02-24-2016
As an addendum to RudiC's reply remember to allow for any duplicate numbers in generating the array _randomly_.
Once you have the array then randomly select your 6 numbers from the array of 30 numbers, again checking for possible duplicates...
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LEARN ABOUT DEBIAN
memshuffle
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)