OC2_分数类

//
//  Fraction.h
//  OC2_分数类
//
//  Created by zhangxueming on 15/6/10.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface Fraction : NSObject
{
    NSInteger _numerator;
    NSInteger _denominator;
}

- (id)initWithNumerator:(NSInteger)aNumerator andDenominator:(NSInteger)aDenominator;

- (NSInteger)numerator;
- (NSInteger)denominator;

- (void)setNumerator:(NSInteger)aNumerator;
- (void)setDenominator:(NSInteger)aDenominator;
- (void)setNumerator:(NSInteger)aNumerator andDenominator:(NSInteger)aDenominator;

- (void)addFraction:(Fraction *)aFraction;
- (void)subFraction:(Fraction *)aFraction;
- (void)mulFraction:(Fraction *)aFraction;
- (void)divFraction:(Fraction *)aFraction;

- (void)reduceFraction;

- (void)printFraction;

+ (void)testFraction;

@end

//
//  Fraction.m
//  OC2_分数类
//
//  Created by zhangxueming on 15/6/10.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

#import "Fraction.h"

@implementation Fraction

- (id)initWithNumerator:(NSInteger)aNumerator andDenominator:(NSInteger)aDenominator
{
    if (self = [super init]) {
        _numerator = aNumerator;
        _denominator = aDenominator;
    }
    return self;
}

- (NSInteger)numerator
{
    return self->_numerator;
}
- (NSInteger)denominator
{
    return self->_denominator;
}

- (void)setNumerator:(NSInteger)aNumerator
{
    self->_numerator = aNumerator;
}
- (void)setDenominator:(NSInteger)aDenominator
{
    self->_denominator = aDenominator;
}

- (void)setNumerator:(NSInteger)aNumerator andDenominator:(NSInteger)aDenominator
{
    self->_numerator = aNumerator;
    self->_denominator = aDenominator;
}

- (void)addFraction:(Fraction *)aFraction
{
    self->_numerator = [self numerator] * [aFraction denominator] + [self denominator] * [aFraction numerator];
    self->_denominator = [self denominator] * [aFraction denominator];
}
- (void)subFraction:(Fraction *)aFraction
{
    self->_numerator = [self numerator] * [aFraction denominator] - [self denominator] * [aFraction numerator];
    self->_denominator = [self denominator] * [aFraction denominator];
}

- (void)mulFraction:(Fraction *)aFraction
{
    _numerator = [self numerator] * [aFraction numerator];
    _denominator = [self denominator] * [aFraction denominator];
}

- (void)divFraction:(Fraction *)aFraction
{
    _numerator = [self numerator] * [aFraction denominator];
    _denominator = [self denominator] * [aFraction numerator];
}

- (void)reduceFraction
{
    NSInteger n = _numerator;
    NSInteger d = _denominator;
    while (d) {
        NSInteger temp = n%d;
        n = d;
        d = temp;
    }
    _numerator /= n;
    _denominator /= n;
}

- (void)printFraction
{
    NSLog(@"%ld/%ld", [self numerator], [self denominator]);
}

+ (void)testFraction
{
    Fraction *f1 = [[Fraction alloc] initWithNumerator:1 andDenominator:4];
    Fraction *f2 = [[Fraction alloc] init];
    [f2 setNumerator:1 andDenominator:4];
    [f1 addFraction:f2];
    [f1 reduceFraction];
    [f1 printFraction];
}
@end

//
//  main.m
//  OC2_分数类
//
//  Created by zhangxueming on 15/6/10.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

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

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        [Fraction testFraction];
    }
    return 0;
}