/*
 **************************************************************************
 * Program name : 021_Random_Numbers (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 : 2000/06/11 - first version                              *
 **************************************************************************
 * Description  : (a) Asking the number of set                            *
 *                (b) Asking the number of numbers in each set            *
 *                (c) Asking the smallest value                           *
 *                (d) Asking the largest value                            *
 *                (e) Draw random numbers                                 *
 *                (f) Try again ?                                         *
 **************************************************************************
*/
#include <iostream.h>
#include <stdlib.h>
#include <iomanip.h>
#include <time.h>

int main()
{
 // part 1 : declaration
 int   Index_1, Index_2, Num_Of_sets, Member, Max, Min;
 char  Again;

 do {
     // part 2 : Repeat asking the number of set
     do {
         cout << "How many set of numbers do you want (1-10) ? ";
         cin  >> Num_Of_sets;
        } while (Num_Of_sets < 1 || Num_Of_sets > 10 );

     // part 3 : Repeat asking the number of numbers in each set
     do {
         cout << "How many numbers in each set do you need (1-10) ? ";
         cin  >> Member;
        } while (Member < 1 || Member > 10 );

     // part 4 : Repeat asking the smallest value
     do {
         cout << "The lower limit (smallest value) is ? ";
         cin  >> Min;
        } while (Min < 1 );

     // part 5 : Repeat asking the largest value
     do {
         cout << "The upper limit (largest value) is ? ";
         cin  >> Max;
        } while (Max <= Min );

     // part 6 : Draw random numbers
     srand(time(NULL));                                         // Note (1)
     for (Index_1=1; Index_1<=Num_Of_sets; Index_1++)           // Note (2)
       {
        cout << "\n\tSet " << setw(2) << Index_1 << " : ";
        for (Index_2=1; Index_2<=Member; Index_2++)             // Note (3)
          cout << setw(5) << Min + (rand() % (Max-Min+1));      // Note (4)
       }
     cout << "\n\n";

     // part 7 : try again ?
     cout << "\n\t\aTry again (Y/N) : ";
     cin  >> Again;
     cout << "\n";
    } while (Again=='Y' || Again=='y');
 cout << "\n" << endl;

 system("PAUSE");
 return 0;
}

/* Notes
   (1) srand(time(NULL));  (acts as the keyword Randomize in PASCAL)
       This statement causes the computer to read its clock to obtain the
       value for seed automatically. Thus different sequence of random numbers
       is obtained each time the program is run.

   (2) Use Num_Of_sets to control number of lines

   (3) Use Member to control the number of random numbers listed per each line

   (4) When using the function rand, the width of the range is determined by
       the number used to scale rand with the modulus operator, and the
       starting number of the range is equal to the number that is added.

       Example :  Let's say Min is 3 and Max is 10 , then
                  Min + (rand() % (Max-Min+1))
                =   3 + (rand() % (10 -3  +1))
                =   3 + (rand() % 8)
                will generate number from 3 to 10.
*/