#! /usr/bin/env python
#
def bank_check_digit_calculate ( s ):

#*****************************************************************************80
#
## BANK_CHECK_DIGIT_CALCULATE returns the check digit of a bank checksum.
#
#  Licensing:
#
#    This code is distributed under the GNU LGPL license.
#
#  Modified:
#
#    07 October 2015
#
#  Author:
#
#    John Burkardt
#
#  Parameters:
#
#    Input, string S, a string containing at least 8 digits.
#    Dashes and other characters will be ignored.  A 9th digit may be
#    included, but it will be ignored.
#
#    Output, integer D, the check digit.
#
  from s_to_digits import s_to_digits

  n = 8
  dvec = s_to_digits ( s, n )

  d = 3 * ( dvec[0] + dvec[3] + dvec[6] ) \
    + 7 * ( dvec[1] + dvec[4] + dvec[7] ) \
    +       dvec[2] + dvec[5]

  d = ( d % 10 )

  d = ( ( 10 - d ) % 10 )

  return d

def bank_check_digit_calculate_test ( ):

#*****************************************************************************80
#
## BANK_CHECK_DIGIT_CALCULATE_TEST tests BANK_CHECK_DIGIT_CALCULATE.
#
#  Licensing:
#
#    This code is distributed under the GNU LGPL license.
#
#  Modified:
#
#    07 October 2015
#
#  Author:
#
#    John Burkardt
#
  import platform

  print ( '' )
  print ( 'BANK_CHECK_DIGIT_CALCULATE_TEST' )
  print ( '  Python version: %s' % ( platform.python_version ( ) ) )
  print ( '  BANK_CHECK_DIGIT_CALCULATE calculates the 9-th digit' )
  print ( '  (the check digit) of a bank checksum.' )
  print ( '' )
#
#  Supply the full code, with dashes.
#
  s1 = '123-456-780'
  d1 = 0
  d2 = bank_check_digit_calculate ( s1 )
  print ( '  Check digit of "%s" is %d, expecting %d' % ( s1, d2, d1 ) )
#
#  Supply a partial code, with spaces.
#
  s1 = '123 456 78'
  d1 = 0
  d2 = bank_check_digit_calculate ( s1 )
  print ( '  Check digit of "%s" is %d, expecting %d' % ( s1, d2, d1 ) )
#
#  Supply a partial code, no spaces.
#
  s1 = '323-371-076'
  d1 = 6
  d2 = bank_check_digit_calculate ( s1 )
  print ( '  Check digit of "%s" is %d, expecting %d' % ( s1, d2, d1 ) )
#
#  Supply a partial code, no spaces.
#
  s1 = '87654321'
  d1 = 2
  d2 = bank_check_digit_calculate ( s1 )
  print ( '  Check digit of "%s" is %d, expecting %d' % ( s1, d2, d1 ) )
#
#  Supply a partial code, no spaces.
#
  s1 = '13579864'
  d1 = 3
  d2 = bank_check_digit_calculate ( s1 )
  print ( '  Check digit of "%s" is %d, expecting %d' % ( s1, d2, d1 ) )
#
#  Terminate.
#
  print ( '' )
  print ( 'BANK_CHECK_DIGIT_CALCULATE_TEST' )
  print ( '  Normal end of execution.' )
  return

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