Greatest Common Divisor(GCD) and Least Common Multiple(LCM)

Fraction.m

@interface Fraction : NSObject

+(int) gcd: (int) num1:(int) num2;
+(int) lcm: (int) num1:(int) num2;

@end

@implementation Fraction

+(int) gcd:(int)num1:(int)num2
{
    if (num2 == 0) {
        return num1;
    }
    return [Fraction gcd:num2:num1 % num2];
}

+(int) lcm:(int)num1:(int)num2
{
    return abs((num1 * num2) / [Fraction gcd:num1:num2]);

}
@end