/* nag_stat_inv_cdf_students_t (g01fbc) Example Program.
 *
 * Copyright 2021 Numerical Algorithms Group.
 *
 * Mark 27.2, 2021.
 *
 */

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

int main(void) {
  Integer exit_status = 0;
  double df, p, t;
  int i;
  static Nag_TailProbability tail[] = {Nag_LowerTail, Nag_UpperTail,
                                       Nag_TwoTailSignif, Nag_TwoTailConfid};
  static const char *tailmess[] = {"Nag_LowerTail", "Nag_UpperTail",
                                   "Nag_TwoTailSignif", "Nag_TwoTailConfid"};
  NagError fail;

  INIT_FAIL(fail);

  printf("nag_stat_inv_cdf_students_t (g01fbc) Example Program Results\n\n");
  /* Skip heading in data file */
  scanf("%*[^\n]");
  printf("    p      df          tail                  t\n\n");
  while (scanf("%lf %lf %d", &p, &df, &i) != EOF)
  {
    /* nag_stat_inv_cdf_students_t (g01fbc).
     * Deviates for Student's t-distribution
     */
    t = nag_stat_inv_cdf_students_t(tail[i], p, df, &fail);
    if (fail.code != NE_NOERROR) {
      printf("Error from nag_stat_inv_cdf_students_t (g01fbc).\n%s\n",
             fail.message);
      exit_status = 1;
      goto END;
    }
    printf("%8.3f%8.3f   %-19s  %8.3f\n", p, df, tailmess[i], t);
  }

END:
  return exit_status;
}