文件名称:friend
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友元
编写C++程序完成以下功能：
定义一个Boat和Car两个类，他们都具有私用属性——重量；
编写一个函数，计算两者的重量和。
double TotalWeight(Boat& b, Car& c) -Friend write C++ program to perform the following functions: define a Boat and Car two classes, they have private property- weight write a function to calculate both the weight and. double TotalWeight (Boat & b, Car & c)
编写C++程序完成以下功能：
定义一个Boat和Car两个类，他们都具有私用属性——重量；
编写一个函数，计算两者的重量和。
double TotalWeight(Boat& b, Car& c) -Friend write C++ program to perform the following functions: define a Boat and Car two classes, they have private property- weight write a function to calculate both the weight and. double TotalWeight (Boat & b, Car & c)
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友元.cpp