精选优质文档-倾情为你奉上【实验目的】1，实例化一个类2，声明并使用重载方法3，通过重载方法计算圆面积，长方形面积【实验内容】namespace yy class area const double PI = 3.; private double R, W, L; public void alter(double r) R = r; public double getarea(double r) R = r; return PI * R * R; public void alter(double Lb, double Wb) L = Lb; W = Wb;
