a1060916181的博客

#include<iostream> using namespace std; class shape { public: virtual double area() = 0; }; class Circle :public shape { public: Circle(float rr) :r(rr) {} virtual double area() { return 3.14 * r * r; } private: float r; }; class Rectangle :pu.

#include <iostream> #include <string.h> using namespace std; class Teacher { public://公用部分 Teacher(string nam, int a, string t) { //构造函数 name = nam; age = a; title = t; } void display() { ...

#include<iostream> using namespace std; class A { public: A() { cout << "constructing A" << endl; } ~A() { cout << "析构函数 A" << endl; } }; class B :public A { public: B() { cout << "constructing B" << en...