Question

Objectives:

 Write classes in C++

 Use dynamic arrays

 Write and read from files

1. WriteaclassGradeBookcontainingthefollowing: Private attributes:

- courseName: a string representing the name of the course.

- nbOfStudents: an integer representing the number of students enrolled in the course. The

number of students is greater than or equal to 5.

- grades: a double dimensional array of integers representing the grades of Test1, Test2 and

Final of every student. It should be a dynamic array. Public Functions:

- A no-arg constructor that initializes the nbStudent to 5, the courseName to empty string and the array grades to an array of 5 rows and 3 columns. This constructor should call the setGradeBook function.

- A constructor that takes as parameters the number of students, the course name and the array grades and sets the corresponding values by calling setGradeBook.

- A copy constructor that takes an object of class GradeBook and copies the data to the instantiated object.

- A destructor that deletes the array grades.

- setGradeBook that takes all parameters and sets the attributes values.

- getMaximum that returns the highest grade in the array grades.

- getAverage that takes a one dimensional array representing the three grades of a student, one row in the array grades, and returns the average of the student.

- display function that takes an ostream and returns the following output:

Answer 1

I have implemented GradeBook class as per the given description.

PLEASE FIND THE FOLLOWING CODE SCREENSHOT, OUTPUT, AND CODE.

ANY CLARIFICATIONS REQUIRED LEAVE A COMMENT

1.CODE SCREENSHOT:

2.OUTPUT:

3.CODE:

#include<iostream>
#include<stdlib.h>
#include<time.h>
#include<iomanip>
#include<fstream>
using namespace std;
class GradeBook{
        private:
        //VARIABLES TO STORE THE courseName,nbOfStudents,grades
        string courseName;
        int nbOfStudents;
        double **grades;
        public:
        /* A no-arg constructor that initializes the nbStudent to 5, 
        the courseName to empty string and the array grades to an 
        array of 5 rows and 3 columns.
        */
        GradeBook(){
                courseName="";
                nbOfStudents=5;
                grades=new double*[nbOfStudents];
                for(int i=0;i<nbOfStudents;i++)
                        grades[i]=new double[3];
        }
        /*A constructor that takes as parameters the number of students, 
        the course name and the array grades and sets the corresponding 
        values by calling setGradeBook
        */
        GradeBook(int nofSt,string name,double **g){
                courseName=name;
                nbOfStudents=nofSt;
                grades=new double*[nbOfStudents];
                for(int i=0;i<nbOfStudents;i++)
                        grades[i]=new double[3];
                setGradeBook(g);
        
        }
        /*A copy constructor that takes an object of class GradeBook and copies the data to the instantiated object.*/
        GradeBook(const GradeBook &g){
                courseName=g.courseName;
                nbOfStudents=g.nbOfStudents;
                grades=new double*[nbOfStudents];
                for(int i=0;i<nbOfStudents;i++)
                        grades[i]=new double[3];
                setGradeBook(g.grades);
                
        }
        // destructor that deletes the array grades.
        ~GradeBook(){
                delete[] grades;
        }
        //- setGradeBook that takes all parameters and sets the attributes values.
        void setGradeBook(double **g){
                int i=0,j=0;
                for(i=0;i<nbOfStudents;i++)
                        for(j=0;j<3;j++)
                                grades[i][j]=g[i][j];
        }
        //- getMaximum that returns the highest grade in the array grades.
        double getAverage(double *g){
                return (g[0]+g[1]+g[2])/3;
        }
        /*- getAverage that takes a one dimensional array 
        representing the three grades of a student, one row in the array grades, 
        and returns the average of the student.*/
        double getMaximum(double **g){
                int i=0,j=0;
                double max=0;
                for(i=0;i<nbOfStudents;i++)
                        for(j=0;j<3;j++)
                        {
                                if(grades[i][j]>max)
                                        max=grades[i][j];
                        }
                return max;
        }
        //display the result ot the require stream
        void display(ostream &out){
                out<<"The Grade Book"<<endl<<"Course Name : "<<courseName<<endl<<"Number Of Studnets : "<<nbOfStudents<<endl;
                out<<setw(8)<<left<<"Test 1"<<setw(8)<<"Test 2"<<setw(8)<<"Final"<<setw(8)<<"Agerage"<<endl;
                for(int i=0;i<nbOfStudents;i++){
                        
                        for(int j=0;j<3;j++)
                        {
                                out<<setw(8)<<grades[i][j];
                        }
                        out<<setw(8)<<setprecision(4)<<getAverage(grades[i]);
                        out<<endl;
                }
                out<<"Maximum Grade is :"<<getMaximum(grades);
        }
};
int main(){
        double **grades;
        ofstream out("output.txt");
        grades=new double*[5];
        srand(time(0));
        //generate random grades
        for(int i=0;i<5;i++)
                grades[i]=new double[3];
        for(int i=0;i<5;i++)
                for(int j=0;j<3;j++)
                        grades[i][j]=40+rand()%60;
        //create the grade book
        GradeBook g(5,"CPP",grades);
        //display the output
        g.display(cout);
        //save the output to a file
        g.display(out);
        cout<<"\nThis Output is saved into a file 'output.txt'";
}