Program Student Management System dengan C++

#include <iostream>
#include <string>
#include <vector>

struct Student {
    int id;
    std::string name;
    std::string grade;
    std::string dateOfBirth;
    std::string address;
    std::vector<int> scores;
};

std::vector<Student> students;

void addStudent() {
    Student student;
    std::cout << "Masukkan ID Siswa: ";
    std::cin >> student.id;
    std::cout << "Masukkan Nama Siswa: ";
    std::cin.ignore();
    std::getline(std::cin, student.name);
    std::cout << "Masukkan Kelas Siswa: ";
    std::getline(std::cin, student.grade);
    std::cout << "Masukkan Tanggal Lahir Siswa: ";
    std::getline(std::cin, student.dateOfBirth);
    std::cout << "Masukkan Alamat Siswa: ";
    std::getline(std::cin, student.address);

    students.push_back(student);
    std::cout << "Data siswa berhasil ditambahkan!" << std::endl;
}

void searchStudent() {
    int id;
    std::cout << "Masukkan ID Siswa yang ingin dicari: ";
    std::cin >> id;

    for (const auto& student : students) {
        if (student.id == id) {
            std::cout << "ID Siswa: " << student.id << std::endl;
            std::cout << "Nama Siswa: " << student.name << std::endl;
            std::cout << "Kelas Siswa: " << student.grade << std::endl;
            std::cout << "Tanggal Lahir Siswa: " << student.dateOfBirth << std::endl;
            std::cout << "Alamat Siswa: " << student.address << std::endl;
            return;
        }
    }

    std::cout << "Data siswa tidak ditemukan!" << std::endl;
}

void updateStudent() {
    int id;
    std::cout << "Masukkan ID Siswa yang ingin diubah: ";
    std::cin >> id;

    for (auto& student : students) {
        if (student.id == id) {
            std::cout << "Masukkan Nama Siswa Baru: ";
            std::cin.ignore();
            std::getline(std::cin, student.name);
            std::cout << "Masukkan Kelas Siswa Baru: ";
            std::getline(std::cin, student.grade);
            std::cout << "Masukkan Tanggal Lahir Siswa Baru: ";
            std::getline(std::cin, student.dateOfBirth);
            std::cout << "Masukkan Alamat Siswa Baru: ";
            std::getline(std::cin, student.address);
            std::cout << "Data siswa berhasil diubah!" << std::endl;
            return;
        }
    }

    std::cout << "Data siswa tidak ditemukan!" << std::endl;
}

void addScores() {
    int id;
    std::cout << "Masukkan ID Siswa yang ingin ditambahkan nilai: ";
    std::cin >> id;

    for (auto& student : students) {
        if (student.id == id) {
            int mtk, pkn, inggris;
            std::cout << "Masukkan Nilai Matematika: ";
            std::cin >> mtk;
            std::cout << "Masukkan Nilai PKN: ";
            std::cin >> pkn;
            std::cout << "Masukkan Nilai Bahasa Inggris: ";
            std::cin >> inggris;

            student.scores.push_back(mtk);
            student.scores.push_back(pkn);
            student.scores.push_back(inggris);

            int totalScore = mtk + pkn + inggris;
            if (totalScore >= 80) {
                student.grade = "A";
            } else if (totalScore >= 70) {
                student.grade = "B";
            } else if (totalScore >= 60) {
                student.grade = "C";
            } else {
                student.grade = "D";
            }

            std::cout << "Nilai siswa berhasil ditambahkan!" << std::endl;
            return;
        }
    }

    std::cout << "Data siswa tidak ditemukan!" << std::endl;
}

void displayStudents() {
    for (const auto& student : students) {
        std::cout << "ID Siswa: " << student.id << std::endl;
        std::cout << "Nama Siswa: " << student.name << std::endl;
        std::cout << "Kelas Siswa: " << student.grade << std::endl;
        std::cout << "Tanggal Lahir Siswa: " << student.dateOfBirth << std::endl;
        std::cout << "Alamat Siswa: " << student.address << std::endl;
        std::cout << "Nilai Siswa: ";
        for (const auto& score : student.scores) {
            std::cout << score << " ";
        }
        std::cout << std::endl;
        std::cout << "Grade Siswa: " << student.grade << std::endl;
        std::cout << std::endl;
    }
}

int main() {
    int choice;

    do {
        std::cout << "=== Student Management System ===" << std::endl;
        std::cout << "1. Tambah Data Siswa" << std::endl;
        std::cout << "2. Cari Data Siswa" << std::endl;
        std::cout << "3. Ubah Data Siswa" << std::endl;
        std::cout << "4. Tambah Nilai Siswa" << std::endl;
        std::cout << "5. Tampilkan Data Siswa" << std::endl;
        std::cout << "6. Keluar" << std::endl;
        std::cout << "Pilih menu: ";
        std::cin >> choice;

        switch (choice) {
            case 1:
                addStudent();
                break;
            case 2:
                searchStudent();
                break;
            case 3:
                updateStudent();
                break;
            case 4:
                addScores();
                break;
            case 5:
                displayStudents();
                break;
            case 6:
                std::cout << "Terima kasih!" << std::endl;
                break;
            default:
                std::cout << "Pilihan tidak valid!" << std::endl;
                break;
        }

        std::cout << std::endl;
    } while (choice != 6);

    return 0;
}