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The pro tee ted access category is a balance between private and public categories: private members are accessible only from within the class itself and its friend classes; protected members are accessible from within the class itself, its friend classes, its derived classes, and their friend classes; pub1 ic members are accessible from anywhere within the file. In general, pro tee ted is used instead of private whenever it is anticipated that a subclass might be defined for the class. A subclass inherits all the pub1 ic and pro tee ted members of its base class. This means that, from the point of view of the subclass, the pub1 ic and pro tee ted members of its base class appear as though they actually were declared in the subclass. For example, suppose that class x and subclass Y are defined as

Thus in equilateral triangle ABC, a b c. Note that an equilateral triangle is also an isosceles triangle.

class X { public: int a; protected: int b; private: int c; >; class Y : public X { public: int d; > ;

Triangles According to the Kind of Angles (Fig. 1-30) 1. Right triangle: A right triangle is a triangle having a right angle.

Private Sub Command1_Click() NextScore = ThrowDice() Text2.Text = Str(NextScore) If (NextScore = FirstScore) Then Label3.Caption = "You Win" Wins = Wins + 1 SetButtons ElseIf (NextScore = 7) Then Label3.Caption = "You Lose" Losses = Losses + 1 SetButtons End If End Sub Private Sub Command2_Click() Form1.Text1 = Str(Wins) Form1.Text2 = Str(Losses) Form2.Hide End Sub

x x; y y;

Thus in right triangle ABC, /C is the right angle. Side c opposite the right angle is the hypotenuse. The perpendicular sides, a and b, are the legs or arms of the right triangle.

The pub1 ic member a of class x is inherited as a pub1 ic member of y, and the protected member b of class x is inherited as a protected member of y. But the private member c of class x is not inherited by Y. (The horizontal lines in each object indicate the separate the public, protected, and private regions of the object.)

If Y is a subclass of x, then Y objects inherit all the public and protected member data and member functions of X. For example, the name data and printName ( > function in the Person class are also members of the Student class. In some cases, you might want to define a local version of an inherited member. For example, if a is a data member of x and if Y is a subclass of X, then you could also define a separate data member named a for Y. In this case, we say that the a defined in Y dominates the a defined in x. Then a reference Y. a for an object Y of class Y will access the a defined in Y instead of the a defined in x. To access the a defined in x, one would use y . x : : a. The same rule applies to member functions. If a function named f ( > is defined in x and another function named f ( > with the same signature is defined in Y, then Y. f ( > invokes the latter function, and y . x : : f ( > invokes the former. In this case, the local function y . f ( > overrides the f ( > function defined in x unless it is invoked as y . x : : f ( > . These distinctions are illustrated in the following example.

Fig. 1-30

class X { public: void f(> int a; > ;

(a) sin A (b) tan A (c) cos A 60 0.6018 is the nearest-degree sine value, m A 37 . 0.6000. Since sin 37 100 10 0.4167. Since tan 23 0.4245 is the nearest-degree tangent value, m A 23 . 24 1500 0.8824. Since cos 28 0.8829 is the nearest-degree cosine value, m A 28 . 1700

<< "X::f() executing\n";

Trigonometric ratios of 30 and 60 Show that (a) tan 30 (b) sin 30 0.577 0.500 (c) cos 30 (d) tan 60 0.866 1.732 (e) sin 60 (f) cos 60 0.866 0.500

class Y : public X { public: void f() { tout << "Y::f() executing\n"; int a;