/* nag_stat_inv_cdf_landau (g01ftc) Example Program.
 *
 * Copyright 2023 Numerical Algorithms Group.
 *
 * Mark 29.2, 2023.
 */

#include <nag.h>
#include <stdio.h>

int main(void) {
  /* Scalars */
  double x, y;
  Integer exit_status;
  NagError fail;

  INIT_FAIL(fail);

  exit_status = 0;

  printf(" nag_stat_inv_cdf_landau (g01ftc) Example Program Results\n");

  /* Skip heading in data file */
  scanf("%*[^\n] ");
  scanf("%lf%*[^\n] ", &x);

  /* nag_stat_inv_cdf_landau (g01ftc).
   * Landau inverse function Psi(x)
   */
  y = nag_stat_inv_cdf_landau(x, &fail);

  if (fail.code == NE_NOERROR) {
    printf("\n   X          Y\n\n");
    printf("  %3.1f   %13.4e\n", x, y);
  } else {
    printf("Error from nag_stat_inv_cdf_landau (g01ftc).\n%s\n", fail.message);
    exit_status = 1;
    goto END;
  }
END:
  return exit_status;
}