Problem B: 还会用继承吗？

Problem B: 还会用继承吗？

Time Limit: 1 Sec   Memory Limit: 128 MB
Submit: 2574   Solved: 1869
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Description

定义一个Base类，包括1个int类型的属性，以及满足输出格式要求的构造函数、拷贝构造函数和析构函数。

定义Base类的子类Derived，包括1个int类型的属性， 以及满足输出格式要求的构造函数、拷贝构造函数和析构函数。

Input

第1行N>0表示测试用例个数。

每个测试包括2个int类型的整数。

Output

见样例。

Sample Input

110 20

Sample Output

Base = 10 is created.Base = 10 is copied.Base = 10 is created.Derived = 20 is created.Base = 10 is copied.Derived = 20 is copied.Derived = 20 is erased.Base = 10 is erased.Derived = 20 is erased.Base = 10 is erased.Base = 10 is erased.Base = 10 is erased.

HINT

Append Code

append.cc,

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#include<bits/stdc++.h>

using namespace std;

class Base

{

private :

     int x_;

public :

     Base( int x):x_(x){cout<< "Base = " <<x_<< " is created." <<endl;}

     Base( const Base &b)

     {

         x_=b.x_;

         cout<< "Base = " <<x_<< " is copied." <<endl;

     }

     ~Base(){cout<< "Base = " <<x_<< " is erased." <<endl;}

};

class Derived : public Base

{

private :

     int x_;

public :

     Derived( int x, int y):x_(y),Base(x)

     {cout<< "Derived = " <<x_<< " is created." <<endl;}

     Derived( const Derived &b):Base(b)

     {

         x_=b.x_;

         cout<< "Derived = " <<x_<< " is copied." <<endl;

     }

     ~Derived()

     {

         cout<< "Derived = " <<x_<< " is erased." <<endl;

     }

};

int main()

{

     int cases, data1, data2;

     cin>>cases;

     for ( int i = 0; i < cases; i++)

     {

         cin>>data1>>data2;

         Base base1(data1), base2(base1);

 

         Derived derived1(data1, data2), derived2(derived1);

     }

}