Manage Student Records using an Array of Objects || eBook - C++ Lab Programs Collection

 Pgm Description:: Define a STUDENT class to store a student's USN, name, and marks for three tests. The program creates an array of 10 student objects, calculates the average of each student's two best marks, and displays their final records.

Pgm Details: This program utilizes an array of objects, which allows managing multiple student records under a single class structure. The logic specifically identifies and excludes the lowest test score to reward student performance.

Pgm Logic:

1. Start.

2. Define a class STUDENT with private members: USN, Name, Marks, and average_marks.

3. Define public member function setData() to accept USN, name, and three test marks from the user.

4. Define calculateAverage():

• Find the minimum of the three marks.

• Calculate the average using the formula: (sum of all marks - lowest mark) / 2.

5. Define displayData() to output the USN, Name, and calculated average.

6. In main(), declare an array of 10 STUDENT objects.

7. Use a loop to call setData() for each student.

8. Use a second loop to display the results for all students.

9. Stop.

Program Code:

// C++ program to manage student records and calculate average of best two marks

#include <iostream>

#include <string>

using namespace std;

class STUDENT {

private:

    char USN;

    char Name;

    float Marks;

    float average;

public:

    void setData() {

        cout << "Enter USN: ";

        cin >> USN;

        cout << "Enter Name: ";

        cin.ignore();

        cin.getline(Name, 30);

        cout << "Enter Marks in 3 tests: ";

        for (int i = 0; i < 3; i++) {

            cin >> Marks[i];

        }

    }

    void calculateAverage() {

        float low = Marks;

        if (Marks < low) low = Marks;

        if (Marks < low) low = Marks;

        average = (Marks + Marks + Marks - low) / 2.0;

    }

    void displayData() {

        cout << USN << "\t" << Name << "\t\t" << average << endl;

    }

};

int main() {

    STUDENT students;

    int n;

    cout << "Enter the number of students: ";

    cin >> n;

    for (int i = 0; i < n; i++) {

        cout << "\nEnter details for Student " << i + 1 << ":\n";

        students[i].setData();

        students[i].calculateAverage();

    }

    cout << "\nUSN\t\tNAME\t\tAVERAGE MARKS\n";

    cout << "--------------------------------------------\n";

    for (int i = 0; i < n; i++) {

        students[i].displayData();

    }

    return 0;

}

Output:

Enter the number of students: 2

Enter details for Student 1:

Enter USN: 2KD22EC001

Enter Name: ABHISHEK C

Enter Marks in 3 tests: 12 13 14

Enter details for Student 2:

Enter USN: 2KD22EC009

Enter Name: ANISHA

Enter Marks in 3 tests: 13 17 15

USN             NAME            AVERAGE MARKS

--------------------------------------------

2KD22EC001      ABHISHEK C      13.5

2KD22EC009      ANISHA          16

RESULT: Thus the program has been executed and the output was verified.

Remarks: For large inputs, using cin.ignore() before getline() is crucial to prevent the program from skipping name entries. This can be compiled and run in Code::Blocks or Visual Studio Code.

Program Explanation: The program uses a class to bundle data (USN, Name, Marks) with the logic to process it. By using an array of objects, the code can efficiently handle multiple records in a systematic way.

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