/* nag_elliptic_integral_pi (s21bgc) Example Program.
 *
 * Copyright 2008, Numerical Algorithms Group.
 *
 * Mark 9, 2009.
 */
/* Pre-processor includes */
#include <stdio.h>
#include <math.h>
#include <nag.h>
#include <nagx04.h>
#include <nag_stdlib.h>
#include <nags.h>
#include <nagx01.h>

int main(int argc, char *argv[])
{
  FILE     *fpout;
  /*Integer scalar and array declarations */
  Integer  exit_status = 0;
  Integer  ix;
  /*Double scalar and array declarations */
  double   dm, dn, p, phi, pi;
  NagError fail;

  INIT_FAIL(fail);

  /* Check for command-line IO options */
  fpout = nag_example_file_io(argc, argv, "-results", NULL);
  fprintf(fpout, "nag_elliptic_integral_pi (s21bgc) Example Program Results\n");
  fprintf(fpout, "\n    dn     phi    dm       nag_elliptic_integral_pi\n\n");
  /*
   * nag_pi (x01aac)
   */
  pi = nag_pi;
  for (ix = 1; ix <= 3; ix++)
    {
      phi = ix*pi/6.00e0;
      dm = ix*0.250e0;
      dn = (pow(((-(1.00e0))), (ix+1)))*ix*0.10e0;
      /*
       * nag_elliptic_integral_pi (s21bgc)
       * Elliptic integral of 3rd kind, Legendre form, Pi (n; phi |m)
       */
      p = nag_elliptic_integral_pi(dn, phi, dm, &fail);
      if (fail.code != NE_NOERROR)
        {
          fprintf(fpout, "Error from nag_elliptic_integral_pi (s21bgc).\n%s\n",
                  fail.message);
          exit_status = 1;
          goto END;
        }
      fprintf(fpout, "%7.2f%7.2f%7.2f%12.4f\n", dn, phi, dm, p);
    }

 END:
  if (fpout != stdout) fclose(fpout);

  return exit_status;
}