/* nag_gamma_dist (g01efc) Example Program.
 *
 * Copyright 1990 Numerical Algorithms Group.
 *
 * Mark 1, 1990.
 */

#include <nag.h>
#include <nagx04.h>
#include <stdio.h>
#include <nag_stdlib.h>
#include <nagg01.h>

int main(int argc, char *argv[])
{
  FILE     *fpin, *fpout;
  Integer  exit_status = 0;
  double   a, b, g, p;
  NagError fail;

  INIT_FAIL(fail);

  /* Check for command-line IO options */
  fpin = nag_example_file_io(argc, argv, "-data", NULL);
  fpout = nag_example_file_io(argc, argv, "-results", NULL);

  /* Skip heading in data file */
  fscanf(fpin, "%*[^\n]");
  fprintf(fpout, "nag_gamma_dist (g01efc) Example Program Results\n");
  fprintf(fpout, " Gamma deviate    Alpha     Beta    Lower tail prob.\n\n");
  while (fscanf(fpin, "%lf %lf %lf", &g, &a, &b) != EOF)
    {
      /* nag_gamma_dist (g01efc).
       * Probabilities for the gamma distribution
       */
      p = nag_gamma_dist(Nag_LowerTail, g, a, b, &fail);
      if (fail.code != NE_NOERROR)
        {
          fprintf(fpout, "Error from nag_gamma_dist (g01efc).\n%s\n",
                  fail.message);
          exit_status = 1;
          goto END;
        }
      fprintf(fpout, " %9.2f%13.2f%9.2f%14.4f\n", g, a, b, p);
    }

 END:
  if (fpin != stdin) fclose(fpin);
  if (fpout != stdout) fclose(fpout);
  return exit_status;
}