c+＋继承性小练

例5-1单继承

#include
using namespace std;
class  Base
{
private:
	int b1;
protected:
	int b2;
public:
	void set(int m, int n)
	{
		b1 = m;
		b2 = n;
	}
	void show()
	{
		cout << "b1=" << b1 << endl;
		cout << "b2=" << b2 << endl;
	}
};
class Derived :public Base  //声明一个公有派生
{
private:
	int d;
public:
	void setall(int m, int n, int l)
	{
		set(m, n);
		d = l;
	}
	void showall()
	{
		//cout<<"b1="<//构造函数与析构函数的调用次序
#include
using namespace std;
class Member
{
public:
	Member()
	{
		cout << "constructing Membern";
	}
	~Member()
	{
		cout << "destructing Membern";
	}
};
class Base
{
public:
	Base()
	{
		cout << "constructing Basen";
	}
	~Base()
	{
		cout << "destructing Basen";
	}
};
class Derived :public Base//派生类定义
{
private:
	Member mem;
public:
	Derived()
	{
		cout << "constructing Derivedn";
	}
	~Derived()
	{
		cout << "destructing Derivedn";
	}
};
int main()
{
	Derived obj;
	return 0;
}

基类带参构造函数调用示例

#include
using namespace std;
class Base
{
private:
	int x;
public:
	Base(int i)
	{
		x = i;
		cout << "constructing Basen";
	}
	void show()
	{
		cout << "x=" << x << endl;
	}
};
class Derived :public Base//派生类定义公有
{
private:
	Base d;//Base类的对象成员
public:
	Derived(int i) :Base(i), d(i)//基类对象成员构造函数的调用
	{
		cout << "constructing Deriverdn";
	}
};
int main()
{
	Derived obj(100);
	obj.show();
	return 0;
}