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EXAMPLE 11.5 The Person Class with protected Data Members These are the same class definitions that were given in Example 11.3 and Example 11.4 except that the private access specifier has been changed to pro tee ted, and we have added the access function printSex to the Student class: #include "String.h" #include "Date.h" class Person { public: Person(char* n="", int s=O, char* nat=YJ.S.A.") : name(n), sex(s), nationality(nat) { > void setDOB(int m, int d, int y) { dob.setDate(m, d, y); > void setDOD(int m, int d, int y) { dod.setDate(m, d, y); > void printName { tout << name; > void printNationality { tout << nationality; > void printDOB() { tout << dob; > void printDOD() { tout << dod; } protected: String name, nationality; // date of birth, date of death Date dob, dod; //o= female, 1 = male * int sex; >; class Student : public Person { public: Student(char* n, int s=O, char* i=""> : Person(n, s), id(i), credits(O) { } void setDOM(int m, int d, int y) { dom.setDate(m, d, y); > void printDOM() { tout << dom; } v o i d printSex { tout CC ( s e x male : f e m a l e ) ; } protected: // student identification number String id; // date of matriculation Date dom; // course credits int credits; // grade-point average float gpa; >;

1 2 (90 1 3 (360

An object like x is declared just like an ordinary variable. Its type is Rational. We can think of this type as a user-defined type. C++ allows us to extend the definition of the programming language by adding the new Rational type to the collection of predefined numeric types in t, f 1 oat, etc. We can envision the object x like this:

1.10 Applying angle facts In Fig. 1-26, (a) name two pairs of perpendicular segments; (b) find m/a if m/b m/AEB and m/CED.

Notice the use of the specifier Rational : as a prefix to each function name. This is necessary for each member function definition that is given outside of its class definition. The scope resolution operator : : is used to tie the function definition to the Rational class. Without this specifier, the compiler w o u l d not know that the function defined is a member function of the Rat ional class. This can be avoided by including the function definitions within declaration, as shown below in Example 8.2.

When an object like the Rat ional object x in Example 8.1 is declared, we say that the class has been instantiated, and we call the object an instance of the class. And just as we may have many variables of the same type, we may also have may instances of the same class:

Fig. 1-26

Here s the same Rat ional declaration:

(a) Since /ABC is a right angle, AB ' BC. Since /BEC is a right angle, BE ' AC. (b) m/a (c) m/AEB 90 m/b 180 90 42 180 48 . 90 90 . m/CED 180 m/1 180 45 135 .

Public Sub SetButtons() Form2.Command1.Enabled = False Form2.Command2.Enabled = True End Sub Public Sub ResetButtons() Form2.Command1.Enabled = True Form2.Command2.Enabled = False End Sub Public Sub SetLastRoll() Form2.Label2.Enabled = False Form2.Text2.Enabled = False End Sub Public Sub ResetLastRoll() Form2.Label2.Enabled = True Form2.Text2.Enabled = True End Sub Public Sub Initialize() Wins = 0 Losses = 0 Form1.Text1.Text = "0" Form1.Text2.Text = "0" Randomize End Sub

class Rational { public: void assign(int n, int d) { num = n; den = d; } double convert0 { return double(num)/den; } void invert0 { int temp = num; num = den; den = temp; } void print0 { tout << num << '/' << den; } private: int num, den; 1;

A polygon is a closed plane figure bounded by straight line segments as sides. Thus, Fig. 1-27 is a polygon of five sides, called a pentagon; it is named pentagon ABCDE, using its letters in order.

In most cases, the preferred style is to define the member functions outside of the class declaration, using the scope resolution operator as shown in Example 8.1. That format physically separates the function declarations from their definitions, consistent with the general principle of information hiding. In fact, the definitions are often put in a separate file and compiled separately. The point is that application programs that use the class need only know what the objects can do; they do not need to know how the objects do it. The function declarations tell what they do; the function definitions tell how they do it. This of course is how the predefined types (int, double, etc.) work: we know what the result should be when we divide one float by another, but we don t really know how the division is done (i.e., what algorithm is implemented). More importantly, we don t want to know. Having to think about those details would distract us from the task at hand. This point of view is often called information hiding and is an important principle in object-oriented programming.

Fig. 1-27