#include <iostream>

using namespace std;

int main()
{
  int square(int x);
  int x = 2;
  cout << "Before calling square(), x is " << x << endl;
  int x2 = square(x);
  cout << "The square is " << x2 << endl;
  cout << "After calling square(), x is " << x << endl; 
  return 0;
}

int square(int x)
{
  x = x * x;
  return(x);
}