3749 - 7-6修改版

定义一个哺乳动物类Mammal，构造函数输出一行"Constructor of Mammal."；析构函数输出一行"Destructor of Mammal."。

再由此派生出狗类Dog，构造函数输出"Constructor of Dog."；析构函数输出一行"Destructor of Dog."。

从键盘输入一个正整数n，创建n个Dog类对象,要求在全部构造函数调用结束之后再自动调用全部析构函数。

Input

Output

Examples

Input

Output

Constructor of Mammal.
Constructor of Dog.
Constructor of Mammal.
Constructor of Dog.
Destructor of Dog.
Destructor of Mammal.
Destructor of Dog.
Destructor of Mammal.

Solution C++

#include<iostream>
using namespace std;

class Mammal{
public:
	Mammal(){
	    cout<<"Constructor of Mammal."<<endl;
	}
	~Mammal(){
	    cout<<"Destructor of Mammal."<<endl;
	}
};

class Dog:public Mammal{
public:	
	Dog(){
	    cout<<"Constructor of Dog."<<endl;
	}
	~Dog(){
	    cout<<"Destructor of Dog."<<endl;
	}
};

int main(){
	int n;
	cin>>n;
	Dog *p = new Dog[n];
	delete[] p;
    return 0;
}

Time Limit	1 second
Memory Limit	128 MB

Discuss Stats

上一题下一题