Taking cube of numbers using function in C++

#include <iostream>
int Cube ( int ) ; // prototype
using namespace std;

int main ()
{
   int      x;
   int      y ;

    x   = 14 ;
    y   =   9 ;

   cout <<"My Number ="  << y ;
   cout <<"and its cube is:"  << Cube (y) << endl ;

   cout <<"Your Number ="  << x ;
   cout <<"and its cube is:"  << Cube (x) << endl ;
   return 0;
}

int Cube ( int n)
{
    int a;
    a = n*n*n;
    return a;
}
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output: