C++程序设计实践指导1.6分数运算改写要求实现

改写要求：重载>>和<<实现分数类对象的直接输入输出，重载+完成多个分数对象加法

#include <cstdlib>

#include <iostream>

using namespace std;

class Fract

{

      int num,den;

      public:

             friend ostream& operator << (ostream& output,Fract& temp);

             friend istream& operator >> (istream& intput,Fract& temp1);

             Fract operator + (Fract& temp1);

             int gcd(int m,int n)

             {

                 int r;

                 if(m<n)

                 {

                        r=m;m=n;n=r;

                 }

                 while(r=m%n)

                 {

                      m=n;

                      n=r;

                 }

                 return n;

             }

};

istream& operator >>(istream& input,Fract& temp1)

{

         input>>temp1.num>>temp1.den;

         return input;

}

ostream& operator <<(ostream& output,Fract& temp)

{

         output<<temp.num<<"/"<<temp.den<<endl;

         return output;

}

Fract Fract::operator + (Fract& temp1)

{

         Fract sum;

         int x,y,temp;

         x=num*temp1.den+den*temp1.num;

         y=den*temp1.den;

         temp=gcd(x,y);

         x=x/temp;

         y=y/temp;

         sum.num=x;

         sum.den=y;

         return sum;

}

int main(int argc, char *argv[])

{

    Fract temp1,temp2,temp;

    cin>>temp1>>temp2;

    temp=temp1+temp2;

    cout<<temp;

    system("PAUSE");

    return EXIT_SUCCESS;

}