C#_OOP_Abstraction_Encapsulation_Polymorphism_Human.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace App2b
{
    class Human : Introducable
    {
        protected string name;
        protected int age;
        private double temp;
        private string[] friends = new string[5];
        public static int counter = 0;
        private static string nationality = "Bugarian";
        public const double PI = 3.14;
        public static readonly double onlyRead = 5.4;
        private string info;

        // public enum BrainSize {
        //    small = 1350, middle = 1400, large = 1450
        // };

        public static string Nationality
        {
            get { return nationality; }
            set { nationality = value; }
        }

        public string Name
        {
            get { return name; }
            set { name = value; }
        }

        public int Age
        {
            get { return age; }
            set { age = value; }
        }

        public double Balance
        {
            get {return name.Length * 2 * 2;}
        }

        static Human() // a static constructor must be parametreess
        {
            onlyRead = 2.71;
        }

        public Human()
            : this("Default", 0)
        {
            // this.name = "Default";
            // this.age = 0;
        }

        public Human(string name, int age)
        {
            this.name = name;
            this.age = age;
            counter++;
            // onlyRead = 2.71; // non static
        }

        public Human(int age, string name, params string[] friends)
            : this(name, age)
        {
            // this.name = name;
            // this.age = age;
            int i = 0;
            foreach (string friend in friends)
            {
                this.friends[i] = friend;
                i++;
            }
        }

        public virtual void IntroduceYourSelf()
        {
            Console.WriteLine("My name is {0}. I am {1} years old! My Balance is {2}. My nationality is {3}. And I am {4}", name, age, Balance, nationality, GetMyFeelings());
        }

        public void IntroduceYourSelf(string verbous)
        {
            IntroduceYourSelf();
            Console.WriteLine("I am {0}", verbous);
        }

        public string GetFriendName(int index)
        {
            return friends[index];
        }

        public static double CalculateNationlIncome()
        {
            return counter * 10000;
        }

        public void Listen(string info)
        {
            this.info = info;
        }

        public string Talk()
        {
            return info;
        }

        private string GetMyFeelings()
        {
            if (age > 50) {
                return "sad";
            }
            return "happy";
        }

        // public abstract void Run();

        /*
        public string GetName()
        {
            return name;
        }

        public void SetName(string name)
        {
            this.name = name;
        }

        public int GetAge()
        {
            return age;
        }

        public void SetAge(int age)
        {
            this.age = age;
        }
        */
    }
}