/* nag_complex_log_gamma (s14agc) 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;
  Complex  y, z;
  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_complex_log_gamma (s14agc) Example Program Results\n");
  fprintf(fpout, "     z                  ln(Gamma(z))\n");
  while (fscanf(fpin, " (%lf,%lf)%*[^\n] ", &z.re, &z.im) != EOF)
    {
      /* nag_complex_log_gamma (s14agc).
       * Logarithm of the Gamma function ln~Gamma~(z)
       */
      y = nag_complex_log_gamma(z, &fail);
      if (fail.code == NE_NOERROR)
        fprintf(fpout, "(%5.1f,%5.1f)   (%13.4e,%13.4e)\n", z.re, z.im, y.re,
                y.im);
      else
        {
          fprintf(fpout, "Error from nag_complex_log_gamma (s14agc).\n%s\n",
                  fail.message);
          exit_status = 1;
          goto END;
        }
    }

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

  return exit_status;
}