//==clearScreen===========================================
// pre:  on an operating system that understands signals
// post: clears a terminal window
//========================================================
void clearScreen()
{
   cout << char(27) << "[;H" << char(27) << "[2J" << '\n';
}

//==waitForKeyPress===========================================
// pre:  none
// post: has read a key press input form the keyboard and
// consumed that key
//========================================================
void waitForKeyPress()
{
     cout << "Press <return> to continue.";
     cin.ignore();
     cin.ignore(); 
}