/* nag_bessel_zeros (s17alc) Example Program.
 *
 * Copyright 2000 Numerical Algorithms Group.
 *
 * NAG C Library
 *
 * Mark 6, 2000.
 * Mark 7, revised, 2001.
 *
 */

#include <stdio.h>
#include <math.h>
#include <nag.h>
#include <nag_stdlib.h>
#include <nags.h>
#include <nagx02.h>

int main(void)
{

#define NMAX 100

  double a, rel;
  double *x=0;
  Integer i;
  Integer exit_status=0;
  Integer mode;
  Integer n;
  NagError fail;

  INIT_FAIL(fail);

  /* Skip heading in data file */
  Vscanf("%*[^\n]");
  Vprintf("s17alc Example Program Results\n\n");

  if (! (x = NAG_ALLOC(NMAX, double)))
    {
      Vprintf("Allocation failure\n");
      exit_status=-1;
    }
  rel = sqrt (X02AJC);
  Vscanf("%lf %ld %ld", &a, &n, &mode);
  s17alc(a, n, mode, rel, x, &fail);

  if (fail.code == NE_NOERROR)
    {
      Vprintf("   a   n   mode\n");
      Vprintf(" %4.1f%3ld%6ld\n\n", a, n, mode);
      if (mode == 1)
        Vprintf("Leading n positive zeros of J\n");
      else if (mode == 2)
        Vprintf("Leading n positive zeros of Y\n");
      else if (mode == 3)
        {
          if (a == 0.0)
            Vprintf("Leading n non-negative zeros of J'\n");
          else
            Vprintf("Leading n positive zeros of J'\n");
        }
      else if (mode == 4)
        Vprintf("Leading n positive zeros of Y'\n\n");
      for (i = 0; i <= n-1; ++i)
        Vprintf("  x = %12.4e\n", x[i]);
      Vprintf("\n");
    }
   else
    {
      Vprintf("Error from s17alc.\n%s\n", fail.message);
      exit_status = 1;
      goto END;
    }
 END:
  if (x) NAG_FREE (x);
  return exit_status;
}