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Subject: Re: random() : What am I doing wrong?
Date: Tue, 04 Sep 2007 12:08:12 -0700
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On Aug 30, 11:47 pm, "MikeC" <My_addr DOT  DOT  DOT  AT end DOT of DOT post> wrote:
> Folks,
>
> Here's an open invitation to make me feel foolish!
>
> Here's the program :
>
> #include <time.h>
> #include <stdlib.h>
>
> main()
> { long lng;
>
>   lng = rawclock();
>   printf("\nClock = %ld - ", lng);
>   srand(lng);
>   printf("Random numbers = %ld;  %ld;  %ld",random(),random(),random());
>
> }
>
> The idea is to seed the random number generator from the clock, so that the
> first call to random() will always produce a different result.
>
> When I run the program several times, here's what it yields :
>
> Clock = 1392294 - Random numbers = 1027100827;  143302914;  2078917053
> Clock = 1393105 - Random numbers = 1027100827;  143302914;  2078917053
> Clock = 1393314 - Random numbers = 1027100827;  143302914;  2078917053
> Clock = 1393420 - Random numbers = 1027100827;  143302914;  2078917053
> Clock = 1393471 - Random numbers = 1027100827;  143302914;  2078917053
> Clock = 1393512 - Random numbers = 1027100827;  143302914;  2078917053
> Clock = 1393548 - Random numbers = 1027100827;  143302914;  2078917053
>
> The 'random' numbers are the same every time I run the program, yet they are
> being seeded be a clock value that is different each time.  I guess the wood
> is there somewhere, but the trees are getting in the way.
>
> Incidentally, I'm running Windows 2000, SP4.
>
> Advance thanks,
>
> MikeC.
> --
> Mental decryption required to bamboozle spam robots:
>
> mike_best$ntlworld*com
> $ = @
> * = dot

Hi
The problem is that srand() work on rand() and not on random().
You have to take srandom() instead srand() and the program will work
fine.
Moshe