文件名称:radius-and-circumference
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定义一个Circle类，有数据成员半径Radius，成员函数GetArea()，计算圆的面积，构造一个Circle的对象进行测试。
-Define a Circle class, the data member radius of Radius, the member function GetArea (), calculate the area of a circle, construct a Circle object to be tested.
-Define a Circle class, the data member radius of Radius, the member function GetArea (), calculate the area of a circle, construct a Circle object to be tested.
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复件 radius and circumference.txt