#include <iostream>
using namespace std;


int square( int x ) // x is a local variable
{
   return x * x; // calculate square and return result
} // end function square

int main()
{
   int a = 10; // value to square (local automatic variable in main)

   cout << a << " squared: " << square( a ) << endl; // display a squared
   return 0; // indicate successful termination
} // end main