Description: 1, the definition of overloaded functions must have a different number of arguments, or different types of parameters. Only in this way can compile system according to different parameter to invoke different overloaded function. Only the return value is not at the same time, cannot be defined as overloaded function. That is the only function of different types, cannot be defined as overloaded function call function overloading refers to complete different function can have the same function name.
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