Introduction - If you have any usage issues, please Google them yourself
Understand grasp the abstract and concrete classes C++ realization understand operator overloading. Experiment: (a) From the Point, Circle class abstract base class Shape, research abstract and concrete classes of interface and implementation. (2) derived from a square cylinder class and the class, and then write a test program, the output square area and volume of a cylinder. (3) In the Circle class operator overloading of relations (< , < =, ==,! =,> ,> =), To achieve by the radius of the right sort Circle object.