/* nag_prob_students_t (g01ebc) Example Program.
 *
 * Copyright 2017 Numerical Algorithms Group.
 *
 * Mark 26.2, 2017.
 *
 */

#include <nag.h>
#include <stdio.h>
#include <nag_stdlib.h>
#include <nagg01.h>

int main(void)
{
  Integer exit_status = 0;
  double df, prob, t;
  int i;
  static Nag_TailProbability tail[4] = { 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_prob_students_t (g01ebc) Example Program Results\n\n");
  /* Skip heading in data file */
  scanf("%*[^\n]");
  printf("    t      df     prob      tail\n\n");
  while (scanf("%lf %lf %d\n", &t, &df, &i) != EOF)
  {
    /* nag_prob_students_t (g01ebc).
     * Probabilities for Student's t-distribution
     */
    prob = nag_prob_students_t(tail[i], t, df, &fail);
    if (fail.code != NE_NOERROR) {
      printf("Error from nag_prob_students_t (g01ebc).\n%s\n", fail.message);
      exit_status = 1;
      goto END;
    }
    printf(" %6.3f%8.3f%8.4f  %s\n", t, df, prob, tailmess[i]);
  }

END:
  return exit_status;
}