//
// do while example of a menu and its sub menu
//
//
#include <conio.h>
#include <iostream.h>

#define EXIT    5

#define OPTION_1     1
#define OPTION_2     2
#define OPTION_3     3
#define OPTION_4     4
#define OPTION_5     5

main()
   {
   int choice=0;
   int ichoice = 0;

   do {
      cout << "\tMAIN MENU\n";
      cout << "\t*********\n\n";

      cout << "\t1. Generate Data\n";
      cout << "\t2. Process Data\n";
      cout << "\t3. Display Data\n";
      cout << "\t4. Miscellaneous\n";
      cout << "\t5. Exit Program\n";

      cout << "\n\nEnter Choice: ";
      cin >> choice;

      switch( choice )
	 {
	 case OPTION_1:
	    do {
	       cout << "\tGENERATE DATA\n";
	       cout << "\t*************\n";
	       cout << "1. Generate Sinewave\n";
	       cout << "2. Generate Cosine\n";
	       cout << "3. Generate Noise\n";
	       cout << "4. Generate Pulse Train\n";
	       cout << "5. Return to Main Menu\n\n";

	       cout << "Enter choice: ";
	       cin >> ichoice;

	       switch( ichoice )
		  {
		  case 1:
		     cout << "Generating Sinewave...\n";
		     cout << "Press any key to continue...\n";
		     getch();
		     break;
		  case 2:
		     cout << "Generating Cosine...\n";
		     cout << "Press any key to continue...\n";
		     getch();
		     break;
		  case 3:
		     cout << "Generating Noise...\n";
		     cout << "Press any key to continue...\n";
		     getch();
		     break;
		  case 4:
		     cout << "Generating Pulse Train...\n";
		     cout << "Press any key to continue...\n";
		     getch();
		     break;
		  case 5:
		     break;
		  default:
		     cout << "*** Invalid Sub Menu Selection ***\n";
		     cout << "Press any key to continue...\n";
		     getch();
		     break;
		  }
	       } while ( ichoice !=5 );
	    break;

	 case OPTION_2:
	    cout << "Processing Data ...\n";
	    cout << "Press any key to continue...\n";
	    getch();
	    break;

	 case OPTION_3:
	    cout << "Displaying Data...\n";
	    cout << "Press any key to continue...\n";
	    getch();
	    break;

	 case OPTION_4:
	    cout << "Miscellaneous...\n";
	    cout << "Press any key to continue...\n";
	    getch();
	    break;

	 case OPTION_5:
	    cout << "Normal Termination of Program!\n";
	    cout << "Press any key to continue...\n";
	    getch();
	    break;

	 default:
	    cout << "*** INVALID OPTION ***\n";
	    cout << "Press any key to continue...\n";
	    getch();
	    break;
	 }
      } while ( choice != EXIT );

   return 0;
   }