抽象類在多繼承中的應用

#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
using namespace std;

class Interface1
{
public:
	virtual int add(int a, int b) = 0;
	virtual void print() = 0;
};

class Interface2
{
public:
	virtual int mult(int a, int b) = 0;
	virtual void print() = 0;
};

class Parent
{
public:
	int getA()
	{
		a = 0;
		return a;
	}
private:
	int a;

};

class Child : public Parent, public Interface1, public Interface2
{
public:
	virtual int add(int a, int b)
	{
		cout << "Child: add() 已經執行" << endl;
		return a + b;
	}
	virtual void print()
	{
		cout << "Child: print() 已經執行" << endl;
	}
	virtual int mult(int a, int b)
	{
		cout << "Child: mult() 已經執行" << endl;
		return a * b;
	}

};





int main()
{
	
	Child c1;
	c1.print();

	Interface1 *if1 = &c1;
	if1->add(1, 2);


	Interface2 *if2 = &c1;
	if2->mult(1, 2);

	system("pause");
	return 1;
}