class Integer < Value

  int as_char()
    if_plus( self - 9)
      return 32
    else
      return 48 + self
    end
  end

  Word as_string(Word str)
    if_minus( self - 10 )
      int num = as_char()
      str = str.push_char( num )
    else
      int rest = self.div10()
      str = rest.as_string( str )
      rest = rest * 10
      rest = self - rest
      str = rest.as_string(str)
    end
    return str
  end

  Word to_s()
    Word start = " "
    return as_string( start )
  end

  int puti()
    Word str = self.to_s()
    str.putstring()
    return self
  end

  int mod4()
    return self & 3
  end
end