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

# include "sncndn.h"

int main ( );
void jacobi_cn_test ( );
void jacobi_dn_test ( );
void jacobi_sn_test ( );
void timestamp ( );

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

int main ( )

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

    sncndn_test() tests sncndn().

  Licensing:

    This code is distributed under the MIT license.

  Modified:

    26 June 2025

  Author:

    John Burkardt
*/
{
  timestamp ( );
  printf ( "\n" );
  printf ( "sncndn_test():\n" );
  printf ( "  C version\n" );
  printf ( "  Test sncndn(), to evaluate Jacobi elliptic functions.\n" );

  jacobi_cn_test ( );
  jacobi_dn_test ( );
  jacobi_sn_test ( );
/*
  Terminate.
*/
  printf ( "\n" );
  printf ( "sncndn_test():\n" );
  printf ( "  Normal end of execution.\n" );
  timestamp ( );

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

void jacobi_cn_test ( )

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

    jacobi_cn_test() tests jacobi_cn().

  Licensing:

    This code is distributed under the MIT license.

  Modified:

    26 June 2025

  Author:

    John Burkardt
*/
{
  double a;
  double k;
  double cn1;
  double cn2;
  double m;
  int n_data;
  double u;

  printf ( "\n" );
  printf ( "jacobi_cn_test():\n" );
  printf ( "  jacobi_cn() evaluates the Jacobi elliptic function CN.\n" );
  printf ( "\n" );
  printf ( "    U       M       Exact CN                CN(U,M)\n" );
  printf ( "\n" );

  n_data = 0;

  while ( true )
  {
    jacobi_cn_values ( &n_data, &u, &a, &k, &m, &cn1 );

    if ( n_data == 0 )
    {
      break;
    }

    cn2 = jacobi_cn ( u, m );

    printf ( "%8.4f  %8.4f  %24.16g  %24.16g\n", u, m, cn1, cn2 );
  }

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

void jacobi_dn_test ( )

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

    jacobi_dn_test() tests jacobi_dn().

  Licensing:

    This code is distributed under the MIT license.

  Modified:

    26 June 2025

  Author:

    John Burkardt
*/
{
  double a;
  double k;
  double dn1;
  double dn2;
  double m;
  int n_data;
  double u;

  printf ( "\n" );
  printf ( "jacobi_dn_test():\n" );
  printf ( "  jacobi_dn() evaluates the Jacobi elliptic function DN.\n" );
  printf ( "\n" );
  printf ( "    U       M       Exact DN                DN(U,M)\n" );
  printf ( "\n" );

  n_data = 0;

  while ( true )
  {
    jacobi_dn_values ( &n_data, &u, &a, &k, &m, &dn1 );

    if ( n_data == 0 )
    {
      break;
    }

    dn2 = jacobi_dn ( u, m );

    printf ( "%8.4f  %8.4f  %24.16g  %24.16g\n", u, m, dn1, dn2 );

  }

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

void jacobi_sn_test ( )

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

    jacobi_sn_test() tests jacobi_sn().

  Licensing:

    This code is distributed under the MIT license.

  Modified:

    26 June 2025

  Author:

    John Burkardt
*/
{
  double a;
  double k;
  double m;
  int n_data;
  double sn1;
  double sn2;
  double u;

  printf ( "\n" );
  printf ( "jacobi_sn_test():\n" );
  printf ( "  jacobi_sn() evaluates the Jacobi elliptic function SN.\n" );
  printf ( "\n" );
  printf ( "    U       M       Exact SN                SN(U,M)\n" );
  printf ( "\n" );

  n_data = 0;

  while ( true )
  {
    jacobi_sn_values ( &n_data, &u, &a, &k, &m, &sn1 );

    if ( n_data == 0 )
    {
      break;
    }

    sn2 = jacobi_sn ( u, m );

    printf ( "%8.4f  %8.4f  %24.16g  %24.16g\n", u, m, sn1, sn2 );
  }

  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
}