3GL   4GL   5GL   .

- ++

++

, , . ++. ++ , . , .

, , , . .

:

class Parent {....};
class Child : [ ] Parent {....};

- (:), . -. , , - "" -. , "" private (), public () protected (), . , private , , public , . , protected. protected , , , . Protected private : .

, , , .

   
public protected private
public public protected private
protected protected protected private
private

, , .

, / .

, , . .. , , (--), : - - . : - - .

, " " , , , , , . , , .

class BaseClass
{
public:
 BaseClass() {cout << ' \n';}
 ~BaseClass() {cout << ' \n';}
};

class DerivedClass: public BaseClass
{
public:
 DerivedClass() {cout << ' \n';}
 ~DerivedClass() {cout << ' \n';}
};

main()
{
 DerivedClass obj;
}




, . . , . , . , , . .

__ ( )
 : __ ( )
{
 ... //
}

. , . , , , .. , , .

class BaseClass
{
 int i;
public:
 BaseClass (int ii) {i=ii;}
 ~BaseClass() {cout << ' \n';}
};

class DerivedClass: public BaseClass
{
 int n;
public:
 DerivedClass (int nn, int m): BaseClass (m) {n=nn;}
 ~DerivedClass() {cout << ' \n';}
};

main()
{
 DerivedClass obj(2,3);
}

, , .

class BaseClass
{
 int j, i;
public:
 BaseClass (int jj, int ii) {j=jj; i=ii;}
 ~BaseClass() {cout << ' \n';}
};

class DerivedClass: public BaseClass
{
 int n;
public:
 DerivedClass (int nn);
 ~DerivedClass() {cout << ' \n';}
};

DerivedClass :: DerivedClass (int nn): BaseClass (nn/2, nn%2)
{ n=nn; }

main()
{
 DerivedClass obj(15);
}

, (!!!) .

, . , .

struct Point
{
int X;
int Y;
};

, , "". :

enum Boolean {false, true}; // false = 0, true = 1
struct Point
{
 int X;
 int Y;
 Boolean Visible;
};

Boolean . enum true () false (). 0, Boolean : 0 1 ( ).

_3d, Point. , "" . , , - , , . :

enum Boolean {false, true}; // false = 0, true = 1
class Point
{
protected:
 int X;
 int Y;
 Boolean Visible;
public:
 int GetX(void) { return X; }
 int GetY(void) { return Y; }
 Boolean isVisible (){ return Visible;}
 Point (const Point& cp); //
 Point (int newX =0, int new Y =0); //
};

Point :: Point (int NewX, int NewY) //
{
 X = newX; Y = newY; Visible = false;
}

Point :: Point (const Point& cp) //
{
 X = cp.X; Y = cp.Y; Visible = cp.Visible;
}

Point:

Point Center(320, 120); // Center Point
Point *point_ptr; // Point
point_ptr = &Center; // Center

:

Point aPoint ();
Point Row[80]; // Point
Point bPoint (100);

Point , . Point .

class Point
{
 ...
public:
 ...
 void Show();
 void Hide();
 void MoveTo(int newX, int newY);
};

void Point::Show()
{
 Visible = true;
 putpixel (X,Y,getcolor());
}

void Point::Hide()
{
 Visible = false;
 putpixel (X,Y,getbkcolor());
}

void Point::MoveTo (int newX, int newY)
{
 Hide ();
 X = newX;
 Y = newY;
 Show ();
}

, Point, , , .

Point pointA (50,50);
pointA.Show ();
pointA.MoveTo (100,130);
pointA.Hide ();

, : " ", Point, . , , , Point , / .

Circle . , , . , ( X Y / ) . -, Circle , Radius, , Circle, , Point. Circle X, Y, Visible, Circle.

class Circle: public Point
{
 int Radius; // private
public:
 Circle (int initX, int initY, int initR);
 void Show ();
 void Hide ();
 void Expand (int deltaR);
 void Contract (int deltaR);
 void MoveTo (int newX, int newY);
};

Circle::Circle (int initX, int initY, int initR) //
 :Point (initX, initY) //
{
 Radius = initR;
}

void Circle::Show ()
{
Visible = true;
circle (X,Y, Radius);
}

void Circle::Hide () // =
{
 Visible = false;
 unsigned int tempColor = getcolor ();
 setcolor (getbkcolor());
 circle (X,Y, Radius);
 setcolor (tempColor);
}

void Circle::Expand (int deltaR)
{
 Hide();
 Radius += deltaR;
 Show();
}

void Circle::Contract (int deltaR)
{
 Expand (-deltaR);
}

void Circle::MoveTo (int newX, int newY)
{
 Hide ();
 X = newX;
 Y = newY;
 Show ();
}

main()
{
 int graphDr = DETECT, graphMode;
 initgraph ( &graphDr, &graphMode, "");
 
 Circle C (150,200,50); // .(150, 200) 50
 C.Show(); //
 getch();
 C.MoveTo (300,100); //
 getch();
 C.Expand (50); //
 getch();
 C.Contract (70); //
 getch();
 
 closegraph();
}

Circle Point, , , Circle Point X, Y, Visible, isVisible(), GetX(), GetY(). Show(), Hide() MoveTo() Circle, , , , , , .

, Circle Circle Point. Circle::Expand. Radius. . Radius private Circle. Radius Circle.

Circle::Hide Circle::Show. Visible Point. Visible protected Point. Circle public Point. , Visible protected Circle. , Visible private Point, Circle. Visible c public. Visible .

.

, . :

, . , , .

,

Point APoint, *ptrPoint;
Circle ACircle, *ptrCircle;

:

APoint = ACircle;

.

.

, :

1. ,
2. , . , , () , , .

. .

, , .

. , .

. ,

void Proc (Point param)

Point, Circle .

        3GL   4GL   5GL   .

, - , - . , , . , , - .




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