2015年第八周项目三：分数类中的运算符重载（2）

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#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 display();    void simplify();//化简（使分子分母没有公因子）    //放大n倍，如2/3放大5倍为10/3    bool operator > ( CFraction& c);    bool operator < ( CFraction& c);    bool operator >= ( CFraction& c);    bool operator <= ( CFraction& c);    bool operator == ( CFraction& c);    bool operator != ( CFraction& c);    //二目的加减乘除运算符的重载    CFraction operator+( CFraction& c);    CFraction operator-( CFraction& c);    CFraction operator*( CFraction& c);    CFraction operator/( CFraction& c);    CFraction operator+( int c);    CFraction operator-( int c);    CFraction operator*( int c);    CFraction operator/( int c);    friend CFraction operator+(int m,CFraction &c);    friend CFraction operator-(int m,CFraction &c);    friend CFraction operator*(int m,CFraction &c);    friend CFraction operator/(int m,CFraction &c);};CFraction operator+(int m,CFraction &c){    CFraction t;    t.nume=c.nume+m*c.deno;    t.simplify();    return t;}CFraction operator-(int m,CFraction &c){    CFraction t;    t.nume=m*c.deno-c.nume;    t.simplify();    return t;}CFraction operator*(int m,CFraction &c){    CFraction t;    t.nume=c.nume*m;    t.simplify();    return t;}CFraction operator/(int m,CFraction &c){    CFraction t;  //除法无效时，这种情况需要考虑，但这种处理仍不算合理    t.nume=m*c.deno;    t.deno=c.nume;    t.simplify();    return t;}CFraction CFraction::operator+(int c){    CFraction t;    t.nume=nume+c*deno;    t.simplify();    return t;}CFraction CFraction::operator-(int c){    CFraction t;    t.nume=nume-c*deno;    t.simplify();    return t;}CFraction CFraction::operator*(int c){    CFraction t;    t.nume=nume*c;    t.simplify();    return t;}CFraction CFraction:: operator/(int c){    CFraction t;    if (!c) return *this;   //除法无效时，这种情况需要考虑，但这种处理仍不算合理    t.nume=nume/c;    t.simplify();    return t;}void  CFraction::display(){    cout<<nume<<"/"<<deno<<endl;}bool CFraction::operator>( CFraction& c){    if((nume*c.deno)>(c.nume*deno))return true;    else return false;}bool CFraction::operator==( CFraction& c){    if((nume*c.deno)==(c.nume*deno))return true;    else return false;}bool CFraction::operator<( CFraction& c){    if(*this>c||*this==c)return false;    else return true;}bool CFraction::operator>=( CFraction& c){    if(*this<c)return false;    else return true;}bool CFraction::operator<=( CFraction& c){    if(*this>c)return false;    else return true;}bool CFraction::operator!=( CFraction& c){    if(*this==c)return false;    else return true;}CFraction CFraction:: operator+( CFraction& c){    CFraction t;    t.nume=nume*c.deno+c.nume*deno;    t.deno=deno*c.deno;    t.simplify();    return t;}CFraction CFraction:: operator-( CFraction& c){    CFraction t;    t.nume=nume*c.deno-c.nume*deno;    t.deno=deno*c.deno;    t.simplify();    return t;}CFraction CFraction:: operator*( CFraction& c){    CFraction t;    t.nume=nume*c.nume;    t.deno=deno*c.deno;    t.simplify();    return t;}CFraction CFraction:: operator/(CFraction &c){    CFraction t;    if (!c.nume) return *this;   //除法无效时，这种情况需要考虑，但这种处理仍不算合理    t.nume=nume*c.deno;    t.deno=deno*c.nume;    t.simplify();    return t;}CFraction::CFraction(int nu,int de) //构造函数，初始化用{    if (de!=0)    {        nume=nu;        deno=de;    }    else    {        cerr<<"初始化中发生错误，程序退出\n";        exit(0);    }}void CFraction::set(int nu,int de)    //置值，改变值时用{    if (de!=0) //如果不合适，改变值操作无效    {        nume=nu;        deno=de;    }}// 分数化简，使分子分母没有公因子void CFraction::simplify(){    int n=gcd(deno, nume);    deno/=n;     // 化简    nume/=n;}// 求m，n的最大公约数int gcd(int m, int n) //这个函数可以定义为类的成员函数，也可以为一般函数{    int r;    if (m==0)    {        return n;    }    while(r=m%n)  // 求m，n的最大公约数    {        m=n;        n=r;    }    return n;}int main(){    CFraction x(1,3),y(-5,10),s;    cout<<"分数x=1/3      y=-5/10"<<endl;    s=x+y;    cout<<"x+y=";    s.display();    s=x-y;    cout<<"x-y=";    s.display();    s=x*y;    cout<<"x*y=";    s.display();    s=x/y;    cout<<"x/y=";    s.display();    s=x+y;    cout<<"x+y=";    s.display();    x.display();    if (x>y) cout<<"大于"<<endl;    if (x<y) cout<<"小于"<<endl;    if (x==y) cout<<"等于"<<endl;    y.display();    cout<<endl;    CFraction c1(5,3),c2;    //以下建议在调试环境中完成测试，    c2=c1+5;    c2=5+c1;    c2=c1-5;    c2=5-c1;    c2=c1*5;    c2=5*c1;    c2=c1/5;    c2=5/c1;    return 0;}
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