proj11_10.cpp

来自「C++程序设计教程的全部源代码 包含与教程同步的PPT 方便学习」· C++ 代码 · 共 31 行

#include <iostream.h>
class A
{
public:
    A(){cout << "A 构造函数\n";}
    ~A(){cout << "A 析构函数\n";} 
    virtual void use(){cout << "in A\n";}
};
class B:public A
{
public:
    B(){cout << "B 构造函数\n";}
    ~B(){cout << "B 析构函数\n";}
    virtual void use(){cout << "in B\n";}
};
class C:public B
{
public:
    C(){cout << "C 构造函数\n";}
    ~C(){cout << "C 析构函数\n";}
    virtual void use(){cout << "in C\n";}
};
void main()
{
	A *obj;
	obj = new C();
	obj->use();
	delete obj;
}