題目：定義一個基類BaseClass，有整型成員變數Number，構造其派生類DerivedClass，觀察建構函式和解構函式的執行情況。
程式碼如下：

/*定義一個基類BaseClass，有整型成員變數Number，構造其派生類DerivedClass，觀察建構函式和解構函式的執行情況。*/
#include <iostream>
using namespace std;
//以下是類的宣告
class baseclass
{
public:
	int number;
	int getage()
	{
		return i1;
	}
	baseclass()
	{
		cout<<
 
"baseclass類的預設建構函式\n";i1=0;
		cout<<"i1:"<<getage()<<endl;
	}
	baseclass(int i,int j)
	{
		cout<<"baseclass類的有參建構函式\n";i1=i;
		cout<<"i1:"<<getage()<<endl;
	}
	baseclass(baseclass&b1)
	{
		cout<<"baseclass類的拷貝建構函式\n";i1=b1.i1;
		cout<<"i1:"<<
 
getage()<<endl;
	}
	~baseclass()
	{
		cout<<"baseclass類的解構函式\n";}
private:
	int i1;
};
class derivedclass:public baseclass
{
public:
	derivedclass()
	{
		cout<<"derivedclass類的預設建構函式\n";i2=0;
		cout<<"i2:"<<getage()<<endl;
	}
	derivedclass(int i,int j):baseclass(i,j)
 

	{
		cout<<"derivedclass類的有參建構函式\n";i2=j;
		cout<<"i2:"<<getage()<<endl;
	}
	derivedclass(derivedclass&d1):baseclass(d1)
	{
		cout<<"derivedclass類的拷貝建構函式\n";i2=d1.i2;
		cout<<"i2:"<<getage()<<endl;
	}
	~derivedclass()
	{
		cout<<"derivedclass類的解構函式\n";}
private:
	int i2;
};
int main()
{
	derivedclass D;
	derivedclass D2=D;
	derivedclass D3(1,3);
	return 0;
}