オブジェクト向けプログラミング——C++

C++      ，   ，     .....

 

//Father.h
class Father  
{
public:
	Father();
	virtual ~Father();


	int getInt();
	int setInt();


	virtual int vsetInt();

};
//Son.h
class Son : public Father  
{
public:
	Son();
	virtual ~Son();


	int getInt();
	int setInt();
	
	virtual int vsetInt();

};

 
 
 

//Father.cpp
Father::Father()
{

}

Father::~Father()
{

}

int Father::getInt()
{
	printf("Father:   getInt()
");
	return 1;
}

int Father::setInt()
{
	printf("Father:   setInt()
");
	return 2;
}

int Father::vsetInt()
{
	printf("Father:   vsetInt()
");
	return 11;
}



//Son.cpp
Son::Son()
{

}

Son::~Son()
{

}

int Son::getInt()
{
	printf("Son:   getInt()
");
	return 3;
}
int Son::setInt()
{
	printf("Son:   setInt()
");
	return 4;
}

int Son::vsetInt()
{
	printf("Son:   vsetInt()
");
	return 5;
}

 
 
試験手順:
 
 

int main(int argc, char* argv[])
{

	printf("Derived: Father* fa=new Son();-----------------------------------
");
	Father* fa=new Son();
	printf("%d
",fa->getInt());
	printf("%d
",fa->setInt());
	printf("--------Virtual Method---------------------------
");
	printf("%d
",fa->vsetInt());
	//printf("%d
",fa->Son::vsetInt());  //Son' : is not a member of 'Father'

	
	printf("

");
	printf("Derived: Son* fa2=new Son();-----------------------------------
");
	Son* fa2=new Son();
	printf("%d
",fa2->getInt());
	printf("%d
",fa2->setInt());
	printf("---------Virtual Method--------------------------
");
	printf("%d
",fa2->vsetInt());
	printf("%d
",fa2->Father::vsetInt());

printf("

");  
printf("Derived: Son* fa3=new Father();-----------------------------------
");  
Son* fa3=(Son*)new Father();  
printf("%d
",fa3->getInt());  
printf("%d
",fa3->setInt());  
printf("---------Virtual Method--------------------------
");  
printf("%d
",fa3->vsetInt());  
printf("%d
",fa3->Father::vsetInt());  
	return 0;
}

 
 

    ：

Derived: Father* fa=new Son();-----------------------------------
Father:   getInt()
1
Father:   setInt()
2
--------Virtual Method---------------------------
Son:   vsetInt()
5


Derived: Son* fa2=new Son();-----------------------------------
Son:   getInt()
3
Son:   setInt()
4
---------Virtual Method--------------------------
Son:   vsetInt()
5
Father:   vsetInt()
11

Derived: Son* fa3=new Father();-----------------------------------
Son:   getInt()
3
Son:   setInt()
4
---------Virtual Method--------------------------
Father:   vsetInt()
11
Father:   vsetInt()
11