汗一下，以前只用过结构体之间赋值，现在可以传参数和做返回值了。
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C89 !
C allows three operations on whole structures.
Assignment of whole structures:
s1 = s2; /* s1 and s2 are structures of the same type */
Passing a whole structure to a function:
f(s1);
Returning a whole structure from a function:
s1 = f(s2);
No other operations are allowed, including testing whole structures for equality.
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