第一次打卡

不确定情况，代码只留了最后一次写的

#include <bits/stdc++.h>
using namespace std;
class number
{
    int fz,fm;
    friend number operator+(number &n1,number &n2);
public:
    number(int a=0,int b=1)
    {
        fz=a;
        fm=b;
    }
    friend int gcd(int a,int b);
    friend int min_gb(number &n1,number &n2);
    int show()
    {
        cout<<fz;
        if(fm!=1) cout<<" "<<fm;
    }
};

int gcd(int a,int b)
{
    if(b==0) return a;
   else return gcd(b,a%b);
}

int min_gb(number &n1,number &n2)
{
    return n1.fm*n2.fm/gcd(n1.fm,n2.fm);
}
number operator+(number &n1,number &n2)
{
    number nn;
    int a=min_gb(n1,n2);
    nn.fm=a;
    nn.fz=(a/n1.fm)*n1.fz+(a/n2.fm)*n2.fz;
    int b=gcd(nn.fz,nn.fm);
    if(b!=1)
    {
        nn.fz=nn.fz/b;
        nn.fm=nn.fm/b;
    }
    return nn;
}

int main()
{
    int a,b,c,d;
    cin>>a>>b>>c>>d;
    number num1(a,b);
    number num2(c,d);
    number num3;
    num3=num1+num2;
    num3.show();
}