3.2. Defining a Class with a Member Function

We begin with an example (Fig. 3.1) that consists of class GradeBook (lines 8–16)—which, when it’s fully developed in Chapter 7, will represent a grade book that an instructor can use to maintain student test scores—and a main function (lines 19–23) that creates a GradeBook object. Function main uses this object and its displayMessage member function (lines 12–15) to display a message on the screen welcoming the instructor to the grade-book program.

Click here to view code image

 1   // Fig. 3.1: fig03_01.cpp
 2   // Define class GradeBook with a member function displayMessage,
 3   // create a GradeBook object, and call its displayMessage function.
 4   #include <iostream>
 5   using namespace std;
 6
 7   // GradeBook class definition                                       
 8   class GradeBook                                                     
 9   {                                                                   
10   public:                                                             
11      // function that displays a welcome message to the GradeBook user
12      void displayMessage() const                                      
13      {                                                                
14         cout << "Welcome to the Grade Book!" << endl;                 
15      } // end function displayMessage                                 
16   }; // end class GradeBook                                           
17
18   // function main begins program execution
19   int main()
20   {
21      GradeBook myGradeBook; // create a GradeBook object named myGradeBook 
22      myGradeBook.displayMessage(); // call object's displayMessage function
23   } // end main

Welcome to the Grade Book!

Fig. 3.1. Define class GradeBook with a member function displayMessage, create a GradeBook object and call its displayMessage function.

..................Content has been hidden....................

You can't read the all page of ebook, please click here login for view all page.
Reset
18.221.206.73