Demonstrate it's safe to use a PRNG to seed more PRNGs with a GOOD PRNG.

gistfile1.txt

/* See http://www.pcg-random.org/using-pcg-c-basic.html */
#include "pcg_basic.h"
#include <stdio.h>

void try_random(unsigned int seed, int initseq) {
    pcg32_random_t rng;

    pcg32_srandom_r(&rng, seed, initseq);
    printf("Seed: %u\n", seed);
    
    for( int i = 0; i < 5; i++ ) {
        printf("%u ", pcg32_random_r(&rng));
    }
    printf("\n");
}

int main(void) {
    /* Deliberately using a fixed init sequence to remove that as a
       source of entropy for the purpose of this test. Normally use
       something like the pointer to the rng. */
    int initseq = 6;

    /* The initial seed does not matter */
    int master_seed = 5;
    
    pcg32_random_t seed_rng;

    pcg32_srandom_r(&seed_rng, master_seed, initseq);

    for( int i = 0; i < 5; i++ ) {
        unsigned int seed = pcg32_random_r(&seed_rng);
        try_random(seed, initseq);
    }
    
    return 0;
}