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#include <stdio.h>
#include <time.h>
#include <stc/crandom.h>
int main()
{
const size_t N = 1000000000;
const uint64_t seed = (uint64_t)time(NULL), range = 1000000;
stc64_t rng = stc64_new(seed);
int64_t sum;
clock_t diff, before;
printf("Compare speed of full and unbiased ranged random numbers...\n");
sum = 0;
before = clock();
c_forrange (N) {
sum += (uint32_t)stc64_rand(&rng);
}
diff = clock() - before;
printf("full range\t\t: %f secs, %" c_ZI ", avg: %f\n",
(float)diff / CLOCKS_PER_SEC, N, (float)sum / (float)N);
stc64_uniform_t dist1 = stc64_uniform_new(0, range);
rng = stc64_new(seed);
sum = 0;
before = clock();
c_forrange (N) {
sum += stc64_uniform(&rng, &dist1); // unbiased
}
diff = clock() - before;
printf("unbiased 0-%" PRIu64 "\t: %f secs, %" c_ZI ", avg: %f\n",
range, (float)diff/CLOCKS_PER_SEC, N, (float)sum / (float)N);
sum = 0;
rng = stc64_new(seed);
before = clock();
c_forrange (N) {
sum += (int64_t)(stc64_rand(&rng) % (range + 1)); // biased
}
diff = clock() - before;
printf("biased 0-%" PRIu64 " \t: %f secs, %" c_ZI ", avg: %f\n",
range, (float)diff / CLOCKS_PER_SEC, N, (float)sum / (float)N);
}
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