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Initial commit. Need to update README
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MaxKramer committed Dec 30, 2012
1 parent e6dc3b2 commit d7da3e6
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15 changes: 15 additions & 0 deletions Algorithm Class/Luhn.h
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//
// Luhn.h
// Luhn Algorithm (Mod 10)
//
// Created by Max Kramer on 30/12/2012.
// Copyright (c) 2012 Max Kramer. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface Luhn : NSObject

+ (BOOL) validateString:(NSString *) ccString;

@end
45 changes: 45 additions & 0 deletions Algorithm Class/Luhn.m
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//
// Luhn.m
// Luhn Algorithm (Mod 10)
//
// Created by Max Kramer on 30/12/2012.
// Copyright (c) 2012 Max Kramer. All rights reserved.
//

#import "Luhn.h"

@implementation Luhn

+ (BOOL) validateString:(NSString *) _string {

NSMutableString *reversedString = [NSMutableString stringWithCapacity:[_string length]];

[_string enumerateSubstringsInRange:NSMakeRange(0, [_string length]) options:(NSStringEnumerationReverse |NSStringEnumerationByComposedCharacterSequences) usingBlock:^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop) {
[reversedString appendString:substring];
}];

unsigned int odd_sum = 0, even_sum = 0;

for (int i = 0; i < [reversedString length]; i++) {

NSInteger digit = [[NSString stringWithFormat:@"%C", [reversedString characterAtIndex:i]] integerValue];

if (i % 2 == 0) {

odd_sum += digit;

}

else {

even_sum += digit / 5 + ( 2 * digit) % 10;

}

}

return (odd_sum + even_sum) % 10 == 0;

}

@end
314 changes: 314 additions & 0 deletions Example Project/Luhn Algorithm (Mod 10).xcodeproj/project.pbxproj
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19 changes: 19 additions & 0 deletions Example Project/Luhn Algorithm (Mod 10)/AppDelegate.h
View file
@@ -0,0 +1,19 @@
//
// AppDelegate.h
// Luhn Algorithm (Mod 10)
//
// Created by Max Kramer on 30/12/2012.
// Copyright (c) 2012 Max Kramer. All rights reserved.
//

#import <UIKit/UIKit.h>

@class ViewController;

@interface AppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;

@property (strong, nonatomic) ViewController *viewController;

@end

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