Mail Archives: djgpp/1999/09/25/03:36:18
| From: | mrh99 AT uswest DOT net (Matthew Haley)
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| Newsgroups: | comp.os.msdos.djgpp
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| Subject: | Re: srand()
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| Organization: | Home
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| Message-ID: | <37ec69fb.17055060@news.uswest.net>
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| References: | <7shlcr$bn2$1 AT canopus DOT cc DOT umanitoba DOT ca>
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| X-Newsreader: | Forte Free Agent 1.11/32.235
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| Lines: | 46
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| Date: | Sat, 25 Sep 1999 06:49:17 GMT
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| NNTP-Posting-Host: | 209.181.102.70
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| X-Trace: | news.uswest.net 938241996 209.181.102.70 (Sat, 25 Sep 1999 01:46:36 CDT)
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| NNTP-Posting-Date: | Sat, 25 Sep 1999 01:46:36 CDT
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| To: | djgpp AT delorie DOT com
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| DJ-Gateway: | from newsgroup comp.os.msdos.djgpp
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| Reply-To: | djgpp AT delorie DOT com
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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
===================================
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