// Code derived from Stroustrup's PPP2 book
// § 4.5 Functions
//  -and beginning on p 113

#include <iostream>

using std::cout;

// return the square of x
int square(int x) { return x * x; }

int main()
{
  cout << square(2) << '\n';   // print 4
  cout << square(10) << '\n';  // print 100
}