分数的运算符重载（续）

来源：互联网发布：中软国际python面试题编辑：程序博客网时间：2024/05/16 05:55
代码：
#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;    n=fabs(deno);    m=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)            cerr<<"分母为0, 请重新输入\n";        else if(ch!='/')            cerr<<"格式错误（形如m/n）! 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+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;    if (!c.nume) return *this;    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=c.nume*deno;    common_deno=deno*c.deno;    if ((this_nume-c_nume)*common_deno>0) return true;    return false;}bool CFraction::operator<(const CFraction &c){    int this_nume,c_nume,common_deno;    this_nume=nume*c.deno;    c_nume=c.nume*deno;    common_deno=deno*c.deno;    if ((this_nume-c_nume)*common_deno<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 || *this<c) 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;}int main(){    CFraction x,y,s;    cout<<"输入x: ";    cin>>x;    cout<<"输入y: ";    cin>>y;    s=+x+y;    cout<<"x+y="<<s<<endl;    s=x-y;    cout<<"x-y="<<s<<endl;    s=x*y;    cout<<"x*y="<<s<<endl;    s=x/y;    cout<<"x/y="<<s<<endl;    cout<<"-x="<<-x<<endl;    cout<<"+x="<<+x<<endl;    cout<<"x的倒数: "<<~x<<endl;    cout<<x;    if (x>y) cout<<"大于";    if (x<y) cout<<"小于";    if (x==y) cout<<"等于";    cout<<y<<endl;    return 0;}
运算结果：
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