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MEMSHUFFLE(3) C Programmer's Manual MEMSHUFFLE(3) 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 fash- ion. 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(3)
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | EXAMPLE | BUGS | SEE ALSO | AUTHOR
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