第九周项目三 分数类中的运算符重载（续）

/**Copyright (c)2014,烟台大学计算机与控制工程学院*All rights reserved.*文件名称：test.cpp*作    者：徐洪祥*完成日期：2015年5月20日*版 本 号：v1.0** 问题描述：实现分数类中的对象和整型数的四则运算，且运算符合交换律,定义分数的一目运算+和 -，分别            代表分数取正和求反，将“按位取反运算符”~重载为分数的求倒数运算；定义分数类中<<和>>运算符重载，            实现分数的输入输出，改造原程序中对运算结果显示方式，使程序读起来更自然。* 输入描述：* 程序输出：*/#include <iostream>#include <cmath>using namespace std;class CFraction{private:    int nume;    int deno;public:    CFraction(int nu=0,int de=1):nume(nu),deno(de) {}    void simplify();    friend istream &operator>>(istream &in,CFraction &x);    friend ostream &operator<<(ostream &out,CFraction x);    CFraction operator+(const CFraction &c);    CFraction operator-(const CFraction &c);    CFraction operator*(const CFraction &c);    CFraction operator/(const CFraction &c);    CFraction operator+();    CFraction operator-();    CFraction operator~();    bool operator >(const CFraction &c);    bool operator <(const CFraction &c);    bool operator==(const CFraction &c);    bool operator>=(const CFraction &c);    bool operator<=(const CFraction &c);    bool operator!=(const CFraction &c);};void CFraction::simplify(){    int m,n,r;    m=fabs(deno);    n=fabs(nume);    while(r=m%n)    {        m=n;        n=r;    }    deno/=n;    nume/=n;    if(deno<0)    {        deno=-deno;        nume=-nume;    }}istream &operator>>(istream &in,CFraction &x){    char ch;    while(1)    {        cin>>x.nume>>ch>>x.deno;        if (x.deno==0)            cout<<"分母不能为0, 请重新输入\n";        else if(ch!='/')            cout<<"格式错误! 请重新输入\n";        else            break;    }    return cin;}ostream &operator<<(ostream &out,CFraction x){    cout<<x.nume<<'/'<<x.deno;    return cout;}CFraction CFraction::operator+(const CFraction &c){    CFraction t;    t.nume=nume*c.deno+deno*c.nume;    t.deno=deno*c.deno;    t.simplify();    return t;}CFraction CFraction::operator-(const CFraction &c){    CFraction t;    t.nume=nume*c.deno-deno*c.nume;    t.deno=deno*c.deno;    t.simplify();    return t;}CFraction CFraction::operator*(const CFraction &c){    CFraction t;    t.nume=nume*c.nume;    t.deno=deno*c.deno;    t.simplify();    return t;}CFraction CFraction::operator/(const CFraction &c){    CFraction t;    t.nume=nume*c.deno;    t.deno=deno*c.nume;    t.simplify();    return t;}CFraction CFraction:: operator+(){    return *this;}CFraction CFraction:: operator-(){    CFraction x;    x.nume=-nume;    x.deno=deno;    return x;}CFraction CFraction:: operator~(){    CFraction x;    x.nume=deno;    x.deno=nume;    if(x.deno<0)    {        x.deno=-x.deno;        x.nume=-x.nume;    }    return x;}bool CFraction::operator>(const CFraction &c){    int this_nume,c_nume,common_deno;    this_nume=nume*c.deno;    c_nume=deno*c.nume;    common_deno=deno*c.deno;    if((this_nume-c_nume)*common_deno>0)        return true;    else        return false;}bool CFraction::operator<(const CFraction &c){    int this_nume,c_nume,common_deno;    this_nume=nume*c.deno;    c_nume=deno*c.nume;    common_deno=deno*c.deno;    if((this_nume-c_nume)*common_deno<0)        return true;    else        return false;}bool CFraction::operator==(const CFraction &c){    if(*this-c!=0)        return false;    else        return true;}bool CFraction::operator>=(const CFraction &c){    if(*this<c)        return false;    else        return true;}bool CFraction::operator<=(const CFraction &c){    if(*this>c)        return false;    else        return true;}bool CFraction::operator!=(const CFraction &c){    if(*this>c||*this<c)        return true;    else        return false;}int main(){    CFraction x,y,z;    cout<<"x:";    cin>>x;    cout<<"y:";    cin>>y;    z=+x+y;    cout<<"x+y="<<z<<endl;    z=+x-y;    cout<<"x-y="<<z<<endl;    z=x*y;    cout<<"x*y="<<z<<endl;    z=x/y;    cout<<"x/y="<<z<<endl;    cout<<"-x="<<-x<<endl;    cout<<"+x="<<+x<<endl;    cout<<"x的倒数: "<<~x<<endl;    if(x>y)        cout<<"x>y"<<endl;    if(x<y)        cout<<"x<y"<<endl;    if(x==y)        cout<<"x=y"<<endl;    cout<<endl;    return 0;}