From: mrh99 AT uswest DOT net (Matthew Haley)
Newsgroups: comp.os.msdos.djgpp
Subject: Re: srand()
Organization: Home
Message-ID: <37ec69fb.17055060@news.uswest.net>
References: <7shlcr$bn2$1 AT canopus DOT cc DOT umanitoba DOT ca>
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Date: Sat, 25 Sep 1999 06:49:17 GMT
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

Hi Randy , 

I learn best by example so here's a simple C program:

/*** srand_demo.c ***/
#include <stdio.h>	/* printf(), NULL 			*/
#include <stdlib.h>	/* srand(), EXIT_SUCCESS 	*/
#include <time.h>	/* time() 					*/

#define RANDOM_RANGE	32767

int main(void)
{
	int iRandomNumber;

	srand(time(NULL));
	iRandomNumber = rand() % RANDOM_RANGE;

	printf("Here's a random number between 0 and %i -> %i\n",
			RANDOM_RANGE, iRandomNumber);

	return (EXIT_SUCCESS);
}

/*** end of srand_demo.c */

As an aside, I built this program with lcc-Win32 (I don't have DJGPP
installed right now :), then ran it 645 times and it actually produced
numbers between ~28,000 and ~30,000 so it's not the best way to get
random numbers, unless you modify the result with a bit more math.

 On Fri, 24 Sep 1999 23:57:58 -0400,
 <<Randy>> wrote:

>To use rand() one should call srand() with a seed...
>Is there a really simple way to get the time?  Would I have to include
>time.h?
>
>
>

===================================
Matthew Haley
mhaley99 AT homemail DOT com
http://www.users.uswest.net/~mrh99
===================================