simple console-based C++ program for a student management system.

This example allows you to add students, display their details, and search for a student by their ID.

#include <iostream>
#include <vector>

class Student {
public:
    std::string name;
    int id;
    int age;

    // Constructor
    Student(const std::string& n, int i, int a) : name(n), id(i), age(a) {}

    // Display student details
    void displayDetails() const {
        std::cout << "ID: " << id << "\nName: " << name << "\nAge: " << age << "\n\n";
    }
};

class StudentManagementSystem {
private:
    std::vector<Student> students;

public:
    // Add a new student
    void addStudent(const std::string& name, int id, int age) {
        students.emplace_back(name, id, age);
    }

    // Display all students
    void displayAllStudents() const {
        std::cout << "=== All Students ===\n";
        for (const auto& student : students) {
            student.displayDetails();
        }
    }

    // Search for a student by ID
    void searchStudentById(int id) const {
        auto it = std::find_if(students.begin(), students.end(), [id](const Student& student) {
            return student.id == id;
        });

        if (it != students.end()) {
            std::cout << "Student found:\n";
            it->displayDetails();
        } else {
            std::cout << "Student not found.\n";
        }
    }
};

int main() {
    StudentManagementSystem system;

    int choice;
    do {
        std::cout << "Student Management System\n";
        std::cout << "1. Add Student\n";
        std::cout << "2. Display All Students\n";
        std::cout << "3. Search Student by ID\n";
        std::cout << "0. Exit\n";
        std::cout << "Enter your choice: ";
        std::cin >> choice;

        switch (choice) {
            case 1: {
                std::string name;
                int id, age;

                std::cout << "Enter student ID: ";
                std::cin >> id;

                std::cout << "Enter student name: ";
                std::cin.ignore();  // Ignore the newline character from previous input
                std::getline(std::cin, name);

                std::cout << "Enter student age: ";
                std::cin >> age;

                system.addStudent(name, id, age);
                std::cout << "Student added successfully.\n\n";
                break;
            }
            case 2:
                system.displayAllStudents();
                break;
            case 3: {
                int searchId;
                std::cout << "Enter student ID to search: ";
                std::cin >> searchId;
                system.searchStudentById(searchId);
                break;
            }
            case 0:
                std::cout << "Exiting program.\n";
                break;
            default:
                std::cout << "Invalid choice. Please try again.\n";
        }

    } while (choice != 0);

    return 0;
}