To understand function overloading, we must understand how to define a set of overloaded functions and how the compiler decides which function to use for a given call.

要理解函数重载，必须理解如何定义一组重载函数和编译器如何决定对某一调用使用哪个函数。

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This enables the user to differentiate between overloaded functions.

这使用户能够区分重载函数。

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The return types can be the same or different on overloaded functions.

被重载函数的返回类型可以相同也可以不同。

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