Answer to Question #349995 in C++ for Babu

Question

Write a program to calculate students’ average test scores and their grades. You may assume the following input data:

Nondo 85 83 77 91 76

Djiara 80 90 95 93 48

Anna 78 81 11 90 73

Salum 92 83 30 69 87

Moloko 23 45 96 38 59

Job 60 85 45 39 67

Feisal 77 31 52 74 83

Kibwana 93 94 89 77 97

Shomari 79 85 28 93 82

Mayele 85 72 49 75 63

Use three arrays: a one-dimensional array to store the students’ names, a (parallel) two-dimensional array to store the test scores, and a parallel one-dimensional array to store grades. Your program must contain at least the following features: read and store data into two arrays, calculate the average test score and grade, and output the results. Have your program also output the class average.

Answer 1

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

constexpr auto numOfTESTS = 5;

int addStudents(string* names, int (&scores)[100][numOfTESTS], int& numOfstudents);

int main(int argc, char* argv[]) {
    string names[100];
    int scores[100][numOfTESTS]{};
    int averages[100]{};
    char grades[100];
    int class_average = 0, numOfstudents = 0;

    if (argc > 1) {
        for (int i = 0; i < (argc-1)/6; i++) {
            names[i] = argv[i * 6 + 1];
            for (int j = 0; j < 5; j++) {
                scores[i][j] = stoi(argv[i * 6 + j + 2]);
            }
            numOfstudents++;
        }
    } else {
        addStudents(names, scores, numOfstudents);
    }

    for (int i = 0; i < numOfstudents; i++) {
        averages[i] = (scores[i][0] + scores[i][1] + scores[i][2] + scores[i][3] + scores[i][4]) / 5;
        class_average += averages[i];

        if (averages[i] > 89) {
            grades[i] = 'A';
        } else if (averages[i] > 79) {
            grades[i] = 'B';
        } else if (averages[i] > 69) {
            grades[i] = 'C';
        } else if (averages[i] > 59) {
            grades[i] = 'D';
        } else {
            grades[i] = 'F';
        }

        cout << "Student name: " << names[i] << "\n";
        cout << "Scores: " << scores[i][0] << " " << scores[i][1] << " " << scores[i][2] << " " << scores[i][3] << " " << scores[i][4] << "\n";
        cout << "Average score: " << averages[i] << "\n";
        cout << "Grade: " << grades[i] << "\n\n";
    }
    class_average /= numOfstudents;
    cout << "Class average score: " << class_average << endl;

    return 0;
}

int addStudents(string* names, int(&scores)[100][numOfTESTS], int& numOfstudents) {
    vector<string> students;
    string data, more = "No";
    do {
        cout << "Enter sudent name and scores: \n";
        getline(cin, data);
        students.push_back(data);
        cout << "Do you want add one more student? (Type \"Yes\" for add one more) ";
        getline(cin, more);
        numOfstudents++;
    } while (more == "Yes" || more == "yes" || more == "YES");
    cout << endl;
    for (int i = 0; i < students.size(); i++) {
        size_t start = 0, end = students[i].find(" ");
        names[i] = students[i].substr(start, end);
        for (int j = 0; j < numOfTESTS; j++) {
            scores[i][j] = 0;
        }
        for (int j = 0; j < numOfTESTS; j++) {
            start = end + 1;
            end = students[i].find(" ", end + 1);
            scores[i][j] = stoi(students[i].substr(start, end));
        }
    }
    return numOfstudents;
}