using System;

​

// Define the base class Person

class Person

{

    // Properties

    public string Name { get; set; }

    public int Age { get; set; }

    public string Address{get; set;}

    public Person(string Name, int Age, string Address){

        this.Name = Name;

        this.Age = Age;

        this.Address = Address;

    }

​

    // Methods

    public virtual void DisplayInfo()

    {

        Console.WriteLine($"Name: {Name}, Age: {Age}");

    }

}

​

​

​

// Define the derived class Student

class Student : Person

{

    // Additional properties for Student

    public int GradeLevel { get; set; }

​

    // Constructor for Student

    public Student(string Name, int Age,string Address, int GradeLevel) : base(Name, Age,Address)

    {

        this.GradeLevel = GradeLevel;

    }

​

    // Methods specific to Student

    public void Study()

    {

        Console.WriteLine($"{Name} is studying.");

    }

​

    // Override the DisplayInfo method

    public override void DisplayInfo()

    {

        base.DisplayInfo(); // Call the DisplayInfo method of the base class

        Console.WriteLine($"Grade Level: {GradeLevel}");

    }

}

​

public interface EmployeeDetails{

    void WorkingTenureInMonths(int months);

    void SalaryDetails(int amount);

}

​

// Define the derived class Teacher

class Teacher : Person, EmployeeDetails

{

    // Additional properties for Teacher

    public string Subject { get; set; }

    public int YearsOfExperience{get; set;}

    public Teacher(string Name, int Age,string Address, string Subject): base(Name,Age,Address){

        this.Subject = Subject;

    }

    // Methods specific to Teacher

    public void Teach()

    {

        Console.WriteLine($"{Name} is teaching {Subject}.");

    }

    public void WorkingTenureInMonths(int months)

    {

        if (months > 0)

        {

            int years = months / 12;

            int remainingMonths = months % 12;

​

            if (years > 0)

            {

                Console.Write($"The working tenure of {Name} is {years} year");

                if (years > 1)

                {

                    Console.Write("s");

                }

​

                if (remainingMonths > 0)

                {

                    Console.Write($" and {remainingMonths} month");

                    if (remainingMonths > 1)

                    {

                        Console.Write("s");

                    }

                }

                else

                {

                    Console.WriteLine(".");

                }

            }

            else

            {

                Console.WriteLine($"The working tenure is {months} month");

                if (months > 1)

                {

                    Console.Write("s");

                }

            }

        }

        else

        {

            Console.WriteLine($"Invalid input for months.");

        }

    }

​

    public void SalaryDetails(int amount){

        Console.WriteLine($"The salary of {Name} is {amount}");

    }

}

​

// Main program

class Program

{

    static void Main()

    {

        // Instantiate objects and demonstrate functionality

        Student student1 = new Student("Delish",22,"USA",14);

​

        Teacher teacher1 = new Teacher("Mr. Smith",35,"Toronto","Maths");

​

        // Display information and perform actions

        student1.DisplayInfo();

        student1.Study();

​

        teacher1.DisplayInfo();

        teacher1.Teach();

        teacher1.WorkingTenureInMonths(26);

    }

}