三个数中输出其中最小的

#include <iostream>
using namespace std;
int main ()
{
int a,b,c;
int f(int x,int y,int z);
cin >>a>>b>>c;
c = f(a,b,c);
cout<<c<<endl;
return 0;
}
int f(int x,int y,int z)
{
int m;
if(x<y) m=x;
 else m=y;
if(z<m) m=z;
return (m);
}