写代码时，老是不太确定静态存储区的初始值是不是为零，现在把这网上搜到放进来，以后应该印象很深了。。
总结起来就是：未初始化的静态存储对象一律清零。
c99 6.7.8 Initialization:
10 If an object that has automatic storage duration is not initialized explicitly, its value is
indeterminate. If an object that has static storage duration is not initialized explicitly,
then:
— if it has pointer type, it is initialized to a null pointer;
— if it has arithmetic type, it is initialized to (positive or unsigned) zero;
— if it is an aggregate, every member is initialized (recursively) according to these rules;
— if it is a union, the first named member is initialized (recursively) according to these
rules.
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