private static void add20n ( int [ ] n , int [ ] n2 ) {
  int carry = 0 ;
  int i ;
  for ( i = 0 ;
  i < n . length ;
  i ++ ) {
    int sum = n [ i ] * 2 + n2 [ i + 1 ] + carry ;
    n2 [ i + 1 ] = sum % 10 ;
    carry = sum / 10 ;
  }
  for ( i ++ ;
  carry > 0 ;
  i ++ ) {
    int sum = n2 [ i ] + carry ;
    n2 [ i ] = sum % 10 ;
    carry = sum / 10 ;
  }
}

private static void add20n ( int [ ] n , int [ ] n2 ) { int carry = 0 ; int i ; for ( i = 0 ; i < n . length ; i ++ ) { int sum = n [ i ] * 2 + n2 [ i + 1 ] + carry ; n2 [ i + 1 ] = sum % 10 ; carry = sum / 10 ; } for ( i ++ ; carry > 0 ; i ++ ) { int sum = n2 [ i ] + carry ; n2 [ i ] = sum % 10 ; carry = sum / 10 ; } }
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