warning: control reaches end of non-void function
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用gcc编译时，出现这样的错误。
warning: control reaches end of non-void function
意思是： 在非void函数的结尾。就是说你的一些本应带有返回值的函数到达结尾后可能并没有返回任何值。这时候，最好检查一下是否每个控制流都会有返回值。
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