构造函数与析构函数研究

首先先贴代码

#include <iostream>using namespace std;class A {public:A() { cout << "class A is constructed" << endl;}~A() { cout << "class A is destroyed" << endl; }//methodvoid fa() { cout << "class A fa method" << endl;}void fb() { cout << "class A fb method" << endl;}};class B : public A{public:B() { cout << "class B is constructed" << endl;}~B() { cout << "class B is destroyed" << endl; }//methodvoid fa() { cout << "class B fa method" << endl;}void fb() { cout << "class B fb method" << endl;}};int main(){A *pa = new A;B *pb = new B;cout << endl;pa->fa();pa->fb();cout << endl;pb->fa();pb->fb();cout << endl;delete pa;delete pb;cout << endl;return 0;}

 

 

运行结果如下：

class A is constructedclass A is constructedclass B is constructedclass A fa methodclass A fb methodclass B fa methodclass B fb methodclass A is destroyedclass B is destroyedclass A is destroyed 

 

细心的娃肯定能发下些问题了，在子类的构造函数中先构造父类然后在构造子类，析构时先析构子类然后再析构父累

 

 

PS：这个题上次去Foxit有考，刚开始我是这么想的，后来居然给改了，郁闷阿...........