interview_questions

using System;
using System.Text;

namespace types
{
    public class ValRefTypes
    {
        public ValRefTypes()
        {
            var i = 10;
            Console.WriteLine($"Before increment: {i}");
            Increment(i);
            Console.WriteLine($"After increment: {i}");

            var sb = new StringBuilder("How are you");
            Console.WriteLine($"Before append: {sb}");
            AddQuestionMark(sb);
            Console.WriteLine($"After append: {sb}");
        }

        public void Increment(int i)
        {
            i++;
        }

        public void AddQuestionMark(StringBuilder stringBuilder)
        {
            stringBuilder.Append("?");
        }

        public void AddQuestionMark2(StringBuilder stringBuilder)
        {
            stringBuilder = new StringBuilder("?");
        }
    }
}

namespace inheritance
{
    class Program
    {
        static void Main(string[] args)
        {
            Animal dog = new Dog();
            dog.Move();

            Animal cat = new Cat();
            cat.Move();
        }
    }

    public abstract class Animal
    {
        public virtual void Move()
        {
            Console.WriteLine("Animal is moving");
        }
    }

    public sealed class Dog : Animal
    {
        public override void Move()
        {
            Console.WriteLine("Dog is moving");
        }
    }

    public sealed class Cat : Animal
    {
        public new void Move()
        {
            Console.WriteLine("Cat is moving");
        }
    }
}