#! /usr/bin/env python
#
def year_is_leap_gregorian ( y ):

#*****************************************************************************80
#
## YEAR_IS_LEAP_GREGORIAN returns TRUE if the Gregorian year was a leap year.
#
#  Licensing:
#
#    This code is distributed under the GNU LGPL license.
#
#  Modified:
#
#    19 August 2015
#
#  Author:
#
#    John Burkardt
#
#  Parameters:
#
#    Input, integer Y, the year to be checked.
#
#    Output, bool YEAR_IS_LEAP_GREGORIAN, TRUE if the year was a leap year,
#    FALSE otherwise.
#
  from sys import exit

  if ( y <= 0 ):
    print ( '' )
    print ( 'YEAR_IS_LEAP_GREGORIAN - Fatal error!' )
    print ( '  This function will not accept nonpositive years.' )
    exit ( 'YEAR_IS_LEAP_GREGORIAN - Fatal error!' )

  if ( ( y % 400 ) == 0 ):
    value = True
  elif ( ( y % 100 ) == 0 ):
    value = False
  elif ( ( y % 4 ) == 0 ):
    value = True
  else:
    value = False

  return value

def year_is_leap_gregorian_test ( ):

#*****************************************************************************80
#
## YEAR_IS_LEAP_GREGORIAN_TEST tests YEAR_IS_LEAP_GREGORIAN.
#
#  Licensing:
#
#    This code is distributed under the GNU LGPL license.
#
#  Modified:
#
#    19 August 2015
#
#  Author:
#
#    John Burkardt
#
  import platform
  from i4_uniform_ab import i4_uniform_ab

  print ( '' )
  print ( 'YEAR_IS_LEAP_GREGORIAN_TEST' )
  print ( '  Python version: %s' % ( platform.python_version ( ) ) )
  print ( '  Report leap years in the Gregorian calendar.' )
  print ( '' )
  print ( '  Year  Leap?' )
  print ( '' )

  seed = 123456789
  for i in range ( 0, 20 ):
    y, seed = i4_uniform_ab ( 1, 2100, seed )
    is_leap = year_is_leap_gregorian ( y )
    print ( '  %4d  %s' % ( y, is_leap ) )
#
#  Terminate.
#
  print ( '' )
  print ( 'YEAR_IS_LEAP_GREGORIAN_TEST' )
  print ( '  Normal end of execution.' )
  return

if ( __name__ == '__main__' ):
  from timestamp import timestamp
  timestamp ( )
  year_is_leap_gregorian_test ( )
  timestamp ( )