多文件组织求最大最小值

#include<iostream>
using namespace std;
int max(int x,int y);
int min(int x,int y);
int main()
{
    int a,b,c1,c2;
    cout<<"输入两个数";
    cin>>a>>b;
    c1=max(a,b);
    cout<<"max="<<c1<<endl;
    c2=min(a,b);
    cout<<"min="<<c2<<endl;
    return 0;
}

int max(int x,int y)
{
    int z;
    z=x>y?x:y;
    return(z);
}
int min(int x,int y)
{
    int z;
    z=x<y?x:y;
    return(z);
}