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

#*****************************************************************************80
#
## S_DIGITS_COUNT counts the digits in a string.
#
#  Discussion:
#
#    The string may include spaces, letters, and dashes, but only the
#    digits 0 through 9 will be counted.
#
#  Example:
#
#    S  => 34E94-70.6
#    N <=  7
#
#  Licensing:
#
#    This code is distributed under the GNU LGPL license. 
#
#  Modified:
#
#    09 September 2015
#
#  Author:
#
#    John Burkardt
#
#  Parameters:
#
#    Input, string S, the string.
#
#    Output, integer N, the number of digits.
#
  from ch_is_digit import ch_is_digit

  s_len = len ( s )

  s_pos = 0
  n = 0

  while ( s_pos < s_len ):

    c = s[s_pos]
    s_pos = s_pos + 1

    if ( ch_is_digit ( c ) ):
      n = n + 1

  return n

def s_digits_count_test ( ):

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

  print ( '' )
  print ( 'S_DIGITS_COUNT_TEST' )
  print ( '  Python version: %s' % ( platform.python_version ( ) ) )
  print ( '  S_DIGITS_COUNT counts the digits in a string.' )
  print ( '' )

  s = '34E94-70.6'
  n = s_digits_count ( s )
  print ( '  We count %d digits in "%s"' % ( n, s ) )

  s = 'Not a one!'
  n = s_digits_count ( s )
  print ( '  We count %d digits in "%s"' % ( n, s ) )

  s = '#8*k >>>> & SEVEN-0.3'
  n = s_digits_count ( s )
  print ( '  We count %d digits in "%s"' % ( n, s ) )
#
#  Terminate.
#
  print ( '' )
  print ( 'S_DIGITS_COUNT_TEST' )
  print ( '  Normal end of execution.' )
  return

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