Mini Project: Student Manager - Part 2

Let's Think About This For a Second

In Part 1, we finished the Student class and the menu skeleton. In Part 2, we'll implement the actual features — adding a new student, displaying the whole student list, and searching for a student by roll number. We'll pass functions the vector<Student>& as a reference parameter, so the vector can be modified directly without copying — a practical way to put the reference topic to use. We'll also use loops and string comparison for the search feature.

Let's Build It

Build the addStudent(vector<Student>& students) function to read name, roll, and marks from the user with cin, then add them to the vector with push_back(). In displayAll(const vector<Student>& students), use a range-based for loop to print each student's name, roll, and marks. In searchByRoll(const vector<Student>& students, int roll), loop through to find the student with the matching roll number — show the details if found, or "Not found" if not. Wire up cases 1 and 2 in main()'s switch statement to call these functions, and add case 4 for Search By Roll as a new menu item.

• addStudent() can add a new student to the vector with push_back()
• displayAll() can print out the whole student list with a range-based for loop
• searchByRoll() can find and display a student by roll number

Example Code

void addStudent(vector<Student>& students) {
    string name;
    int roll;
    double marks;

    cout << "Enter name: ";
    cin >> name;
    cout << "Enter roll: ";
    cin >> roll;
    cout << "Enter marks: ";
    cin >> marks;

    students.push_back(Student(name, roll, marks));
    cout << "Student added!\n";
}

void displayAll(const vector<Student>& students) {
    if (students.empty()) {
        cout << "No students yet.\n";
        return;
    }
    for (const Student& s : students) {
        cout << s.getRoll() << " - " << s.getName()
             << " - Marks: " << s.getMarks() << "\n";
    }
}

void searchByRoll(const vector<Student>& students, int roll) {
    for (const Student& s : students) {
        if (s.getRoll() == roll) {
            cout << "Found: " << s.getName()
                 << " - Marks: " << s.getMarks() << "\n";
            return;
        }
    }
    cout << "Student not found.\n";
}

// main() ရဲ့ switch ထဲမှာ:
// case 1: addStudent(students); break;
// case 2: displayAll(students); break;
// case 4: { int r; cin >> r; searchByRoll(students, r); break; }

Choosing Add Student from the menu and entering data shows "Student added!", and choosing Display All shows the full student list in roll - name - marks format.