C++ Record 4

 #include <iostream>

#include <string>
#include <algorithm> // Required for std::sort

// Define the struct
struct Student {
    int student_id;
    std::string name_id;
};

// Helper function to compare two students by their ID (for sorting)
bool compareById(const Student& a, const Student& b) {
    return a.student_id < b.student_id;
}

int main() {
    const int MAX_STUDENTS = 5;      // Changed limit to 5 students
    Student students[MAX_STUDENTS];  // Fixed-size array
    int actual_count = 0;

    std::cout << "--- Enter Student Details (Max " << MAX_STUDENTS << ") ---\n";
    std::cout << "Enter a negative ID to stop early.\n\n";

    // 1. Input Loop (cin)
    for (int i = 0; i < MAX_STUDENTS; ++i) {
        std::cout << "Enter ID for student " << (i + 1) << ": ";
        std::cin >> students[i].student_id;

        if (students[i].student_id < 0) {
            break;
        }

        std::cin.ignore(); // Clear newline buffer before getline

        std::cout << "Enter Name for student " << (i + 1) << ": ";
        std::getline(std::cin, students[i].name_id);
        
        std::cout << "\n";
        actual_count++;
    }

    // 2. Sorting Step
    // std::sort needs the beginning of the array and the end of the populated elements
    std::sort(students, students + actual_count, compareById);

    // 3. View Results Loop (cout)
    std::cout << "===================================\n";
    std::cout << "    SORTED RESULTS (BY ID ASC)     \n";
    std::cout << "===================================\n";
    
    if (actual_count == 0) {
        std::cout << "No student records to display.\n";
    } else {
        for (int i = 0; i < actual_count; ++i) {
            std::cout << "ID: " << students[i].student_id 
                      << " | Name: " << students[i].name_id << "\n";
        }
    }
    std::cout << "===================================\n";

    return 0;
}