Lè sa a, apre sa, nou ajoute nan
tout lòt chif yo.

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>> Se konsa, olye pou yo ap fè moun ki nan de
etap ki apa a, nou pral konbine

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yo nan yon sèl iterasyon sou la
tout nimewo kat kredi.

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Isit la, nou wè Int egal chif akt
nimewo kat kredi, mod 10.

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Ki sa ki se nimewo kat kredi
Mod 10 ap fè?

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Li ban nou dènye chif la
nan nimewo a tout antye.

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Se konsa, sonje ke si nou divize an
konte moute pa 10, Lè sa a, rès la

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ta dwe tou sa ki sot pase a chif la se.

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23 divize pa 10, nan
rès yo pral 3.

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>> Se konsa, dènye chif a, kounye a isit la, nou wè
nou ap branch sou mult pa 2.

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Se konsa, sa nou pral yo dwe lè l sèvi avèk mult
pa 2 pou se différencier ant

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youn nan "chak nimewo ki lòt soti nan
dezyèm chif "nimewo yo.

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Mult pa 2 ki pral kòmanse soti kòm
fo, depi dènye chif la pa ta dwe

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dwe konsidere kòm ki soti nan
dezyèm nan dènye chif.

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>> Se konsa, Lè sa a, nan fen sa a pou bouk, nou
wè ke nou ap ale nan chanje sa a

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soti nan fo vre.

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Sou iterasyon nan pwochen nan pou bouk la,
li nan ale nan konsidere kòm vrè jouk

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fen a, lè nou chanje
li nan men vre fo.

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Paske lè sa a nou pral nan twazyèm mwa a
chif pase a, ki se pa youn nan

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chif ke nou ta dwe anpil anpil pitit pa 2.

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>> Se konsa, si nou rive yo dwe sou youn nan moun ki
chif ke nou vle miltipliye li pa 2,

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nou wè n ap ajoute nan kontwòl nou an.

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Ak isit la, nou lè l sèvi avèk la
tèrsyèr operatè yon fwa

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ankò yon ti jan entelijan.

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Se konsa, si akt chif se mwens pase 5, Lè sa a,
nou ka jis fè akt fwa chif 2.

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Sa a ki senp.

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Si li nan 1, lè sa a nou vle ajoute 2.

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Si li nan 2, nou vle ajoute 4.

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Si li nan 4, nou vle ajoute 8.

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>> Se konsa, sa ki nan espesyal sou 5?

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Oke, 5 fwa 2 a se 10.

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Epi sonje soti nan espèk a pset ki
nou vle ajoute chif yo nan la

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fwa nimewo 2, epi yo pa la
fwa nimewo 2 tèt li.

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Se konsa, si nimewo orijinal la
se 7, 7 fwa 2 a se 14.

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Nou vle ajoute 1 plis 4
nan nimewo a, pa 14.

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>> Se konsa, isit la, si kantite a se 5 oswa pi plis,
sa n ap fè se akt chif

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fwa 2 mwens 9.

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Men, si ou panse osijè de sa,
5 fwa 2 a se 10.

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Se konsa, nou ap ajoute 1,
ki se 10 mwens 9.

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Apre sa, 6 fwa 2 se 12.

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Se konsa, nou ap ajoute 3, ki
se 12 mwens 9.

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Apre sa, ki travay pou tout chif yo.

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>> Se konsa, sa a, se sa n ap ajoute
kontwòl nou an.

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Apre sa, lòt moun sa a se sa ki manyen Etap
De nan algorithm Luhn a, ki se jis

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ajoute chif la si li pa rive
yo dwe youn nan tout lòt chif yo.

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Se konsa, yon fwa nou gen sa a, sa a se kenbe
tras nan de premye karaktè yo nan

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nimewo a kat kredi, de nan premye
chif, depi nou ap evantyèlman pral

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vle sèvi ak bagay sa a isit la yo verifye,
tout dwa, yon viza te kòmanse

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ak sa a, ak yon bezwen American Express
kòmanse ak sa a, ak sou sa.

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>> Finalman, nou fè kat kredi
nimewo egal kat kredi

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nimewo divize pa 10.

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Poukisa nou fè sa?

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Oke, nou jis okipe dènye chif la.

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Divize pa 10 ap chanjman
nimewo a tout antye sou.

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Se konsa, koulye lè nou bouk tounen, nou ap
yo pral manyen la

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dezyèm nan dènye chif.

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Lè sa a, lè nou frape sa a ankò, nou pral
yo koupe dezyèm lan nan dènye

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chif, bouk tounen, ak okipe twazyèm lan
nan dènye chif, ak sou sa, jouk la

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nimewo rive nan 0, nan pwen sa a
nou kraze soti nan bouk la pandan y ap.

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>> Nou ap tou kenbe tras nan kredi a
nimewo kat longè, depi lè sa a

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enpòtan yo fè distenksyon ant si li nan
yon nimewo kat kredi ki valid.

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Se konsa, koulye a, yon fwa nou te kalkile nan
kontwòl, nou ka detèmine si li

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se yon kat ki valid.

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Mod a Kontwòl 10 se yon pati
nan algorithm Luhn la.

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Si kontwòl mod 10 retounen yon bagay
ki pa zewo, Lè sa a, sa a ap retounen vre,

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nan ka sa a, ki kantite
dwe valab.

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>> Sinon, si Kontwòl mod 10
se 0, Lè sa a, nou ka kontinye.

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Sa a gwo lòt moun si se li di, si premye a
de chif ki egal a AMEX 1,

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kote moute isit la, nou wè ke AMEX
1, tankou pou chak espèk a, se 34.

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Epitou, n ap tou konpare li
AMEX 2, ki se 37.

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Apre sa, longè a nimewo kat kredi a se
egal a espere American Express la

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kat longè, Lè sa a, nou kapab
ekri ak lèt ​​detache American Express.

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>> Nou pral fè yon gwo bagay ki sanblab ak Visa.

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De premye chif yo bezwen yo dwe pi gwo
pase oswa egal a 40, oswa mwens

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pase oswa egal a 49.

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Moun sa yo ki reprezante kat Visa ki valid.

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Apre sa, longè a bezwen yo dwe egal a
Longè Visa 1 oswa Visa Longè 2.

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Se konsa, longè a yo dwe swa
13 oswa 16 chif long.

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>> Epi finalman ak MasterCard, li nan
menm jan ak Visa, ke de nan premye

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chif bezwen yo dwe nan yon sèten
ranje, ak longè dwe nan

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dwe egzakteman 16 chif.

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Se konsa, si nenpòt nan ka sa yo kenbe, Lè sa a, nan
pwemye ka a, nou pral ekri ak lèt ​​detache AMEX.

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Si ka sa a kenbe, nou pral ekri ak lèt ​​detache Visa.

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Si ka sa a kenbe, nou pral
ekri ak lèt ​​detache MasterCard.

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>> Men, si yonn nan moun ki kenbe, menm
si Kontwòl a te valab,

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nou toujou ekri ak lèt ​​detache valab.

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Paske li pa youn nan
sa yo kalite kat.

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Non mwen se Rob, e mwen espere ou
yo te jwenn kredi ki enteresan.

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