C++ 继承

#include
using namespace std;

class Base {

    int a;

public:

    Base() 
    {
        cout << "嘿嘿" << endl;
    }
   
};

class BBB {
public:
    BBB()
    {
        cout << "哈哈"< 
输出结果：
 
哈哈
 嘿嘿
 
换一下位置：
 
class Derived : public Base,public BBB
 
输出：
 
嘿嘿
 
哈哈
 
 
#include
using namespace std;

class Base {
public:

	Base() 
	{ 
		cout << 'A';
	}

	Base(char c) 
	{
		cout << c;
	}

};

class Derived :public Base {

public:

	Derived(char c) //输出AB
//如果改为Derived(char c):Base(c) 输出BB
	{
		cout << c; 
	}

};

int main() {

	Derived d('B');

	return 0;

}
 
输出：AB
 
如果改为：Derived(char c)：Base(c) 
 
输出：BB
 
 
#include
using namespace std;

class b1 {

public:

	b1(int x) { cout << x; }

	~b1()
	{ 
		cout << 'b';
	}

};

class b2 {

public:

	b2(int x) { cout << x; }

	~b2()
	{ 
		cout << 'd';
	}

};

class derived :public b2, public b1 {

public:

	derived(int x, int y) :b1(y), b2(x)

	{
		cout << 'e';
	}

	~derived() 
	{ 
		cout << 'f'; 
	}

};

int main() {

	derived obj(5, 7);

	return 0;

}
 
输出
 
57efbd