信用卡验证算法在iPhone Sdk [英] Credit Card Validation Algorithm in iPhone Sdk
本文介绍了信用卡验证算法在iPhone Sdk的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
任何人都可以分享信用卡验证算法的示例代码。
Can anyone please share any sample code for Credit Card Validation Algorithm.
推荐答案
Luhn算法:
http://en.wikipedia.org/wiki/Luhn_algorithm
这里有一些常用语言示例:
Here some samples for common languages:
http://rosettacode.org/wiki/Luhn_test_of_credit_card_numbers
从这个链接,大多数CC使用Luhn(见下表):
From this link, most CCs use Luhn (see the table):
http://en.wikipedia.org/wiki/Credit_card_number
从上面的链接(rosettacode):
From the link above (rosettacode):
- (NSMutableArray *) toCharArray {
NSMutableArray *characters = [[NSMutableArray alloc] initWithCapacity:[self length]];
for (int i=0; i < [self length]; i++) {
NSString *ichar = [NSString stringWithFormat:@"%c", [self characterAtIndex:i]];
[characters addObject:ichar];
}
return [characters autorelease];
}
+ (BOOL) luhnCheck:(NSString *)stringToTest {
NSMutableArray *stringAsChars = [stringToTest toCharArray];
BOOL isOdd = YES;
int oddSum = 0;
int evenSum = 0;
for (int i = [stringToTest length] - 1; i >= 0; i--) {
int digit = [(NSString *)[stringAsChars objectAtIndex:i] intValue];
if (isOdd)
oddSum += digit;
else
evenSum += digit/5 + (2*digit) % 10;
isOdd = !isOdd;
}
return ((oddSum + evenSum) % 10 == 0);
}
// results
BOOL test0 = [self luhnCheck:@"49927398716"]; //Result = YES
BOOL test1 = [self luhnCheck:@"49927398717"]; //Result = NO
BOOL test2 = [self luhnCheck:@"1234567812345678"]; //Result = NO
BOOL test3 = [self luhnCheck:@"1234567812345670"]; //Result = YES
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