Problem A: 还会用继承吗？

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Problem A: 还会用继承吗？

Time Limit: 1 Sec Memory Limit: 128 MB
Submit: 1321 Solved: 943
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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,

#include <iostream>#include <cstring>#include <algorithm>using namespace std;class Base{public:    int n;    Base(int n):n(n){cout<<"Base = "<<n<<" is created."<<endl;}    ~Base(){cout<<"Base = "<<n<<" is erased."<<endl;}     Base(const Base& b){n=b.n;cout<<"Base = "<<n<<" is copied."<<endl;}};class Derived:public Base{public:    int d;    Derived(int d):Base(d){cout<<"Derived = "<<d<<" is created."<<endl;}    ~Derived(){cout<<"Derived = "<<d<<" is erased."<<endl;}    Derived(const Derived & der):Base(der),d(der.d){cout<<"Derived = "<<d<<" is copied."<<endl;}    Derived(int x,int y):Base(x),d(y){cout<<"Derived = "<<d<<" is created."<<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);    }}

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