debug support system statement format 除错支持系统叙述格式
Note that this is a little more advanced than a typical HelloWorld application that prints the statement without user interaction, but the message is printed to debug.
注意，这比只打印出hello world句子而没有用户交互的典型HelloWorld应用程序稍高级一些，但消息被输出到了调试窗口。
Every time you consider writing a debug printout, consider writing a unit-test instead. (or turn int into logging statement).
用单元测试或者记录日志来代替测试时的输出。
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