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:




:

































 

 

 

 





 

, - . . . .

.

class Basis

{ int a,b;

public:

Basis(int x,int y){a=x;b=y;}

};

class Inherit:public Basis

{int sum;

public:

Inherit(int x,int y, int s):Basis(x,y){sum=s;}

};

: , - ( ), . , .

: , -, .

, .

 

, . , , .

() . , virtual.

.

class base

{

public:

virtual void print(){cout<<\nbase;}

...

};

 

class dir: public base

{

public:

void print(){cout<<\ndir;}

};

void main ()

{

base B,*bp = &B;

dir D,*dp = &D;

base *p = &D;

bp >print(); // base

dp >print(); // dir

p >print(); // dir

}

 

, , .. , .

, , , ( ) , .

-.

. , ( ) , virtual .

, . , , .

 

, () .

, :

virtual _ (__) = 0;

. . .

, . . . . . , .

.

class Base{

public:

 

Base(); //

Base(const Base&); //

virtual ~Base(); //

virtual void Show()=0; //

//

protected: //

private:

// ,

};

class Derived: virtual public Base{

public:

Derived(); //

Derived(const Derived&); //

Derived(); //

virtual ~Derived(); //

void Show(); //

//

//

protected:

// private,

private:

//

};

, . , . .

. . , , . .

: . , Draw, : TTriangle, TCircle, TSquare. TGraphObject. ,

 

TGraphObject . Draw () TGraphObject, TTriangle, TCircle, TSquare.

, . - , ++, , , . , TGraphObject, . . Draw , , . Draw TGraphObject , Draw TGraphObject . , -, Draw .





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