通过Luhn算法验证信用卡卡号是否有效代码,ObjC代码库,德仔网

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【ObjC】通过Luhn算法验证信用卡卡号是否有效

作者:清源 / 发布于2014/11/4/ 787


	- (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);
	}
	
	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"];

试试其它关键字

　信用卡卡号　　 Luhn　

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