/* nag_prob_landau (g01etc) Example Program.
 *
 * Copyright 2002 Numerical Algorithms Group.
 *
 * Mark 7, 2002.
 */

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

int main(int argc, char *argv[])
{
  FILE    *fpin, *fpout;
  /* Scalars */
  double  x, y;
  Integer exit_status = 0;

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

  fprintf(fpout, " nag_prob_landau (g01etc) Example Program Results\n");

  /* Skip heading in data file */
  fscanf(fpin, "%*[^\n] ");

  fscanf(fpin, "%lf%*[^\n] ", &x);

  /* nag_prob_landau (g01etc).
   * Landau distribution function Phi(lambda~)
   */
  y = nag_prob_landau(x);

  fprintf(fpout, "\n   X          Y\n\n");
  fprintf(fpout, "  %3.1f   %13.4e\n", x, y);

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