Introduction - If you have any usage issues, please Google them yourself
Declare a class a base class circle, including members of the data radius R have member functions: a constructor to initialize the base class members realize the data, calculate the area of a circle member function, the output member functions required output radius R. The round class as a base class, through public inheritance, derived cylinder class, the derived class member data new high (H) new member functions have a constructor, to calculate the volume of a cylinder function, the output function of all members. main () test to complete the derived class object definitions and related functions