#include <iostream>
void myFunction();           // prototype
  
int x = 5, y = 7;            // global variables
int main()
{
   using namespace std;
  
   cout << "x from main: " << x << endl;
   cout << "y from main: " << y << endl << endl;
   myFunction();
   cout << "Back from myFunction!" << endl << endl;
   cout << "x from main: " << x << endl;
   cout << "y from main: " << y << endl;

   system("PAUSE");  // prevent the console window from closing
   return 0;
}
  
void myFunction()
{
   using std::cout;
 
   int y = 10;
  
   cout << "x from myFunction: " << x << endl;
   cout << "y from myFunction: " << y << endl << endl;
}