OOPPrinciplesStatic2аPerson

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

namespace World2a
{
    class Person : IIntroducable // : Object
    {
       // private string _sfgsdhsdjh;
        protected string name;
        protected int age;
        private double temp;
        private string[] friends = new string[5];
        private static int counter = 0;
        protected static string nationality = "Bulgarian";
        public const double PI = 3.14;
        public static readonly double onlyRead = 5.4;

        static Person()
        {
            nationality = "Albanian";
        }
        public static int Counter
        {
            get { return counter; }
            // private set { counter = value; }
        }

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

        // Indexer
        public string this[int i] {
            get { return friends[i]; }
            set { friends[i] = value; }
        }
        public string Name
        {
            get { return name; }
            set { name = value; }
        }

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

        public double Balance
        {
            get { return (double)age * 3.14; }
        }

        public Person()
            : this("Default", 0)
        {
            // Name = "Default";
            // Age = 0;
        }
        /*
        public Person(int age, string name)
        {
            Name = name;
            Age = age;
            // this.name = name;
            // this.age = age;
        }
        */
        public Person(string name, int age, double balance = 0.0, params string[] friends)
        {
            Name = name;
            Age = age;
            // this.name = name;
            // this.age = age;
            int i = 0;
            foreach(string friend in friends) {
                this.friends[i] = friend;
                i++;
            }
            counter++;
            // onlyRead = age * 2.7;
        }

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

        public static double GetNationalIncome()
        {
            return counter * 1234.45;
        }

        /*
        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;
        }
        */
    }
}