GradeBook.h

#include <cstdlib>
#include <iostream>
 
using namespace std;
 
class GradeBook{
      public:
             //displays given course number
             void displayMessage(int no);
 
             //displays the course number which is set by setCourseNo
             void displayMessage();
 
             //sets the course number
             void setCourseNo(int no);
 
             //ordinary get method
             int getCourseNo();
 
             // determines the average of grades entered by the user
	     // until a negative grade is entered
             double determineCourseAverage();
 
      private:
              int courseNo;
};