Problem F: 分数类的类型转换

#include <bits/stdc++.h>
using namespace std;
int gcd(int a,int b)
{
    return b==0?a:gcd(b,a%b);
}
class Fract
{
public:
    int n,m;
    Fract(int a=0,int b=0):n(a),m(b){}
    void show()
    {
        int t=gcd(n,m);
        int x=n/t;
        int y=m/t;
        if(x==0||y==1)
            cout<<x<<endl;
        else
        {
            if(x*y<0)
                cout<<"-"<<abs(x)<<"/"<<abs(y)<<endl;
            else
                cout<<abs(x)<<"/"<<abs(y)<<endl;
        }
    }
    operator double ()
    {
        if(n==0)
            return (double)0;
        else
            return (double)n/m;
    }
};
int main()
{
    int n, m;
    while(cin >> n >> m)
    {
        Fract fr(n, m);
        cout << (double)fr << " ";
        fr.show();
    }
}