Read the keyboard buffer and terminate

Listing 4 blocks and waits for the user to press a key on the keyboard

Listing 4. Read the keyboard buffer and terminate. 
  //Block and wait until the user presses a key.
  readkey();
  
  //Destroy bitmaps to avoid memory leaks.
  destroy_bitmap(picA);
  destroy_bitmap(picB);

  return 0;//Return 0 to indicate a successful run.
}//end main function
END_OF_MAIN()

When the user presses any key, the program destroys the two memory bitmaps and terminates.