/* nag_specfun_polygamma (s14acc) Example Program.
 *
 * Copyright 2024 Numerical Algorithms Group.
 *
 * Mark 30.2, 2024.
 */

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

int main(void) {
  Integer exit_status = 0;
  double f, x;
  NagError fail;

  INIT_FAIL(fail);

  /* Skip heading in data file */
  scanf("%*[^\n]");
  printf("nag_specfun_polygamma (s14acc) Example Program Results\n");
  printf("     x       psi(x)-log(x)\n");
  while (scanf("%lf", &x) != EOF)
  {
    /* nag_specfun_polygamma (s14acc).
     * psi(x) - ln(x)
     */
    f = nag_specfun_polygamma(x, &fail);
    if (fail.code != NE_NOERROR) {
      printf("Error from nag_specfun_polygamma (s14acc).\n%s\n", fail.message);
      exit_status = 1;
      goto END;
    }
    printf("%8.3f %14.4f\n", x, f);
  }

END:
  return exit_status;
}