```/* nag_nonpar_randtest_gaps (g08edc) Example Program.
*
* Copyright 2019 Numerical Algorithms Group.
*
* Mark 27.0, 2019.
*
*
*/

#include <stdio.h>
#include <nag.h>

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

/* NAG structures */
NagError fail;

/* Double scalar and array declarations */
double chi, df, length, lower, p, upper, *x = 0;

/* Choose the base generator */
Nag_BaseRNG genid = Nag_Basic;
Integer subid = 0;

/* Set the seed */
Integer seed[] = { 424232 };
Integer lseed = 1;

/* Set the size of the (randomly generated) dataset */
Integer n = 5000;

/* Set the maximum number of gaps (0 = no limit) */
Integer num_gaps = 0;

/* Set the length of the maximum gap */
Integer max_gap = 10;

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

printf("nag_nonpar_randtest_gaps (g08edc) Example Program Results\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 vector of n uniform variates between 0.0 and 1.0 */
nag_rand_dist_uniform(n, 0.0, 1.0, state, x, &fail);

/* Set the length of interval which contains all possible values.
The data is generated from the range 0.0 to 1.0, so length is 1.0
*/
length = 1.0;

/* Set lower and upper limit for the interval used for the gap test */
lower = 0.4;
upper = 0.6;

/* nag_nonpar_randtest_gaps (g08edc).
* Performs the gaps test for randomness
*/
nag_nonpar_randtest_gaps(n, x, num_gaps, max_gap, lower, upper, length, &chi, &df, &p,
&fail);

/* Display the results */
if (fail.code != NE_NOERROR && fail.code != NE_G08ED_GAPS &&
fail.code != NE_G08ED_FREQ_LT_ONE) {
printf("Error from nag_nonpar_randtest_gaps (g08edc).\n%s\n", fail.message);
exit_status = 1;
goto END;
}
printf("\n");
printf("Chisq = %10.4f\n", chi);
printf("DF    = %7.1f\n", df);
printf("Prob  = %10.4f\n", p);
if (fail.code == NE_G08ED_FREQ_LT_ONE)
printf("Error from nag_nonpar_randtest_gaps (g08edc).\n%s\n", fail.message);

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

return exit_status;
}
```