NAG Library Manual, Mark 29.2
```/* nag_rand_dist_beta (g05sbc) Example Program.
*
* Copyright 2023 Numerical Algorithms Group.
*
* Mark 29.2, 2023.
*/
/* Pre-processor includes */
#include <math.h>
#include <nag.h>
#include <stdio.h>

int main(void) {
/* Integer scalar and array declarations */
Integer exit_status = 0;
Integer i, lstate;
Integer *state = 0;

/* NAG structures */
NagError fail;

/* Double scalar and array declarations */
double *x = 0;

/* Set the distribution parameters */
double a = 2.0e0;
double b = 2.0e0;

/* Set the sample size */
Integer n = 5;

/* 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_dist_beta (g05sbc) 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(n, double)) || !(state = NAG_ALLOC(lstate, Integer))) {
printf("Allocation failure\n");
exit_status = -1;
goto END;
}

/* Initialize the generator to a repeatable sequence */
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;
}

/* Generate the variates */
nag_rand_dist_beta(n, a, b, state, x, &fail);
if (fail.code != NE_NOERROR) {
printf("Error from nag_rand_dist_beta (g05sbc).\n%s\n", fail.message);
exit_status = 1;
goto END;
}

/* Display the variates */
for (i = 0; i < n; i++)
printf("%10.4f\n", x[i]);

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

return exit_status;
}
```