c++继承

继承分好多种，先记录点：

一、简单的

公有继承：

class Base
{
private:
	int a_number;
public:
	//Base(){}
	Base(int i) : a_number(i) { }
	int get_number() 
	{ 
		return a_number;
	}
	void print()
	{ 
		cout << "a is: "<<a_number << endl;
	}
};

class Derived : public Base
{
private:
	int d_number;
public:
	// constructor, initializer used to initialize the base part of a Derived object.
	Derived(int i, int j) : Base(i), d_number(j) { };
	// a new member function that overrides the print( ) function in Base
	void print()
	{
		cout << "b is: " << get_number() << " ";// access number through get_number( )
		cout << d_number<< endl;
		
		
	}
};
int main()
{
	Base a(2);
	a.print();  
	Derived b(3, 4);// print( ) in Base
	b.print();                // print( ) in Derived
	cout << "base part of b is: ";
	b.Base::print();                // print( ) in Base
	return 0;
}

2.virtual函数的应用

class A
{
private:
	int a;
public:
	A(int i) : a(i) { }
	virtual void print()       
	{
		cout << a << endl;
	}
	int get_a() 
	{
		//cout << "h" << endl;
		return a;
	}
};
class B
{
private:
	int b;
public:
	B(int j) : b(j) { }
	void print()     
	{ 
		cout << b << endl; 
	}
	int get_b() 
	{ 
		return b;
	}
};
class C : public A, public B
{
	int c;
public:
	C(int i, int j, int k) : A(i), B(j), c(k) { }
	void print()    
	{
		cout << "f" << endl;
		A::print(); B::print();
	}
	// use print( ) with scope resolution
	void get_ab() 
	{ 
		cout << get_a() << " " << get_b() << endl;
	}
	// use get_a( ) and get_b( ) without scope resolution
};
int main()
{
	C x(5, 8, 10);
	A* ap = &x; cout << "调用C:"<<endl;// use C::print( );
	ap->print(); 
	B* bp = &x; cout << "调用B:"<<endl;   // use B::print( );
	bp->print();
	cout << ""<<endl;
	x.A::print();                // use A::print( );
	x.get_ab();                  //use C:

	return 0;
}