Question

我正在努力做Ruby（ex9） - ＆gt; http://ruby.learncodethehardway.org/book/ex9.html

为什么找不到常数PARAGRAPH？

错误=＆gt;：

$ ruby ex9.rb
ex9.rb:9: uninitialized constant PARAGRAPH (NameError)

CODE（我的意见）：

# Here's some new strange stuff, remember type it exactly.

days = "Mon Tue Wed Thu Fri Sat Sun"
months = "Jan\n\Feb\nMar\nApr\nMay\nJun\nJul\nAug"

puts = "Here are the days: ", days
puts = "Here are the months: ", months

puts <<PARAGRAPH
Theres something going on here.
With the paragraph thing.
Well be able to type as much as we like.
Even four lines.
PARAGRAPH

注意：我修改了段落中的代码并删除了整数和可能的语句，例如“if or”或“只是为了确保我没有做错其他的事情。使用”正确“的代码我得到以下内容......

课程代码错误=＆gt;：

ex9.rb:12: syntax error, unexpected tIDENTIFIER, expecting $end
We'll be able to type as much as we like.
     ^

课程代码:(我的意见）

# Here's some new strange stuff, remember type it exactly.

days = "Mon Tue Wed Thu Fri Sat Sun"
months = "Jan\n\Feb\nMar\nApr\nMay\nJun\nJul\nAug"

puts = "Here are the days: ", days
puts = "Here are the months: ", months

puts <<PARAGRAPH
There's something going on here.
With the PARAGRAPH thing
We'll be able to type as much as we like.
Even 4 lines if we want, or 5, or 6.
PARAGRAPH

Answer 1

puts = "Here are the days: ", days
puts = "Here are the months: ", months

是你的问题。可能不需要=。

Answer 2

就像有些家伙所说，将"Here are the days: ", days分配给puts是你的问题。当您点击puts <<PARAGRAPH行时，解释程序会尝试将PARAGRAPH附加到数组puts，而不是生成此处的文档，但当然PARAGRAPH未定义。

有点有趣，（虽然不是很有帮助）注意到你实际上仍然可以强制它使用语法

puts(<<PARAGRAPH)
Theres something going on here.
With the paragraph thing.
Well be able to type as much as we like.
Even four lines.
PARAGRAPH

Ruby（HardWay（ex9））＆lt;＆lt;未初始化的常数PARAGRAPH

2 个答案: