Weight conversion program using functions in c++

#include<iostream>
using namespace std;
int num(int n)
{
cout<<"num of chocolate:";
cin>>n;
return n;
}
int ounce(int a)
{
cout<<"weight in ounce:";
cin>>a;
return a;
}
int pound(int b)
{
cout<<"weight in pound:";
cin>>b;
return b;
}
int main ()
{
int n, a, b;
char choice;
cout<<"enter choice 'o' for ounce and 'p' for pounds:";
cin>>choice;
int x, y, z;
x = num(n);
y = ounce(a);
z = pound(b);
if (choice == 'o')
{cout<<"total weight in ounce:"<<x*y;}
if (choice == 'p')
{cout<<"total weight in pounds:"<<x*z;}
return 0;
}
**************************
Output: