EXP6_STRING

public class StudentRecordSystem
{
    private string[] studentNames;
    private int[] studentAges;
    private string[] deptNames;
    private int totalStudents;
    private const int MAX_STUDENTS = 100; // Maximum number of students

    public StudentRecordSystem()
    {
        studentNames = new string[MAX_STUDENTS];
        studentAges = new int[MAX_STUDENTS];
        deptNames = new string[MAX_STUDENTS];
        totalStudents = 0;
    }
    public void AddStudent(string name, int age, string gradeLevel)
    {
        if (totalStudents < MAX_STUDENTS)
        {
            studentNames[totalStudents] = name;
            studentAges[totalStudents] = age;
            deptNames[totalStudents] = gradeLevel;
            totalStudents++;
            Console.WriteLine("Student added successfully.");
        }
        else
        {
            Console.WriteLine("Maximum number of students reached.");
        }
    }
    public void UpdateStudent(string name, int age, string gradeLevel)
    {
        int index = FindStudentIndex(name);
        if (index != -1)
        {
            studentAges[index] = age;
            deptNames[index] = gradeLevel;
            Console.WriteLine("Student record updated successfully.");
        }
        else
        {
            Console.WriteLine("Student not found.");
        }
    }
    public void DeleteStudent(string name)
    {
        int index = FindStudentIndex(name);
        if (index != -1)
        {
            for (int i = index; i < totalStudents - 1; i++)
            {
                studentNames[i] = studentNames[i + 1];
                studentAges[i] = studentAges[i + 1];
                deptNames[i] = deptNames[i + 1];
            }
            totalStudents--;
            Console.WriteLine("Student record deleted successfully.");
        }
        else
        {
            Console.WriteLine("Student not found.");
        }
    }

    public void SearchStudent(string name)
    {
        int index = FindStudentIndex(name);
        if (index != -1)
        {
            Console.WriteLine("Name: {studentNames[index]}, Age: {studentAges[index]}, Grade Level: {studentGradeLevels[index]}");
        }
        else
        {
            Console.WriteLine("Student not found.");
        }
    }

    public string GetAllStudentsInfo()
    {
        if (totalStudents == 0)
        {
            return "No students found.";
        }
        string allStudentsInfo = "";
        for (int i = 0; i < totalStudents; i++)
        {
            allStudentsInfo += "Name:" + studentNames[i] + ", Age: " + studentAges[i] + ", department name: " + deptNames[i] + "\n";
        }
        return allStudentsInfo;
    }

    private int FindStudentIndex(string name)
    {
        for (int i = 0; i < totalStudents; i++)
        {
            if (studentNames[i] == name)
            {
                return i;
            }
        }
        return -1; // Student not found
    }
}

class Program
{
    static void Main(string[] args)
    {
        StudentRecordSystem recordSystem = new StudentRecordSystem();
        char choice;

        do
        {
            Console.WriteLine("\nMenu:");
            Console.WriteLine("1. Add Student");
            Console.WriteLine("2. Update Student");
            Console.WriteLine("3. Delete Student");
            Console.WriteLine("4. Search Student");
            Console.WriteLine("5. Display All Students");
            Console.WriteLine("6. Exit");
            Console.Write("Enter your choice: ");
            choice = Console.ReadKey().KeyChar;
            Console.WriteLine();

            switch (choice)
            {
                case '1':
                    Console.Write("Enter name: ");
                    string name = Console.ReadLine();
                    Console.Write("Enter age: ");
                    int age = int.Parse(Console.ReadLine());
                    Console.Write("Enter Department name: ");
                    string gradeLevel = Console.ReadLine();
                    recordSystem.AddStudent(name, age, gradeLevel);
                    break;
                case '2':
                    Console.Write("Enter name of student to update: ");
                    string nameUpdate = Console.ReadLine();
                    Console.Write("Enter age: ");
                    int ageUpdate = int.Parse(Console.ReadLine());
                    Console.Write("Enter Department name: ");
                    string gradeLevelUpdate = Console.ReadLine();
                    recordSystem.UpdateStudent(nameUpdate, ageUpdate, gradeLevelUpdate);
                    break;
                case '3':
                    Console.Write("Enter name of student to delete: ");
                    string nameDelete = Console.ReadLine();
                    recordSystem.DeleteStudent(nameDelete);
                    break;
                case '4':
                    Console.Write("Enter name of student to search: ");
                    string searchName = Console.ReadLine();
                    recordSystem.SearchStudent(searchName);
                    break;
                case '5':
                    Console.WriteLine("All Students:");
                    Console.WriteLine(recordSystem.GetAllStudentsInfo());
                    break;
                case '6':
                    Console.WriteLine("Exiting...");
                    break;
                default:
                    Console.WriteLine("Invalid choice. Please enter a valid option.");
                    break;
            }
        } while (choice != '6');
    }
}