清单4 .初始化命令。
是的，所有这些代码都是初始化命令行选项的。
Yes, all that code just initialized the command-line options.
这里很多编译器都一定会抱怨“向前引用”，因为它与初始化命令有关而与这个程序的编译方式无关。
This is one place in which the compiler, appropriately, does complain about forward referencing, since this has to do with the order of initialization and not the way the program is compiled.
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