回复 1# 的帖子
>ruby test.rb
I still need to visit the following cities:
London
Paris
Amsterdam
>Exit code: 0
>ruby test.rb
test.rb:1: undefined local variable or method `math' for main:Object (NameError)
>Exit code: 1
>ruby test.rb
>Exit code: 0
>ruby test.rb
3.0>Exit code: 0
>ruby test.rb
test.rb:4: undefined local variable or method `h' for main:Object (NameError)
>Exit code: 1
>ruby test.rb
hello world!
>Exit code: 0
>ruby test.rb
>Exit code: 0
>ruby test.rb
hello!
hello!
hello!
>Exit code: 0
