MEMSHUFFLE(3pub)					       C Programmer's Manual						  MEMSHUFFLE(3pub)

NAME

       memshuffle - make an array be in random order

SYNOPSIS

       #include <publib.h>
       void *memshuffle(void *block, size_t elsize, size_t elnum);

DESCRIPTION

       memshuffle will move around the elements of an array in a random fashion.  It uses the standard library function rand(3) to get the pseudo-
       random numbers it needs.  The caller must set a suitable seed with srand(3).

RETURN VALUE

       memshuffle returns its first argument.

EXAMPLE

       To shuffle an integer array one might do the following.

	    int array[4] = { 1, 2, 3, 4 };

	    memshuffle(array, sizeof(array[0]), 4);

BUGS

       On many systems rand(3) is not of very good quality.  However, it is the only random number generator that can be assumed to exist.  Making
       it possible for the caller to provide an alternate source of random numbers (e.g., via a function pointer) is perhaps too more trouble than
       its worth.  A better way would be for everyone to fix their rand's.

SEE ALSO

       publib(3), memrev(3), rand(3), srand(3)

AUTHOR

       Lars Wirzenius (lars.wirzenius@helsinki.fi)

Publib							       C Programmer's Manual						  MEMSHUFFLE(3pub)