c++运算符重载

#include<iostream>
#include<cstdio>
using namespace std;
class complex
{
    int x,y;
public:
    complex(int a=0,int b=0)
    {
        x=a;
        y=b;
    }
    void print();
    friend complex operator + (complex a,complex b);
    friend complex operator - (complex a,complex b);
    friend complex operator * (complex a,complex b);
    friend complex operator / (complex a,complex b);
}; 
int gcd(int a,int b)
{
    return b==0?a:gcd(b,a%b);
}
void complex::print()
{
    if(x==y||x==0)
        cout<<x<<endl;
    else
        cout<<x<<"/"<<y<<endl;
}
complex operator + (complex a,complex b)
{
    complex temp;
    temp.x=a.x*b.y+b.x*a.y;
    temp.y=a.y*b.y;
    int g=gcd(temp.x,temp.y);
    temp.x/=g;
    temp.y/=g;
    return temp;
}
complex operator - (complex a,complex b)
{
    complex temp;
    temp.x=a.x*b.y-b.x*a.y;
    temp.y=a.y*b.y;
    int g=gcd(temp.x,temp.y);
    temp.x/=g;
    temp.y/=g;
    return temp;
}
complex operator * (complex a,complex b)
{
    complex temp;
    temp.x=a.x*b.x;
    temp.y=a.y*b.y;
    int g=gcd(temp.x,temp.y);
    temp.x/=g;
    temp.y/=g;
    return temp;
}
complex operator / (complex a,complex b)
{
    complex temp;
    temp.x=a.x*b.y;
    temp.y=a.y*b.x;
    int g=gcd(temp.x,temp.y);
    temp.x/=g;
    temp.y/=g;
    return temp;
}
int main()
{
    ios::sync_with_stdio(false); 
    int num;
    while(cin>>num)
    {
        while(num--)
        {
            int aa,bb,cc,dd;
            char e,g;
            cin>>aa>>e>>bb>>cc>>g>>dd;
            complex c1(aa,bb),c2(cc,dd),c3;
            c3=c1+c2;
            c3.print();
            c3=c1-c2;
            c3.print();
            c3=c1*c2;
            c3.print();
            c3=c1/c2;
            c3.print();
        }
    }
    return 0;
}