C#_OOP_1a_Program.cs

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

namespace App1a
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine(Human.PI);
            Console.WriteLine(Human.onlyRead);
            // int counter = 0;
            Human person1 = new Human("Stoyan", 50);
            // Console.WriteLine(person1.onlyRead);

            // counter++;
            Human person2 = new Human(20, "Ivan", "Petko", "Nikola");
            // counter++;
            Human person3 = new Human();
            // counter++;

            Human.Nationality = "German";

//            Console.WriteLine("My anme is {0}. I am {1} years old!", person1.Name, person1.Age);
//            Console.WriteLine("My anme is {0}. I am {1} years old!", person2.Name, person2.Age);
            // string verbous = "verbous";
            person1.IntroduceYourself("dumm");
            person2.IntroduceYourself();
            Console.WriteLine("My friend is {0}", person2.GetFriend(0));
            person3.IntroduceYourself();

            IncreasePopulation();
            IncreasePopulation();

            Console.WriteLine("The population is {0}", Human.counter);

            Console.WriteLine("National Income {0}", Human.CalculateNationalIncome());

            Console.WriteLine("Hello World!");
            Console.Read();
        }

        public static void IncreasePopulation()
        {
            Human person1 = new Human("Peshko", 15);
            //counter++;
        }
    }
}