Example of Objective-C Class

MFUtilities.h

#import <Foundation/Foundation.h>
#import "MFFraction.h"

@interface MFUtilities : NSObject
{
  int count;
}
//main intro
-(double)getValueOfFraction:(MFFraction *)fraction;
-(BOOL)isEqual:(MFFraction *)fractionOne and:(MFFraction *)object;
-(NSComparisonResult)compare:(MFFraction *)fractionOne and:(MFFraction *)otherObject;



@end

MFUtilities.m

//  MFUtilities.m
/*
 Author: Janusz Chudzynski
*/
#import "MFUtilities.h"

//MFUtilities Extension
@interface MFUtilities()
//private methods and objects

@end

@implementation MFUtilities


-(double)getValueOfFraction:(MFFraction *)fraction;{
     return fraction.numerator.intValue*1.0/fraction.denominator.intValue*1.0;

}

- (NSComparisonResult)compare:(MFFraction *)fractionOne and:(MFFraction *)otherObject {
    float a =  fractionOne.numerator.intValue/fractionOne.denominator.intValue;
    float b = otherObject.numerator.intValue/otherObject.denominator.intValue;
    if(a==b)
    {
        return NSOrderedSame;
    }
    if(a<b){
        return NSOrderedAscending;
    }
    return NSOrderedDescending;
}

- (BOOL)isEqual:(MFFraction *)fractionOne and:(MFFraction *)object
{
   MFFraction * other = (MFFraction *)object;
    fractionOne = [self simplify:fractionOne];
    other = [self simplify:other];
    
  return fractionOne.numerator.intValue == other.numerator.intValue && fractionOne.denominator.intValue == other.denominator.intValue;
  
}

-(MFFraction *)simplify:(MFFraction *)_fraction{
  
    int a = _fraction.numerator.intValue;
    int b = _fraction.denominator.intValue;
    
    long gcm = GCD(a, b);
    a = a/gcm;
    b= b/gcm;
    _fraction.numerator = [NSNumber numberWithInt:a];
    _fraction.denominator = [NSNumber numberWithInt:b];
    
    return _fraction;
}

int GCD(int a, int b){
    if (b==0) return a;
    return GCD(b,a%b);
}

@end