Question

In C++

Write a program that dynamically allocates a built-in array large enough to hold a user-defined number of test scores. (Ask the user how many grades will be entered and use a dynamic array to store the numbers.) Once all the scores are entered, the array should be passed to a function that calculates the average score. The program should display the scores and average. Use pointer notation rather than array notation whenever possible. (Input Validation: Do not accept negative numbers for test scores.) Make it a class, call it something like gradeholder. You will need a destructor because you are using dynamic arrays.

I need your help. Thank you

Answer 1

#include <iostream>

using namespace std;

// function to calculate average of the scores

double calAverage(double *ptr, int size) {

    // initialize sum to 0

    double sum = 0.0;

    // calculate sum

    for(int i = 0; i < size; i++) {

        sum += *(ptr + i);

    }

    // return the average

    return sum/size;

}

// main function

int main() {

    // declare variable

    int n;

    // read the number of scores in array

    cout << "Number of test scores: ";

    cin >> n;

    // dynamically allocate the array to store scores

    double *scores = new double[n];

    for(int i = 0; i < n; i++){

        // read scores

        cout << "Enter score " << i + 1 << ": ";

        cin >> *(scores + i);

        // validating user input

        while (*(scores + i) < 0){

            cout << "Test score can not be negative."<<endl;

            cout << "Please re-enter: "<<endl;

            cin >> *(scores + i);

        }

    }

    // display scores

    cout << "\n\nTest Scores: ";

    for(int i = 0; i < n; i++){

        cout << *(scores + i) << " ";

    }

    // call function to calculate average

    cout << "\nAverage: ";

    cout << calAverage(scores, n);  // function call to calculate average

    

    // delete the array free its memory

    delete[] scores;

    return 0;

}