5. Inheritance and class hierarchy

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类的基础语法, 类层次, 虚函数调用, 资源

警告

忘了原题, 这个难度和考点类似而要写的代码更多.

建议直接做 计软智 2022 年试题 最后 1 题, 考点和做法是一样的.

Implement the Shape hierarchy designed in the picture below.

• Each TwoDimensionalShape should contain a member function get_area to calculate the area of the 2D shape.

• Each ThreeDimensionalShape should have member functions get_area and get_volume to calculate the surface area and volume of the 3D shape, respectively.

Create a program that uses a vector of Shape pointers to objects of each concrete class in the hierarchy. The program should print the object to which each vector element points.

• If a shape is a TwoDimensionalShape, display its area.

• If a shape is a ThreeDimensionalShape, display its area and volume.

翻译

实现下面图片所示的 Shape 类层次.

• 每个 TwoDimensionalShape 应该有成员函数 get_area 来计算 2D 图形的面积.

• 每个 :cpp: ThreeDimensionalShape 应该有成员函数 get_area 和 get_volume 来计算 3D 图形的表面积和体积.

编写一个程序, 它使用一个 vector 来存储 Shape 指针, 每个指针都指向类层次中的一个具体类的对象. 该程序应该打印 vector 中每个元素.

• 如果继承自 TwoDimensionalShape, 输出其面积.

• 如果继承自 ThreeDimensionalShape, 输出其表面积和体积.

Class Hierarchy

点击查看解答参考

警告

此卷的所有解答参考都是笔者考试时实际写的代码的回忆版, 所以 相比于其他卷的解答参考可能更为超纲难懂.

主要是在展示以 "C++98 + Lambdas + range-based for + auto + STL" 为学习内容能如何秒杀转专业题目.

[在线代码 ebM7eYTnx]