// Fig. 6.13: fig06_13.cpp
// square function used to demonstrate the function 
// call stack and activation records.
#include <iostream>
using std::cin;
using std::cout;
using std::endl;

int square( int ); // prototype for 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

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



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