#include <iostream.h>  // for cout << and cin >>
#include <ctype.h>     // for toupper(char)

char menuOption()
{ // The user eventually enters either an n, and o, or an s.  
  // POST: Return an upper case N, O or S
  char option;
  do {
    cout << "Enter N)ew, O)pen, S)ave: ";
    cin >> option;
    option = toupper(option);  // toupper is from ctype.h
  } while (option != 'N' &&
           option != 'O' &&
           option != 'S');
  return option;
}

int main()
{
  // POST: Shows the user selected option
  cout << "The user entered " << menuOption() << endl;
  return 0;
}