//
// Filename:      pgm3_3b.cpp
//
// Description:   Demonstration of random number generation.
//
// ENSC 104:      Digital Computer Programming
//
// Instructor:    Dr. Walsh
//
// Section:       2
//
// Date Created:  03/03/98
// Last Modified: 03/03/98
//
// Name:          N/A
//

#include <iostream.h>
#include <iomanip.h>
#include <stdlib.h>
#include <stdio.h>
#include <time.h>

const int MAX_NUM = 6;
const int SPACING = 5;
const int NUM_OBS = 20;
const int NUM_PER_LINE = 10;

int main( int argc, char *argv[] )
   {
   int i;
   int randon_num;
 
   //
   // Will ALWAYS generate the same 'random' numbers.
   //
   cout << "Without 'seed'!\n";

   for ( i=1; i<=NUM_OBS; i++)
      {
      random_num = 1 + rand() % MAX_NUM;
      cout << setw(SPACING) << random_num;
      if ( !(i%NUM_PER_LINE) )
         {
         cout << endl;
         }
      }


   // Will NOT always generate the same 'random' numbers.
   // You want to use the 'srand() to get a different 
   // sequence of random numbers each time.

   srand( time( NULL) );

   cout << "\nWith 'seed'!\n";

   for ( i=1; i<=NUM_OBS; i++)
      {
      random_num = 1 + rand() % MAX_NUM;
      cout << setw(SPACING) << random_num;
      if ( !(i%NUM_PER_LINE) )
         {
         cout << endl;
         }
      }

   return 0;
   }