C#_OOP_3a_Program.cs

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

namespace App3a
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine(Human.PI);
            Console.WriteLine(Human.onlyRead);
            // int counter = 0;
            Human person1 = new Human("Stoyan", 50);
            // counter++;
            Human person2 = new Human(20, "Ivan", "Pesho", "Nikola");

            // counter++;
            Human person3 = new Human();
            Human person4 = new Human();
            // counter++;

            // Console.WriteLine("My name is {0}. I am {1} years old! My Balance is {2}.", person1.Name, person1.Age, person1.Balance);
            // Console.WriteLine("My name is {0}. I am {1} years old!", person2.Name, person2.Age);

            Human.Nationality = "German";

            person1.IntroduceYourSelf("verbous");
            person2.IntroduceYourSelf();
            Console.WriteLine(person2.GetFriend(0));
            person3.IntroduceYourSelf();

            IncreasePopulation();

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

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

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

        public static void IncreasePopulation()
        {
            Human person1 = new Human("Pesho", 15);
        }
    }
}