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Editor to share with you based on the Luhn algorithm format to verify whether the bank card number entered by the user is correct, I hope you will gain something after reading this article, let's discuss it together!

IOS Code:

/ * * @ param cardNo bank card number * * @ return * / + (BOOL) checkCardNo: (NSString*) cardNo {int oddsum = 0; / / odd summation int evensum = 0; / / even summation int allsum = 0; int cardNoLength = (int) [cardNo length]; int lastNum = [[cardNo substringFromIndex:cardNoLength-1] intValue]; cardNo = [cardNo substringToIndex:cardNoLength-1] For (int I = cardNoLength-1)) {NSString * tmpString = [cardNo substringWithRange:NSMakeRange (imuri 1,1)]; int tmpVal = [tmpString intValue]; if (cardNoLength% 2 = = 1) {if ((I% 2) = = 0) {tmpVal * = 2; if (tmpVal > = 10) tmpVal-= 9; evensum + = tmpVal;} else {oddsum + = tmpVal }} else {if ((I% 2) = = 1) {tmpVal * = 2; if (tmpVal > = 10) tmpVal-= 9; evensum + = tmpVal;} else {oddsum + = tmpVal;}} allsum = oddsum + evensum; allsum + = lastNum; if ((allsum% 10) = = 0) return YES; else return NO;}

Androd Code:

/ * matching Luhn algorithm: it can be used to detect the bank card number * @ param cardNo * @ return * / public static boolean matchLuhn (String cardNo) {int [] cardNoArr = new int [cardNo.length ()]; for (int isidentin I = 0transferiMusure 2) {cardNoArr [I]

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