分数相加减的代码（c++）

#include <iostream>

using namespace std;

int gy(int a,int k1)

{int min;

if(a>k1)min=k1;

else min=a;

    while(min)

    {   if(a%min==0&&k1%min==0)

           {if(k1/min==1) cout<<a/min<<endl;

               else cout<<a/min<<'/'<<k1/min<<endl;

            break;  

            }

         min--;

    }

return 0;

}

int main()

{int a,b,c,d,k1,g;

    char x1,j1,j2;

    while(cin>>a>>j1>>b>>x1>>c>>j2>>d)

    {k1=b*d;

    a=a*d;c=b*c;

    if(x1=='-')

        {a=a-c;

        if(a==0)

            cout<<'0'<<endl;

        if(a<0){a=-a;cout<<"-";gy(a,k1);}

        else {gy(a,k1);}

         }

         if(x1=='+')

         {a=c+a;

         if(a==0)

            cout<<'0'<<endl;

         else gy(a,k1);

         }

}

    cout<<endl;

return 0;

}