第13周项目1 （4）

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/* *copyright(c) 2016,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：李硕 *版本：Code::Blocks * *问题描述：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，使程序读起来自然。 *输入描述： *程序输出：*/#include <iostream>#include <Cmath>using namespace std;class CFraction{private:    int nume;  // 分子    int deno;  // 分母public:    CFraction(int nu=1,int de=1):nume(nu),deno(de){}    void simplify();    void display();    CFraction operator+(const CFraction &c);//两个分数相加，结果要化简    CFraction operator-(const CFraction &c);//两个分数相减，结果要化简    CFraction operator*(const CFraction &c);//两个分数相乘，结果要化简    CFraction operator/(const CFraction &c);//两个分数相除，结果要化简    CFraction operator+(int a);    CFraction operator-(int a);    CFraction operator*(int a);    CFraction operator/(int a);    CFraction operator+();//取正一目运算    CFraction operator-();//取反一目运算    CFraction operator~();//取倒数一目运算    friend istream &operator>>(istream &in,CFraction &x);    friend ostream &operator<<(ostream &out,CFraction &x);    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);};istream &operator>>(istream &in,CFraction &x){    char c;    while(1)    {        cin>>x.nume>>c>>x.deno;        if(x.deno==0)            cerr<<"分母为0，请重新输入\n";        else if(c!='/')            cerr<<"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;}void CFraction::display(){    cout<<nume<<"/"<<deno<<endl;}//分数简化void CFraction::simplify(){    int m,n,t;    n=fabs(deno);    m=fabs(nume);    while(t=m%n)// 求m，n的最大公约数    {       m=n;       n=t;    }    deno/=n;    nume/=n;    if(deno<0)    {      deno=-deno;      nume=-nume;    }}CFraction CFraction::operator+(const CFraction &c){    CFraction t;    t.nume=nume*c.deno+c.nume*deno;    t.deno=deno*c.deno;    t.simplify();    return t;}CFraction CFraction::operator-(const CFraction &c){   CFraction t;   t.nume=nume*c.deno-c.nume*deno;   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+(int a){    CFraction t;    int c;    c=a*deno;    t.deno=deno;    t.nume=nume+c;    t.simplify();    return t;}CFraction CFraction::operator-(int a){    CFraction t;    int c;    c=a*deno;    t.deno=deno;    t.nume=nume-c;    t.simplify();    return t;}CFraction CFraction::operator*(int a){    CFraction t;    t.deno=deno;    t.nume=nume*a;    t.simplify();    return t;}CFraction CFraction::operator/(int a){    CFraction t;    t.deno=deno*a;    t.nume=nume;    t.simplify();    return t;}CFraction CFraction::operator+(){  return *this;}CFraction CFraction::operator-(){    CFraction t;    t.nume=-nume;    t.deno=deno;    return t;}CFraction CFraction::operator~(){    CFraction t;    t.nume=deno;    t.deno=nume;    if(t.deno<0)//保证负分数的负号在分子上    {        t.deno=-t.deno;        t.nume=-t.nume;    }    return t;}bool CFraction::operator>(const CFraction &c){    int n1,d1;    n1=nume*c.deno-c.nume*deno;    d1=deno*c.deno;    if(n1*d1>0)        return true;    return false;}bool CFraction::operator<(const CFraction &c){    int n1,d1;    n1=nume*c.deno-c.nume*deno;    d1=deno*c.deno;    if(n1*d1<0)        return true;    return false;}bool CFraction::operator==(const CFraction &c){    if(*this!=c)        return false;    return true;}bool CFraction::operator!=(const CFraction &c){    if(*this==c)        return false;    return true;} bool CFraction::operator>=(const CFraction &c){    if(*this<c)        return false;    return true;} bool CFraction::operator<=(const CFraction &c){    if(*this>c)        return false;    return true;}int main(){    char c;    int n,d;    cout<<"输入分数的样例：x/y"<<endl;    cin>>n>>c>>d;    CFraction x(n,d);    x.display();    cin>>n>>c>>d;    CFraction y(n,d);    y.display();    CFraction s;    s=x+y;    cout<<"x+y=";    s.display();    cout<<endl;    s=x-y;    cout<<"x-y=";    s.display();    cout<<endl;    s=x*y;    cout<<"x*y=";    s.display();    cout<<endl;    s=x/y;    cout<<"x/y=";    s.display();    cout<<endl;    cout<<"请输入要进行运算的整数d"<<endl;    cin>>d;    s=x+d;    cout<<"x+d=";    s.display();    cout<<endl;    s=x-d;    cout<<"x-d=";    s.display();    cout<<endl;    s=x*d;    cout<<"x*d=";    s.display();    cout<<endl;    s=x/d;    cout<<"x/d=";    s.display();    cout<<endl;    if(x>y)        cout<<"大于！"<<endl;    if(x<y)        cout<<"小于! "<<endl;    if(x==y)        cout<<"等于！"<<endl;    return 0;}
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