utility.cpp

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bool user_says_yes()
{
   int c;
   bool initial_response = true;

   do {  //  Loop until an appropriate input is received.
      if (initial_response)
         cout << " (y,n)? " << flush;

      else
         cout << "Respond with either y or n: " << flush;

      do { //  Ignore white space.
         c = cin.get();
      } while (c == '\n' || c ==' ' || c == '\t');
      initial_response = false;
   } while (c != 'y' && c != 'Y' && c != 'n' && c != 'N');
   return (c == 'y' || c == 'Y');
}