求两个分数的加减乘除，并比较大小

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//初始化分子分母-(instancetype)initWithFz:(NSInteger)fz andFm:(NSInteger)fm{    if (self = [super init]) {        _fz = fz;        _fm = fm;    }    return self;}//便利构造器+(instancetype)initWithFz:(NSInteger)fz andFm:(NSInteger)fm{    Fraction * f = [[Fraction alloc]initWithFz:fz andFm:fm];    return f;}//最大公约数-(NSInteger)maxDivisor:(NSInteger)num1 : (NSInteger)num2{    if (num1 * num2 == 0) {        return 0;    }else{        NSInteger max = (num1>num2) ? num1 : num2;        NSInteger min = (num1<num2) ? num1 : num2;        NSInteger rem = 1;        while (rem != 0) {            rem = max % min;            max = min;            min = rem;        }        return max;    }}//约分-(void)reduceFraction{    NSInteger greatCommonDivisor = [self maxDivisor:_fz :_fm];    if (greatCommonDivisor == 0) {        return;    }else{        _fz/=greatCommonDivisor;        _fm/=greatCommonDivisor;    }}//相加-(Fraction *)addFraction:(Fraction *)frac{    Fraction * f = [[Fraction alloc]init];    f.fz = _fz * frac.fm + _fm * frac.fz;    f.fm = _fm * frac.fm;    [f reduceFraction];    return f;}//相减-(Fraction *)subFraction:(Fraction *)frac{    Fraction * f = [[Fraction alloc]init];    f.fz = _fz * frac.fm - _fm * frac.fz;    f.fm = _fm * frac.fm;    [f reduceFraction];    return f;}//相乘-(Fraction *)mulFraction:(Fraction *)frac{    Fraction * f = [[Fraction alloc]init];    f.fz = _fz * frac.fz;    f.fm = _fm * frac.fm;    [f reduceFraction];    return f;}//相除-(Fraction *)divFraction:(Fraction *)frac{    Fraction * f = [[Fraction alloc]init];    f.fz = _fz * frac.fm;    f.fm = _fm * frac.fz;    [f reduceFraction];    return f;}//比较大小-(Fraction *)maxValue:(Fraction *)frac{    Fraction * f = [[Fraction alloc]init];    _fz = _fz * frac.fm;    frac.fz = _fm * frac.fz;        f.fz = ( _fz > frac.fz ? _fz : frac.fz);    f.fm = _fm * frac.fm;        [f reduceFraction];    return f;}//打印分数-(void)printFraction{    if (_fz * _fm >= 0) {        NSLog(@"两分数运算结果为：%ld/%ld",_fz,_fm);    }else{        NSLog(@"两分数运算结果为：-%ld/%ld",labs(_fz),labs(_fm));    }}
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