#include<iostream>
#include<string>
using namespace std;

    class fraction;
    //const fraction  operator=(const fraction &f1,const fraction &f2);
    const fraction  operator+(const fraction &f1,const fraction &f2);
    const fraction  operator-(const fraction &f1,const fraction &f2);
    const fraction  operator*(const fraction &f1,const fraction &f2);
    const fraction  operator/(const fraction &f1,const fraction &f2);
    


class fraction
{
public:
    fraction(int aa,int bb);
    fraction();
    ~fraction();
    int getab(int a,int b);
    void const show();


    const fraction &  operator=(const fraction &f);
    friend const fraction  operator+(const fraction &f1,const fraction &f2);
    friend const fraction  operator-(const fraction &f1,const fraction &f2);
    friend const fraction  operator*(const fraction &f1,const fraction &f2);
    friend const fraction  operator/(const fraction &f1,const fraction &f2);
    
private:
    int a;//分子
    int b;//分母

};


//fraction 类成员函数的实现

fraction::fraction(int aa ,int bb ):a(aa),b(bb)
{
    //a = aa;
    //b = bb;
}

fraction::fraction()
{
    a = 0;
    b = 1;
}

fraction::~fraction()
{

}

int fraction::getab(int aa,int bb)
{
    a = aa;
    b = bb;
    return 0;
}

void const fraction::show()
{
    cout<<"("<<a<<"/"<<b<<")";
}

const fraction & fraction::operator=(const fraction &f)
{
    a = f.a;
    b = f.b;
    return *this;

}


//////////////////////////////////////////////////////////////////////
//运算符重载


const fraction operator+(const fraction &f1,const fraction &f2)
{
    fraction fra;
    fra.a = (f1.a*f2.b + f1.b*f2.a);
    fra.b = (f1.b*f2.b);
    return fra;
}

const fraction operator-(const fraction &f1,const fraction &f2)
{
    fraction fra;
    fra.a = (f1.a*f2.b - f1.b*f2.a);
    fra.b = (f1.a*f2.b);
    return fra;
}

const fraction operator*(const fraction &f1,const fraction &f2)
{
    fraction fra;
    fra.a = (f1.a*f2.a);
    fra.b = (f1.a*f2.b);
    return fra;
}

const fraction operator/(const fraction &f1,const fraction &f2)
{
    fraction fra;
    fra.a = (f1.a*f2.b);
    fra.b = (f1.b*f2.a);
    return fra;
}
////////////////////////////////////////////////////////////////

int main()
{
    fraction fen1(1,2);
    //fen1.show();
    //cout<<endl;

    fraction fen2(5,6);
    //fen2.show();
    //cout<<endl;

    fraction fen3,fen4,fen5,fen6;
    
    fen3 = (fen1 + fen2);
    fen1.show();
    cout<< "+" ;
    fen2.show();
    cout<< " = " ;
    fen3.show();
    cout<< endl;

    fen4 = (fen2 - fen1);
    fen1.show();
    cout<< "-" ;
    fen2.show();
    cout<< " = " ;
    fen4.show();
    cout<< endl;

    fen5 = (fen2 * fen1);
    fen1.show();
    cout<< "*" ;
    fen2.show();
    cout<< " = " ;
    fen5.show();
    cout<< endl;

    fen6 = (fen1 / fen2);
    fen1.show();
    cout<< " / " ;
    fen2.show();
    cout<< " = " ;
    fen6.show();
    cout<< endl;




    return 0;
}