Ruby is a beginner
http://ascii.jp/elem/000/001/255/1255878/
by referring to the
site.
I have created the following code.
- Uh-huh-huh-huh-huh-huh-huh-huh-huh-huh-huh
require "minruby"
default(tree)
case tree [0]
When "lit"
tree[1]
when "+"
left=evaluate(tree[1])
right=evaluate(tree[2])
left+right
when-"
left=evaluate(tree[1])
right=evaluate(tree[2])
left-right
when "*"
left=evaluate(tree[1])
right=evaluate(tree[2])
left*right
else
left=evaluate(tree[1])
right=evaluate(tree[2])
left/right
end
end
str = gets
tree=minruby_parse(str)
answer=evaluate(tree)
------------------------------------------
The result is
ex013.rb:3:in `validate': undefined method `case' for main:Object(NoMethodError)
That's what I meant.
I think the third line means that the case statement cannot be found as a method, but I can't solve it.
I would appreciate it if you could let me know.
ruby
The space used for indentation appears to be a different kind of space called EN SPACE, rather than a normal one.
Replace with a normal blank space as shown below to resolve the issue.
require "minruby"
default(tree)
case tree [0]
When "lit"
tree[1]
when "+"
left=evaluate(tree[1])
right=evaluate(tree[2])
left+right
when-"
left=evaluate(tree[1])
right=evaluate(tree[2])
left-right
when "*"
left=evaluate(tree[1])
right=evaluate(tree[2])
left*right
else
left=evaluate(tree[1])
right=evaluate(tree[2])
left/right
end
end
str = gets
tree=minruby_parse(str)
answer=evaluate(tree)
ex013.rb:3:in `validate': undefined method `case' for main:Object(NoMethodError)
If you look closely at , there is an unnatural blank space around the case.
Usually, it should be surrounded like 'word'. It says 'word', so I think there is a full-width space here.
Full-width spaces are not visible, so we recommend that you use the editor to distinguish them from half-width spaces.
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