| RAND(3) | Library Functions Manual | RAND(3) | 
rand, srand,
  rand_r —
#include <stdlib.h>
void
  
  srand(unsigned
    int seed);
int
  
  rand(void);
int
  
  rand_r(unsigned
    int *seed);
The rand() function computes a sequence of
    pseudo-random integers in the range of 0 to RAND_MAX
    (as defined by the header file
    <stdlib.h>).
The srand() function sets its argument as
    the seed for a new sequence of pseudo-random numbers to be returned by
    rand(). These sequences are repeatable by calling
    srand() with the same seed value.
If no seed value is provided, the rand()
    function is automatically seeded with a value of 1.
The rand_r() function is a reentrant
    interface to rand(); the seed has to be supplied and
    is maintained by the caller.
rand() and srand() functions
  conform to ANSI X3.159-1989
  (“ANSI C89”). The rand_r()
  function conforms to IEEE Std 1003.1c-1995
  (“POSIX.1c”).
| June 4, 1993 | NetBSD 9.4 |