继承的构造和析构

class Child : public Parent
{
public:
        //隐式调用父类中的无参构造函数
    Child()
    {
        cout << "Child()" << endl;
    }
    //显式调用父类构造函数
    Child(string _str) : Parent(_str)
    {
        name = _str;
        cout << "Child(string _str):"<< name<< endl;
    }
};

// 继承的构造和析构.cpp : 此文件包含 "main" 函数。程序执行将在此处开始并结束。
//
#include <iostream>
#include <string>
using namespace std;
class Grandfather
{
public:
    Grandfather()
    {
        cout << " Grandfather()" << endl;
    }
    Grandfather(string _str)
    {
        cout << "Grandfather(string _str):" << _str << endl;
    }
};
class Parent :public Grandfather
{
protected:
    string name;
public:
    Parent() : Grandfather("default")
    {
        cout << "Parent()" << endl;
    }
    Parent(string _str):Grandfather("Grandfather")
    {
        name = _str;
        cout << "Parent(string _str):"<<name << endl;
    }
};
class Child : public Parent
{
    Grandfather guest;
public:
    Child() : guest("default")
    {
        cout << "Child()" << endl;
    }
    //显式调用父类构造函数
    Child(string _str) : Parent("father"),guest("guest")
    {
        name = _str;
        cout << "Child(string _str):"<< name<< endl;
    }
};
int main()
{
    Child chenge("son");
}

 1 // 继承的构造和析构.cpp : 此文件包含 "main" 函数。程序执行将在此处开始并结束。
 2 //
 3 #include <iostream>
 4 #include <string>
 5 using namespace std;
 6 class Grandfather
 7 {
 8     string name;
 9 public:
10     Grandfather()
11     {
12         cout << " Grandfather()" << endl;
13     }
14     Grandfather(string _str)
15     {
16         name = _str;
17         cout << "Grandfather(string _str):" << _str << endl;
18     }
19     ~Grandfather()
20     {
21         cout << "~Grandfather():" << name << endl;
22     }
23 };
24 class Parent :public Grandfather
25 {
26     string name;
27 public:
28     Parent() : Grandfather("default")
29     {
30         name = "default";
31         cout << "Parent()" << endl;
32     }
33     Parent(string _str):Grandfather("Grandfather")
34     {
35         name = _str;
36         cout << "Parent(string _str):"<<name << endl;
37     }
38     ~Parent()
39     {
40         cout << "~Parent():" << name << endl;
41     }
42 };
43 class Child : public Parent
44 {
45     string name;
46     Grandfather guest;
47 public:
48     Child() : guest("default")
49     {
50         name = "default";
51         cout << "Child()" << endl;
52     }
53     //显式调用父类构造函数
54     Child(string _str) : Parent("father"),guest("guest")
55     {
56         name = _str;
57         cout << "Child(string _str):"<< name<< endl;
58     }
59     ~Child()
60     {
61         cout << "~Child():" << name << endl;
62     }
63 };
64 int main()
65 {
66     Child chenge("son");
67 }