# include <stdio.h>
# include <stdlib.h>
# include <time.h>

# include "besselzero.h"

int main ( );
void besselzero_j_print ( );
void besselzero_y_print ( );
void timestamp ( );

/******************************************************************************/

int main ( )

/******************************************************************************/
/*
  Purpose:

    besselzero_test() tests besselzero().

  Licensing:

    This code is distributed under the MIT license.

  Modified:

    08 June 2025

  Author:

    John Burkardt
*/
{
  timestamp ( );

  printf ( "\n" );
  printf ( "besselzero_test():\n" );
  printf ( "  C version\n" );
  printf ( "  Test besselzero()\n" );

  besselzero_j_print ( );
  besselzero_y_print ( );
/*
  Terminate.
*/
  printf ( "\n" );
  printf ( "besselzero_test():\n" );
  printf ( "  Normal end of execution.\n" );
  timestamp ( );

  return 0;
}
/******************************************************************************/

void besselzero_j_print ( )

/******************************************************************************/
/*
  Purpose:

    besselzero_j_print() tests jn_zeros() for the Bessel J function.

  Licensing:

    This code is distributed under the MIT license.

  Modified:

    08 June 2025

  Author:

    John Burkardt
*/
{
  int i;
  int n;
  int nt;
  double *z0;
  double *z1;

  printf ( "\n" );
  printf ( "besselzero_j_print():\n" );
  printf ( "  Print zeros of Bessel j function.\n" );

  nt = 10;
  z0 = ( double * ) malloc ( nt * sizeof ( double ) );
  z1 = ( double * ) malloc ( nt * sizeof ( double ) );

  n = 0;
  jn_zeros ( n, nt, z0 );

  n = 1;
  jn_zeros ( n, nt, z1 );

  printf ( "\n" );
  printf ( "    i    J0(root i)  J1(root i)\n" );
  printf ( "\n" );
  for ( i = 0; i < nt; i++ )
  {
    printf ( "  %2d  %14.6g  %14.6g\n", i, z0[i], z1[i] );
  }

  free ( z0 );
  free ( z1 );

  return;
}
/******************************************************************************/

void besselzero_y_print ( )

/******************************************************************************/
/*
  Purpose:

    besselzero_y_print() tests besselzero() for the Bessel Y function.

  Licensing:

    This code is distributed under the MIT license.

  Modified:

    08 June 2025

  Author:

    John Burkardt
*/
{
  int i;
  int n;
  int nt;
  double *z0;
  double *z1;

  printf ( "\n" );
  printf ( "besselzero_y_print():\n" );
  printf ( "  Print zeros of Bessel y function.\n" );

  nt = 10;
  z0 = ( double * ) malloc ( nt * sizeof ( double ) );
  z1 = ( double * ) malloc ( nt * sizeof ( double ) );

  n = 0;
  yn_zeros ( n, nt, z0 );

  n = 1;
  yn_zeros ( n, nt, z1 );

  printf ( "\n" );
  printf ( "    i    Y0(root i)  Y1(root i)\n" );
  printf ( "\n" );
  for ( i = 0; i < nt; i++ )
  {
    printf ( "  %2d  %14.6g  %14.6g\n", i, z0[i], z1[i] );
  }

  free ( z0 );
  free ( z1 );

  return;
}
/******************************************************************************/

void timestamp ( )

/******************************************************************************/
/*
  Purpose:
 
    timestamp() prints the current YMDHMS date as a time stamp.

  Example:

    17 June 2014 09:45:54 AM

  Licensing:

    This code is distributed under the MIT license. 

  Modified:

    01 May 2021

  Author:

    John Burkardt
*/
{
# define TIME_SIZE 40

  static char time_buffer[TIME_SIZE];
  const struct tm *tm;
  time_t now;

  now = time ( NULL );
  tm = localtime ( &now );

  strftime ( time_buffer, TIME_SIZE, "%d %B %Y %I:%M:%S %p", tm );

  printf ( "%s\n", time_buffer );

  return;
# undef TIME_SIZE
}