这两者，关于抽象函数的区别，自己还没有完全区分开来

#include<iostream>

using namespace std;
//实现多继承场景
class Interface
{
public:
	virtual int  add(int a,int b)=0;
	virtual void  print()=0;
private:
	int i1;
protected:
};
class Interface2
{
public:
	virtual int  multi(int a,int b)=0;
	virtual void  print()=0;
private:
	int i2;
protected:
};

class Child:public Interface,public Interface2
{
public:
	void print()
	{
		cout<<"Child 的 打印
";
	}
	int  add(int a,int b)
	{
		return a+b;
	}
	int multi(int a,int b)
	{
		return a*b;
	}

	
private:
	int c;
protected:
};
int main()
{
	Child c;
	c.print();

	
	cout<<"  add";
	cout<<c.add(2,3);
	cout<<endl;

	cout<<"      multi ";
	cout<<c.multi(3,4);
	cout<<endl;

	Interface *i1=&c;
	Interface2 *i2 =&c;
	cout<<i1->add(2,4);
		cout<<endl;
	cout<<i2->multi(7,8);
		cout<<endl;
		i1->print();
		i2->print();
	system("pause");
	return 0;
}

　　

#include<iostream>

using namespace std;
//编写一个C++程序, 计算程序员( programmer )工资
//	1 要求能计算出初级程序员( junior_programmer ) 中级程序员 ( mid_programmer )高级程序员( adv_programmer)的工资
//	2 要求利用抽象类统一界面,方便程序的扩展, 比如:新增, 计算 架构师 (architect ) 的工资
//

class saraly
{
public:
	virtual void salary()=0;

};
class junior_programmer:public saraly
{
public:
	junior_programmer(char *name,char *kind,int sal)
	{
		this->kind=kind;
		this->name=name;
		this->sal=sal;
	}
	virtual void salary()
	{
		cout<<"the salary of the junior_programmer is "<<sal<<endl;
	}
protected:
private:
	char *name ;
	char *kind;
	int sal;
};
class mid_programmer:public saraly
{
public:
	mid_programmer(char *name,char *kind,int sal)
	{
		this->kind=kind;
		this->name=name;
		this->sal=sal;
	}
	virtual void salary()
	{
		cout<<"the salary of the mid_programmer is "<<sal<<endl;
	}
protected:
private:
	char *name ;
	char *kind;
	int sal;
};

class adv_programmer:public saraly
{
public:
	adv_programmer(char *name,char *kind,int sal)
	{
		this->kind=kind;
		this->name=name;
		this->sal=sal;
	}
	virtual void salary()
	{
		cout<<"the salary of the adv_programmer is "<<sal<<endl;
	}
protected:
private:
	char *name ;
	char *kind;
	int sal;
};

void Getsalary(saraly *base)
{
	base->salary();
}
int main()
{
	
	junior_programmer jp("Alice ","junior ",400);

	mid_programmer mp("Alenx","mid",8000);
	adv_programmer ap("Juster", "adv",1500);
	Getsalary(&jp);
	Getsalary(&mp);
	Getsalary(&ap);
	system("pause");
	return 0;
}