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程序里的注释是很重要的。它们可以用自然语言告诉你某段程序代码的功能是什么。在你想要临时移除一段程序代码时,你还可以用注释的方式将这段程序代码临时禁用。接下来的练习将让你学会注释:

# A comment, this is so you can read your program later.
# Anything after the # is ignored by Ruby.

puts "I could have code like this." # and the comment after is ignored

# You can also use a comment to "disable" or comment out a piece of code:
# print "This won't run."

puts "This will run."

你应该看到的结果

$ ruby ex2.rb 
I could have code like this.
This will run.
$

加分练习

  1. 弄清楚#符号的作用。而且记住它的名称。(中文为井号,英文为 octothorpe 或者 pound character)。
  2. 打开你的ex2.rb文件,从后往前逐行检查。从最后一行开始,倒着逐个单词单词检查回去。
  3. 有发现更多错误嘛?有的话就改正过来。
  4. 阅读你写的练习,把每个字符(charcter)都读出来。有没有发现更多的错误呢?有的话也一样改正过来。
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