// Demonstrating global and local variables.
  #include <iostream.h>
 void myFunction(); // prototype

 int x = 5, y = 7; // global variables
 int main()
 {

 cout << "x from main: " << x << "\n";
 cout << "y from main: " << y << "\n\n";
 myFunction();
 cout << "Back from myFunction!\n\n";
 cout << "x from main: " << x << "\n";
 cout << "y from main: " << y << "\n";
 return 0;
 }

 void myFunction()
 {
 int y = 10;

 cout << "x from myFunction: " << x << "\n";
 cout << "y from myFunction: " << y << "\n\n";
 }