Question

Help with C++ please

Create a class called ClassQuiz. ClassQuiz will maintain quiz grades for students in a class.

The class has the following member variables:
int numStudents // holds the number of students in the class
double* grades // to point to a dynamically allocated array of grades

The class has the following public functions:
+default constructors //set numStudents = 0; and grades = nullptr;
+parameterized constructors //accepts numStudents and creates an array with size = numStudents;
+AcceptGrades // accept grades from end user using cin and stores them in grades array.
+CalculateAverage //calculate and returns the average of the class.
+Destructor to free the dynamically allocated array.
+Any setters/getters needed. Note that a setter for the numStudents should also initialize grades array.

Main:
Create an object of the ClassQuiz class.
Call AcceptGrades to accept grades from user.
Call CalculateAverage to calculate the average of the class.
Print the class average.

Answer 1

Thanks for the question, here is the complete code in C++. I have used a do while loop to keep on asking the user if he wants t oadd a new grade or not and finally it will display the average grades.

thanks a lot, let me know for any help with any other questions, and please do give a thumbs up : )

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#include <iostream>

using namespace std;

class ClassQuiz{

                private:

                                int numStudent;

                                double* grades;

                                int count;

                public:

                                ClassQuiz();

                                ClassQuiz(int);

                                void AcceptGrades();

                                double CalculateAverage();

                                ~ClassQuiz();

                                void setNumberOfStudent(int);

};

ClassQuiz::ClassQuiz(): numStudent(0), grades(NULL){count=0;}

ClassQuiz::ClassQuiz(int num) :numStudent(num), grades(new double[num]), count(0){}

void ClassQuiz::AcceptGrades(){

                if(count<numStudent){

                                cout<<"Enter grade: "; cin >> *(grades+count++);

                }else{

                                cout<<"Max grade reached, no more space available\n";

                }

}

double ClassQuiz::CalculateAverage(){

                double total =0;

                for(int i=0; i<count;i++) total+= *(grades+i);

                if(count!=0) return total/count;

                else return 0.0;

}

ClassQuiz::~ClassQuiz(){

                delete[] grades;

}

void ClassQuiz::setNumberOfStudent(int num){

                delete[] grades;

                numStudent = num;

                grades = new double[numStudent];

}

int main(){

               

               

                int num;

                cout<<"Enter number of students: " ; cin >> num;

               

                ClassQuiz quiz(num);

                cout<<"Class Average: "<<quiz.CalculateAverage() << endl;

                char repeat ;

                do{

                                quiz.AcceptGrades();

                                cout<<"Do you want to enter another grade (y/n): " ; cin >> repeat; cin.ignore(256,'\n');

                               

                }while(repeat=='y');

               

                cout<<"Class Average: "<<quiz.CalculateAverage() << endl;

               

}

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