/* nag_real_jacobian_elliptic (s21cac) Example Program.
 *
 * Copyright 2002 Numerical Algorithms Group.
 *
 * Mark 7, 2002.
 */

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

int main(int argc, char *argv[])
{
  FILE     *fpin, *fpout;
  Integer  exit_status = 0;
  double   u, m, sn, cn, dn;
  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_real_jacobian_elliptic (s21cac) Example Program Results\n");
  fprintf(fpout,
          "      u            m            sn           cn           dn\n");
  while (fscanf(fpin, "%lf %lf", &u, &m) != EOF)
    {
      /* nag_real_jacobian_elliptic (s21cac).
       * Jacobian elliptic functions sn, cn and dn of real
       * argument
       */
      nag_real_jacobian_elliptic(u, m, &sn, &cn, &dn, &fail);
      if (fail.code != NE_NOERROR)
        {
          fprintf(fpout,
                  "Error from nag_real_jacobian_elliptic (s21cac).\n%s\n",
                  fail.message);
          exit_status = 1;
          goto END;
        }
      fprintf(fpout, "%12.3e %12.3e %12.3e %12.3e %12.3e\n", u, m, sn, cn, dn);
    }

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