类不能继承接口，只能实现接口

#include "stdafx.h"
#include <iostream>
using namespace std;
class abstractClass
{
public:
virtual void printFS() = 0;
virtual int get_value() = 0;
};

class inheritClass:public abstractClass
{
public:
inheritClass():m_value(0){};
virtual void printFS();
//virtual int get_value();
private:
int m_value;
};
void inheritClass::printFS()
{
cout<<"this is inheritclass's FS"<<endl;
}
/*int inheritClass::get_value()
{
return m_value;
}*/
int _tmain(int argc, _TCHAR* argv[])
{
abstractClass *ptr = new inheritClass;
cout<<ptr->get_value()<<endl;
return 0;
}

如上所示，就会报错error C2259 cannot instantiate abstract class

1、类不能继承接口，只能实现接口；
2、既然是实现接口，当然就要实现接口里面的所有方法和属性;