escuse me!我的代码到底是哪的bug?

#include<stdio.h>
using namespace std;
int gcd(int m,int n){
    return !n?m:gcd(n,m%n);
}

int max(int a,int b){
    return a>b?a:b;
}

int min(int a,int b){
    return a<b?a:b;
}

int main(){
    int a,b,c,x,y;
    scanf("%d%d%d",&a,&b,&c);
    x=max(a,max(b,c));
    y=min(a,min(b,c));
    printf("%d/%d",x/gcd(x,y),y/gcd(x,y));
    return 0;
}