rand....

[Shogun]

okey I get how to use rand and srand but my tiny problem is that I cant seme to find any good seed for it I´ve pritty much figurd out that I should use the second on the clock since that is what I use when I use basic but the time comand or the tm_sec doesnt seme to work the way I whant them to....sure I get differnt numbers then I usaly do but they still arn´t randome so what seed should I use ?

[Brighteyes]

Most people go with this

#include <stdlib.h>
#include <time.h>

srand((unsigned)time(NULL));

That easily sets the seed for the current time. time returns a time_t value, and srand takes an unsigned int, so I like to cast to make sure everything's kosher.

[Vber]

srand(time(NULL));

[Hammer]

Shogun: Maybe you should read the FAQ

[Shogun]

I took a look at the faq now and found alot of nice stuff

[dune911]

You may also try this code:

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

/***************************************************
* function to generate numbers between 1 and "max" *
***************************************************/
int my_gen(int max)
{
   return 1+rand()%(max);
}


int main(void)
{
   int number; 

   srand( time(NULL) ); /* activate randomizer */ 

   number = my_gen(20);
   printf(" Random number between 1 and 20: %i",number); 

   return 0;
}

[Shogun]

why doesnt this code work?

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

int main (){
int i;
srand (time (NULL));
i=rand();
printf("%d",i);
return 0;
}

and yes I have read some manuals be4 coming asking this question.
I get missing "(" when I compile it

[Shogun]

I tryed to make a new program rewriting the exact same code and it worked and it was the exact code since I compared them letter by letter. :confussed:

[Shogun]

ah okey I see but the thing is the comp I write C on doesn´t have any internet so I dont compy past from web pages or I can but it would be much work putting it on a disk and so so I simply just write the code myself and that still happend :still confussed: