static boolean isDivisibleBy10 ( char bin [ ] , int n ) {
  if ( bin [ n - 1 ] == '1' ) return false ;
  int sum = 0 ;
  for ( int i = n - 2 ;
  i >= 0 ;
  i -- ) {
    if ( bin [ i ] == '1' ) {
      int posFromRight = n - i - 1 ;
      if ( posFromRight % 4 == 1 ) sum = sum + 2 ;
      else if ( posFromRight % 4 == 2 ) sum = sum + 4 ;
      else if ( posFromRight % 4 == 3 ) sum = sum + 8 ;
      else if ( posFromRight % 4 == 0 ) sum = sum + 6 ;
    }
  }
  if ( sum % 10 == 0 ) return true ;
  return false ;
}

static boolean isDivisibleBy10 ( char bin [ ] , int n ) { if ( bin [ n - 1 ] == '1' ) return false ; int sum = 0 ; for ( int i = n - 2 ; i >= 0 ; i -- ) { if ( bin [ i ] == '1' ) { int posFromRight = n - i - 1 ; if ( posFromRight % 4 == 1 ) sum = sum + 2 ; else if ( posFromRight % 4 == 2 ) sum = sum + 4 ; else if ( posFromRight % 4 == 3 ) sum = sum + 8 ; else if ( posFromRight % 4 == 0 ) sum = sum + 6 ; } } if ( sum % 10 == 0 ) return true ; return false ; }
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