Question

贝娄是我为ruby-kickstart课程创建课程的第一个（而且相当愚蠢的尝试）。

在我的新意儿中，这应该有效 - 但我得到了：

rubytest.rb:28:in `<main>': uninitialized constant BeerSong (NameError)

rb：28是＆＃34; def print_song＆＃34;

Class BeerSong  
attr_accessor :beers

def initialize(beers)
 beers = 0  if beers < 0
 beers = 99 if beers > 99
 self.beers = beers
end


def print_song
        bottlecount = :beers

        letters_to_numbers = Hash.new 
        letters_to_numbers = {
                    "Ninety" => 90,
                    "Eighty" => 80,
                    "Seventy" => 70,
                    "Sixty" => 60,
                    "Fifty" => 50,
                    "Fourty" => 40,
                    "Thirty" => 30,
                    "Twenty" => 20,
                    "Nineteen" => 19,
                    "Eightteen" => 18,
                    "Seventeen" => 17,
                    "Sixteen" => 16,
                    "Fifteen" => 15,
                    "Fourteen" => 14,
                    "Thirteen" => 13,
                    "Twelve" => 12,
                    "Eleven" => 11,
                    "Ten" => 10,
                    "nine" => 9,
                    "eight" => 8,
                    "seven" => 7,
                    "six" => 6,
                    "five" => 5,
                    "four" => 4,
                    "three" => 3,
                    "two" => 2,
                    "one" => 1
        }

                    while bottlecount > 1
                            bottlecount_primerA = bottlecount.to_s
                            bottlecount_primerB = bottlecount_primerA[0].to_i*10
                            bottlecount_primerC = bottlecount_primerA[1].to_i

                                if bottlecount > 19 && bottlecount_primerC != 0
                                        bottlecount_tens = letters_to_numbers.key(bottlecount_primerB)
                                        bottlecount_singels = letters_to_numbers.key(bottlecount_primerC)
                                        bottlecount_text = "#{bottlecount_tens}-#{bottlecount_singels}"
                                    elsif bottlecount > 19 && bottlecount_primerC == 0
                                        bottlecount_tens = letters_to_numbers.key(bottlecount_primerB)
                                        bottlecount_text = "#{bottlecount_tens}"
                                    elsif bottlecount > 9 && bottlecount < 20 
                                        bottlecount_text = letters_to_numbers.key(bottlecount)
                                end

                            puts "#{bottlecount_text} bottles of beer on the wall,"
                            puts "#{bottlecount_text} bottles of beer,"
                            puts "Take one down, pass it around,"       
                            bottlecount -= 1
                    end
                    puts "one bottle of beer on the wall,"
                    puts "one bottle of beer,"
                    puts "Take one down, pass it around,"   
                    puts "zero bottles of beer on the wall"
end

Bottleman = BeerSong.new (99)

Bottleman.print_song

一直在挠头，但不知道为什么班级不想去。

Answer 1

class BeerSong不仅错误地输入Class BeerSong，而且end语句未正确终止该类。所以Ruby试图找到BeerSong的定义，而不是理解你正试图定义它。如果找不到它，它将返回未初始化的常量错误。

这种错误使得Rubyists对正确的缩进有所了解，因此很容易看到缺少end语句之类的内容。

这面墙上有几瓶啤酒？

1 个答案: