Modify the program as follows: a) Change the array for test scores (score[]) to

Question

Modify the program as follows:

a) Change the array for test scores (score[]) to dynamic array. Add a private member variable called number_of_scores to store how many tests a student took.

b) Modify the mutator function (setVars) to set the value for number_of_scores and test scores to integrate the dynamic array definition. Prompt the user for the value of number_of_scores.

c) Write a destructor function to clear the dynamic array for test scores.

d) Write a copy constructor function that creates a duplicate copy of a Student object.

e) In your main function, create a dynamic array of Student objects. Prompt the user for the size of the dynamic array.

f) Demonstrate the accessor and mutator functions for the Student object.

Code so far:

#include <iostream>
#include <string>
using namespace std;

class Student
{
public:
Student();
void setVars(long int new_id, string new_name, int new_score[], double new_average);
void getVars();
private:
long int id;
string name;
int score[4];
double average;
};

Student::Student()
{
}

void Student::setVars(long int new_id, string new_name, int new_score[], double new_average)
{
double total = 0.0;
cout << "Enter ID: ";
cin >> new_id;
cin.ignore();
cout << "Enter Name: ";
getline(cin, new_name);
cout << "Enter 5 test scores." << endl;;
for (int i = 0; i < 5; i++)
{
cout << "Test " << i+1 << ": ";
cin >> new_score[i];
score[i] = new_score[i];
total += new_score[i];
}

new_average = total/5;

id = new_id;
name = new_name;
average = new_average;
}

void Student::getVars()
{
cout << "ID: " << id << endl;
cout << "Name: " << name << endl;
for (int i = 0; i < 5; i++)
{
cout << "Test " << i+1 << ": " << score[i] << endl;
}
cout << "Average: " << average << endl;
}

int main()
{
long int new_id;
string new_name;
int new_score[4];
double new_average = 0;

cout << endl;

Student student[4];
for (int i = 0; i < 5; i++)
{
cout << "Student " << i+1 << endl;
student[i].setVars(new_id, new_name, new_score, new_average);
cout << endl;
cout << "Student " << i+1 << endl;
student[i].getVars();
cout << endl;
}

return 0;

Explanation / Answer

#include <iostream>
#include <string>
using namespace std;

class Student
{
        public:
                Student();
                void setVars(long int new_id, string new_name, int new_score[], double new_average);
                void getVars();
        private:
                long int id;
                string name;
                int *score;
                int number_of_scores;
                double average;
};

Student::Student()
{
}

Student::Student(Student other) {
   id = other.id;
        name = other.name;
   number_of_scores = other.number_of_scores;
        average = other.average;

   score = new int[number_of_score];
   for (int i = 0; i < number_of_score; i++)
       score[i] = other.score[i];
}

Student::~Student() {
   if (score != NULL)
       delete[] score;
}
void Student::setVars(long int new_id, string new_name, int *new_score, double new_average)
{
        double total = 0.0;
        cout << "Enter ID: ";
        cin >> new_id;
        cin.ignore();
        cout << "Enter Name: ";
        getline(cin, new_name);
        cout << "Enter number of test scores to consider:";
   cin >> number_of_scores;
   scores = new int[number_of_scores];
   new_score = new int[number_of_scores];
    cout << "Enter "<<number_of_scores<<" test scores." << endl;
        for (int i = 0; i < number_of_scores; i++)
        {
                cout << "Test " << i+1 << ": ";
                cin >> new_score[i];
                score[i] = new_score[i];
                total += new_score[i];
        }

        new_average = total/number_of_scores;

        id = new_id;
        name = new_name;
        average = new_average;
}

void Student::getVars()
{
        cout << "ID: " << id << endl;
        cout << "Name: " << name << endl;
        for (int i = 0; i < number_of_scores; i++)
        {
                cout << "Test " << i+1 << ": " << score[i] << endl;
        }
        cout << "Average: " << average << endl;
}

int main()
{
        long int new_id;
        string new_name;
        int *new_score;
        double new_average = 0;
   int number_of_students;
        cout << endl;
   cout << "Enter number of students: ";
   cin >> number_of_students;
        Student *student;
   student = new Student[number_of_students];
        for (int i = 0; i < number_of_students; i++)
        {
                cout << "Student " << i+1 << endl;
                student[i].setVars(new_id, new_name, new_score, new_average);
                cout << endl;
                cout << "Student " << i+1 << endl;
                student[i].getVars();
                cout << endl;
        }

        return 0;
}

I have edited the program to meet all your requirments. Parts in bold are are what I have edited.

As a guide I want to point out a logical error with the code:

Let me know if you need any help. Shall try my best to help you

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