/* nag_bessel_k_alpha_scaled (s18ehc) Example Program.
 *
 * Copyright 2000 Numerical Algorithms Group.
 *
 * NAG C Library
 *
 * Mark 6, 2000.
 */

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


int main(void)
{
  double alpha;
  double b[101];
  double x;
  Integer i;
  Integer ia;
  Integer exit_status=0;
  Integer ja;
  Integer nl;

  NagError fail;

  INIT_FAIL(fail);

  /* Skip heading in data file */
  Vscanf("%*[^\n]");
  Vprintf("s18ehc Example Program Results\n");
  while (scanf("%lf %ld %ld %ld%*[^\n]", &x, &ia, &ja, &nl) != EOF)
    {
      Vprintf("  x     ia    ja    nl\n");
      Vprintf("%4.1f%6ld%6ld%6ld\n\n", x, ia, ja, nl);
      s18ehc(x, ia, ja, nl, b, &fail);
      if (fail.code == NE_NOERROR)
        {
          Vprintf(" Requested values of exp(x)*K_alpha(x)\n\n");
          alpha = (double) ia / (double) ja;
          Vprintf("     alpha      exp(x)*K_alpha(x)\n");
          for (i = 0; i <= nl; ++i)
            {
              Vprintf(" %12.4e      %12.4e\n", alpha, b[i]);
              alpha += 1.0;
            }
        }
      else
        {
          Vprintf("Error from s18ehc.\n%s\n", fail.message);
          exit_status = 1;
          goto END;
        }
    }
 END:
  return exit_status;
}