NAG Library Manual, Mark 27.3
```/* nag_rand_init_leapfrog (g05khc) Example Program.
*
* Copyright 2021 Numerical Algorithms Group.
*
* Mark 27.3, 2021.
*/
/* Pre-processor includes */
#include <math.h>
#include <nag.h>
#include <stdio.h>

#define STATE(I, J) state[(J - 1) * lstate + I - 1]

int main(void) {
/* Integer scalar and array declarations */
Integer exit_status = 0;
Integer i, j, lstate;
Integer *state = 0;
/* NAG structures */
NagError fail;
/* Double scalar and array declarations */
double *x = 0;
/* Set the sample size */
Integer nv = 5;
/* Set the number of streams */
Integer n = 3;
/* Choose the base generator */
Nag_BaseRNG genid = Nag_Basic;
Integer subid = 0;
/* Set the seed */
Integer seed[] = {1762543};
Integer lseed = 1;

/* Initialize the error structure */
INIT_FAIL(fail);

printf("nag_rand_init_leapfrog (g05khc) Example Program Results\n\n");

/* Get the length of the state array */
lstate = -1;
nag_rand_init_repeat(genid, subid, seed, lseed, state, &lstate, &fail);
if (fail.code != NE_NOERROR) {
printf("Error from nag_rand_init_repeat (g05kfc).\n%s\n", fail.message);
exit_status = 1;
goto END;
}

/* Allocate arrays */
if (!(x = NAG_ALLOC(nv, double)) ||
!(state = NAG_ALLOC(lstate * n, Integer))) {
printf("Allocation failure\n");
exit_status = -1;
goto END;
}

/* Prepare n streams */
for (i = 1; i <= n; i++) {
/* Initialize the I'th stream to a repeatable sequence, using the same
seed for each stream */
nag_rand_init_repeat(genid, subid, seed, lseed, &STATE(1, i), &lstate,
&fail);
if (fail.code != NE_NOERROR) {
printf("Error from nag_rand_init_repeat (g05kfc).\n%s\n", fail.message);
exit_status = 1;
goto END;
}

/* Prepare the I'th out of N streams */
nag_rand_init_leapfrog(n, i, &STATE(1, i), &fail);
if (fail.code != NE_NOERROR) {
printf("Error from nag_rand_init_leapfrog (g05khc).\n%s\n", fail.message);
exit_status = 1;
goto END;
}
}

/* Loop over each of the n streams */
for (i = 1; i <= n; i++) {
/* Generate nv variates from a univariate distribution */
printf(" Stream %12" NAG_IFMT "\n", i);
nag_rand_dist_uniform01(nv, &STATE(1, i), x, &fail);
if (fail.code != NE_NOERROR) {
printf("Error from nag_rand_dist_uniform01 (g05sac).\n%s\n",
fail.message);
exit_status = 1;
goto END;
}

/* Display the variates */
for (j = 0; j < nv; j++)
printf("%11.4f\n", x[j]);
printf(" \n");
}

END:
NAG_FREE(x);
NAG_FREE(state);

return exit_status;
}
```