/*
 **************************************************************************
 * Program name : 008_character_set (Version 1.00)                        *
 * Author       : Duck Wong                                               *
 * Language     : C / C++                                                 *
 * Compiler     : Boodshed Dec-C++ compiler Ver 3.95                      *
 * Computer     : PII350                                                  *
 * O/S          : Windows 98                                              *
 **************************************************************************
 * Version 1.00 : 2000/06/04 - first version                              *
 **************************************************************************
 * Description  : (a) input start from which character                    *
 *                (b) input no. of character to be listed                 *
 *                (c) output results                                      *
 **************************************************************************
*/
#include <iostream.h>
#include <stdlib.h>

int main()
{
 // part 1 : declaration
 int   Start, Number, Index;
 char  Again;

 do {
     // part 2 : input (a) start from which character
     //                (b) no. of character to be listed
     do {
         cout << "\n\nStart from which character number ( >=32 ) : ";
         cin  >> Start;
         if (Start < 32 || Start > 255)
           cout << "\n\aInvolid character number! (Must be >= 32) \n";
        } while (Start < 32 || Start > 255);

     do {
         cout << "\n\nHow many characters do you want to print ( 1 - "
              << 255-Start+1 << " ) : ";
         cin  >> Number;
         if (Number < 1)
            cout << "\n\aIt must be a positive number!\n";
        } while  (Number < 1 || Start+Number > 256);

     // part 3 : output
     cout << "\nThese characters are :\n\n";
     Index = 0;
     do {
         cout << Start+Index << "= "
              << char (Start+Index) << "\t\t";                 // note (1) & (2)
         ++Index;                                                    // note (3)
        } while (Index < Number);

   // part 4 : try another number ?
   cout << "\n\n\tTry again (Y/N) : ";
   cin  >> Again;
   cout << "\n";
  } while (Again=='Y' || Again=='y');
 cout << "\n" << endl;

 system("PAUSE");
 return 0;
}

/* NOTES
   (1)  (char) (integer number) or char (integer number)
         = CHR(integer number) in Pascal

   (2)  (int) 'A' or int ('A')
         = ORD('A') in Pascal

   (3)  ++ Index           or
        Index += 1         or
        Index = Index + 1

        equals to the statement : 

          Index:=Index+1 

        in Pascal.
*/