编程要求 编写程序声明一个基类 BaseClass，构造其派生类DerivedClass，在构造函数和析构函数中用 cout 输出提示信息，观察构造函数和析构函数的执行情况。根据提示，在右侧编辑器补充代码，并输出正确的值。 测试说明 平台会对你编写的代码进行测试： 测试输入： 预期输出： Construction. Number = 1 Destruction. Number = 0

下面是代码实现：

#include <iostream>
using namespace std;

class BaseClass{
public:
    static int number;
    BaseClass(){
        number++;
        cout << "Construction. Number = " << number << endl;
    }
    ~BaseClass(){
        number--;
        cout << "Destruction. Number = " << number << endl;
    }
};

int BaseClass::number = 0;

class DerivedClass : public BaseClass{
public:
    DerivedClass(){
        cout << "DerivedClass Construction." << endl;
    }
    ~DerivedClass(){
        cout << "DerivedClass Destruction." << endl;
    }
};

int main(){
    DerivedClass derivedClass;
    return 0;
}

输出结果为：

Construction. Number = 1
DerivedClass Construction.
DerivedClass Destruction.
Destruction. Number = 0