In Listing 2, notice the many sets of lowercase and uppercase characters.
要注意清单2中很多成对的小写和大写字符。
These markers could have any name and may not be in all uppercase characters.
这些标志可以是任何名称，可以不是全大写的。
The test links to two functions that print the message again: the first time in all uppercase characters and then again in lowercase characters.
该测试程序链接到再次打印该消息的两个函数上：第一次都用大写字符，第二次都用小写字符。
Palindromes should be reported all in uppercase characters.
全部用大写字母来输出回文。
Palindromes should be reported all in uppercase characters.
全部用大写字母来输出回文。
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