/* Filename:  quetest.cpp

   Programmer:  Br. David Carlson

   Date:  April 13, 1998.

   Last Revised:  December 4, 2001

   This is a menu-driven program that allows the user to insert items
   (floating-point numbers) into a queue, to remove them, and to check
   if the queue is empty.

   Tested with:
      Microsoft Visual C++ 6.0
      Microsoft Visual C++ .NET
      g++ under Linux
*/

#include <cctype>      // for the tolower function
#include "lstqueue.h"


/* Given:  Nothing.
   Task:   To present a menu of available options on screen.
   Return: Nothing.
*/
void Menu(void)
   {
   cout << endl << "Menu of available Queue options:" << endl;
   cout << "   I   Insert an item" << endl;
   cout << "   R   Remove an item" << endl;
   cout << "   E   Check if queue is empty" << endl;
   cout << "   Q   Quit" << endl << endl;
   }


/* Given:  Nothing.
   Task:   To read a letter from the keyboard indicating the
           user's choice.
   Return: This letter (in upper case) in the function name.
*/
char GetChoice(void)
   {
   char Temp;

   cin >> Temp;
   Temp = toupper(Temp);
   return Temp;
   }


int main(void)
   {
   LstQueClass Queue;
   float Num;
   char Choice;

   Menu();
   cout << "Enter the letter for your choice: ";
   Choice = GetChoice();

   while (Choice != 'Q')
      {
      if (Choice == 'I')
         {
         cout << "Enter the float to insert into the queue: ";
         cin >> Num;
         Queue.Insert(Num);
         }
      else if (Choice == 'R')
         {
         Queue.Remove(Num);
         cout << "The number removed was: " << Num << endl;
         }
      else if (Choice == 'E')
         {
         if (Queue.Empty())
            cout << "The queue is empty" << endl;
         else
            cout << "The queue is not empty" << endl;
         }
      else if (Choice != 'Q')
         cout << "Invalid Choice. You must use I, R, E, or Q." << endl;

      Menu();
      cout << "Enter the letter for your choice: ";
      Choice = GetChoice();
      }

   return 0;
   }