/* nag_jacobian_elliptic (s21cbc) Example Program.
 *
 * Copyright 2000 Numerical Algorithms Group.
 *
 * NAG C Library
 *
 * Mark 6, 2000.
 */

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

int main(int argc, char *argv[])
{
  FILE     *fpin, *fpout;
  Complex  cn, dn, sn, z;
  Integer  exit_status = 0;
  NagError fail;
  double   ak2;

  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_jacobian_elliptic (s21cbc) Example Program Results\n");
  while (fscanf(fpin, " (%lf,%lf) %lf%*[^\n] ", &z.re, &z.im, &ak2) != EOF)
    {
      /* nag_jacobian_elliptic (s21cbc).
       * Jacobian elliptic functions sn, cn and dn of complex
       * argument
       */
      nag_jacobian_elliptic(z, ak2, &sn, &cn, &dn, &fail);
      fprintf(fpout, "          z                    ak2\n");
      fprintf(fpout, " (%8.4f,%8.4f)     %10.2f\n\n", z.re, z.im, ak2);
      if (fail.code == NE_NOERROR)
        {
          fprintf(fpout, "         sn                     cn"
                  "                     dn\n");
          fprintf(fpout, " (%8.4f,%8.4f)    ", sn.re, sn.im);
          fprintf(fpout, "(%8.4f,%8.4f)    ", cn.re, cn.im);
          fprintf(fpout, "(%8.4f,%8.4f)", dn.re, dn.im);
          fprintf(fpout, "\n");
        }
      else
        {
          fprintf(fpout, "Error from nag_jacobian_elliptic (s21cbc).\n%s\n",
                  fail.message);
          exit_status = 1;
          goto END;
        }
    }
 END:
  if (fpin != stdin) fclose(fpin);
  if (fpout != stdout) fclose(fpout);
  return exit_status;
}