这将返回一个副本。 C是一个传递价值的语言。除非您指定围绕传递指针，结构被复制的任务，return语句，并作为函数参数使用时。

It would return a copy. C is a pass-by-value language. Unless you specify that you are passing pointers around, structures get copied for assignments, return statements, and when used as function parameters.