分数类中的运算符重载

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问题及代码:
/** Copyright (c) 2015, 烟台大学计算机学院* All rights reserved.* 文件名称:Project3.cpp* 作    者:孙金艺* 完成日期:2015年5月20日* 版 本 号:v1.0** 问题描述:(1)实现分数类中的运算符重载,在分数类中可以完成分数的加减乘除(运算后再化简)、                比较(6种关系)的运算。可以在第4周分数类代码的基础上开始工作。* 程序输入:略* 程序输出:略*/#include <iostream>#include <cmath>#include <cstdlib>using namespace std;int gcd(int m,int n);class CFraction{private:    int nume;  // 分子    int deno;  // 分母public:    CFraction(int nu=0,int de=1);   //构造函数,初始化用    void set(int nu=0,int de=1);    //置值,改变值时用    void input();               //按照"nu/de"的格式,如"5/2"的形式输入    void simplify();            //化简(使分子分母没有公因子)    void amplify(int n);        //放大n倍,如2/3放大5倍为10/3    void output(int style=0);   //输出:以8/6为例,style为0时,原样输出8/6;                            //style为1时,输出化简后形式4/3;                            //style为2时,输出1(1/3)形式,表示一又三分之一;                            //style为3时,用小数形式输出,如1.3333;                            //默认方式0    CFraction operator+(const CFraction &c2);    CFraction operator-(const CFraction &c2);    CFraction operator*(const CFraction &c2);    CFraction operator/(const CFraction &c2);    bool operator > (CFraction &c1);    bool operator < (CFraction &c1);    bool operator >= (CFraction &c1);    bool operator <= (CFraction &c1);    bool operator == (CFraction &c1);    bool operator != (CFraction &c1);};CFraction::CFraction(int nu,int de){    if(de!=0)    {        nume=nu;        deno=de;    }    else    {        cout<<"分母不能为0,初始化失败!"<<endl;        exit(0);    }}void CFraction::set(int nu,int de){    if(de!=0)    {        nume=nu;        deno=de;    }    else    {        cout<<"分母不能置为0,更改失败!"<<endl;        exit(0);    }}void CFraction::input(){    char p;    cin>>nume>>p>>deno;    if(p!='/')    {        cout<<"输入不符合格式!"<<endl;        exit(0);    }    else if(deno==0)    {        cout<<"分母不能为0,输入失败!"<<endl;        exit(0);    }}int gcd(int m,int n){    int g;    if(n==0)        g=m;    else        g=gcd(n,m%n);    return g;}void CFraction::simplify(){    int l;    l=gcd(nume,deno);    nume=nume/l;    deno=deno/l;}void CFraction::amplify(int n){    nume=nume*n;}void CFraction::output(int style){    int a;    float b;    if(style==0)        cout<<nume<<'/'<<deno<<endl;    else if(style==1)    {        simplify();        cout<<nume<<'/'<<deno<<endl;    }    else if(style==2)    {       a=nume/deno;       cout<<a<<'('<<nume%deno<<'/'<<deno<<')'<<endl;    }    else if(style==3)    {        b=float(nume)/float(deno);        cout<<b<<endl;    }    else        cout<<"没有此种形式!"<<endl;}CFraction CFraction::operator+(const CFraction &c2){    CFraction c;    c.nume=nume*c2.deno+c2.nume*deno;    c.deno=deno*c2.deno;    c.simplify();    return c;}CFraction CFraction::operator-(const CFraction &c2){    CFraction c;    c.nume=nume*c2.deno-c2.nume*deno;    c.deno=deno*c2.deno;    c.simplify();    return c;}CFraction CFraction::operator*(const CFraction &c2){    CFraction c;    c.nume=nume*c2.nume;    c.deno=deno*c2.deno;    c.simplify();    return c;}CFraction CFraction::operator/(const CFraction &c2){    CFraction c;    c.nume=nume*c2.deno;    c.deno=deno*c2.nume;    c.simplify();    return c;}bool CFraction::operator > (CFraction &c1){    CFraction c;    c=*this-c1;    if(c.nume/deno>0)        return true;    else        return false;}bool CFraction::operator < (CFraction &c1){    CFraction c;    c=*this-c1;    if(c.nume/deno<0)        return true;    else        return false;}bool CFraction::operator >= (CFraction &c1){    return !(*this<c1);}bool CFraction::operator <= (CFraction &c1){    return !(*this>c1);}bool CFraction::operator == (CFraction &c1){    if (*this!=c1)        return false;    else        return true;}bool CFraction::operator != (CFraction &c1){    if (*this>c1||*this<c1)        return true;    else        return false;}int main(){    CFraction cf;    cout<<"默认值输出:";    cf.output();    cout<<"改变值后输出:";    cf.set(6,4);    cf.output(1);    cout<<"输入:";    cf.input();    cout<<"原样输出:";    cf.output(0);    cout<<"放大3倍:";    cf.amplify(3);    cf.output(0);    cout<<"化简形式:";    cf.output(1);    cout<<"真分数形式:";    cf.output(2);    cout<<"小数形式:";    cf.output(3);    CFraction x(4,5),y(-2,6);    CFraction p;    cout<<"分数:";    cout<<"x=";    x.output();    cout<<"     y=";    y.output();    p=x+y;    cout<<"x+y=";    p.output();    p=x-y;    cout<<"x-y=";    p.output();    p=x*y;    cout<<"x*y=";    p.output();    p=x/y;    cout<<"x/y=";    p.output();    if (x>y) cout<<"x大于y"<<endl;    if (x<y) cout<<"x小于y"<<endl;    if (x==y) cout<<"x等于y"<<endl;    if (x>=y) cout<<"x大于等于y"<<endl;    if (x<=y) cout<<"x小于等于y"<<endl;    if (x!=y) cout<<"x不等于y"<<endl;    cout<<endl;    return 0;}

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