文件名称:shape
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一、声明一个Shape抽象类，在此基础上派生出Rectangle和Circle类，二者都有GetArea（）和GetPerim（）函数，GetArea用来计算对象的面积，GetPerim用来计算对象的周长。封装上述各类，并编写测试程序。
-First, declare an abstract class Shape, on this basis, derived classes Rectangle and Circle, the two have GetArea () and GetPerim () function, GetArea used to calculate the object' s size, GetPerim used to calculate the object perimeter. The above types of packaging and the preparation of test programs.
-First, declare an abstract class Shape, on this basis, derived classes Rectangle and Circle, the two have GetArea () and GetPerim () function, GetArea used to calculate the object' s size, GetPerim used to calculate the object perimeter. The above types of packaging and the preparation of test programs.
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shape.cpp