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RAND(3) Library Functions Manual RAND(3) NAME rand, srand, rand_r - bad random number generator LIBRARY Standard C Library (libc, -lc) SYNOPSIS #include <stdlib.h> void srand(unsigned int seed); int rand(void); int rand_r(unsigned int *seed); DESCRIPTION These interfaces are obsoleted by random(3). 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. SEE ALSO random(3), rnd(4) STANDARDS The 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"). NetBSD 8.0 June 4, 1993 NetBSD 8.0