random generator code

[Ken Moffat]

Rick Sivernell wrote:

>hi all
>
>   has any one got a good random generator c code that you can set the highes value
>limit. rand just doe not work for what I need. What I am doing is passing in an array
>with it max length, I need to randomly pick a location index and get its value. Any
>ideas would be appreciated
>
>cheers
>
>  
>
This may help you. Not great, but ...




static Sint32 seed = 0;

static void initrandom()
{
    seed = time(NULL);
}

static unsigned int getrandom()
{
    Sint32 p1 = 1103515245;
    Sint32 p2 = 12345;
    seed = (seed*p1+p2) % 2147483647;
    return (unsigned)seed/3;
}


r = getrandom() % MAX; // #define MAX to size of array


-- 
Ken