#! /usr/bin/env python
#
def i4_to_isbn_digit ( i ):

#*****************************************************************************80
#
## I4_TO_ISBN_DIGIT converts an integer to an ISBN digit.
#
#  Discussion:
#
#    Only the integers 0 through 10 can be input.  The representation
#    of 10 is 'X'.
#
#  Licensing:
#
#    This code is distributed under the GNU LGPL license.
#
#  Modified:
#
#    16 September 2015
#
#  Author:
#
#    John Burkardt
#
#  Parameters:
#
#    Input, integer I, an integer between 0 and 10.
#
#    Output, character VALUE, the ISBN character code of the integer.
#    If I is illegal, then VALUE is set to '?'.
#
  if ( i == 0 ):
    value = '0'
  elif ( i == 1 ):
    value = '1'
  elif ( i == 2 ):
    value = '2'
  elif ( i == 3 ):
    value = '3'
  elif ( i == 4 ):
    value = '4'
  elif ( i == 5 ):
    value = '5'
  elif ( i == 6 ):
    value = '6'
  elif ( i == 7 ):
    value = '7'
  elif ( i == 8 ):
    value = '8'
  elif ( i == 9 ):
    value = '9'
  elif ( i == 10 ):
    value = 'X'
  else:
    value = '?'

  return value

def i4_to_isbn_digit_test ( ):

#*****************************************************************************80
#
## I4_TO_ISBN_DIGIT_TEST tests I4_TO_ISBN_DIGIT.
#
#  Licensing:
#
#    This code is distributed under the GNU LGPL license.
#
#  Modified:
#
#    12 September 2015
#
#  Author:
#
#    John Burkardt
#
  import platform

  print ( '' )
  print ( 'I4_TO_ISBN_DIGIT_TEST' )
  print ( '  Python version: %s' % ( platform.python_version ( ) ) )
  print ( '  I4_TO_ISBN_DIGIT converts digits 0 to 10 to an ISBN digit.' )
  print ( '' )

  for i4 in range ( 0, 11 ):
    c = i4_to_isbn_digit ( i4 )
    print ( '  %8d     "%c"' % ( i4, c ) )
#
#  Terminate.
#
  print ( '' )
  print ( 'I4_TO_ISBN_DIGIT_TEST:' )
  print ( '  Normal end of execution.' )
  return

if ( __name__ == '__main__' ):
  from timestamp import timestamp
  timestamp ( )
  i4_to_isbn_digit_test ( )
  timestamp ( )