这与调用所有其它子程序的“主例程”类似。

This is analogous to a "main routine" which invokes all other subroutines.

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我们也会使您了解一些需要解释的示例程序中的关键命令。

We would also take you through some critical commands in the example program which require explanation.

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该方法释放您先前创建的内存块，并使得从分配程序例程返回的所有指针失效。

It frees every memory block you created earlier and invalidates all the Pointers returned from the allocator routines.

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