2016HelloWorld1a

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

namespace HelloWorld1a
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello World!");

            ulong age = 52u;
            decimal money = 2.54m;
            char firstLetter = 'S';
            string name = "Mariya";

            Console.WriteLine("Your age in 10 years will be : " + (age + 10));

            Console.WriteLine("Tell me your age?");
            string input = Console.ReadLine();
            int age2 = int.Parse(input);

            Console.WriteLine("Your age in 5 years will be: " + (age2 + 5));

            if (age2 < 20)
            {
                Console.WriteLine("You are a teenager!!!");
            }
            else if (20 <= age2 && age2 <= 30)
            {
                Console.WriteLine("You must be a student!");
            }
            else
            {
                Console.WriteLine("You are an adult!");
            }

            switch (age2)
            {
                case 22 :
                case 23 :
                    Console.WriteLine("You are 22 or 23 years old. Very sick!");
                    break;
                default :
                    Console.WriteLine("I see a bad spell!");
                    break;
            }

            /*
            Console.WriteLine(1);
            Console.WriteLine(2);
            Console.WriteLine(3);
            Console.WriteLine(4);
            */
            int i = 1;
            while (i <= 10)
            {
                if (i == 5) break;
                Console.WriteLine(i);
                i++;
            }

            i = 1;
            do
            {
                Console.WriteLine("do-while: {0}", i);
                i++;
            } while(i <= 10);

            for (i = 0; i < 10; i++)
            {
                Console.WriteLine("for {0}", i);
            }

            string[] studentNames = { "Boryana", "Mariya", "Petya", "Elena", "Georgi", "Mitko", "Sasho", "Nikoleta", "Alex", "Petar", "Mitko" };

            foreach(string nameSt in studentNames)
            {
                Console.WriteLine(nameSt);
            }

            for (i = 0; i < 10; i++)
            {
                for(int j = 0; j < i; j++)
                {
                    // Console.Write(new String(' ', 10/2 - i) + '*');
                    Console.Write('*');
                }
                Console.WriteLine();
            }

            // 1.
            // int[] myArray;
            // myArray = new int[5];

            // 2.
            // int[] myArray = new int[5];

            // 3.
            // int[] myArray = { 0, 0, 0, 0, 45};
            int[] myArray = new int[5] { 0, 0, 0, 0, 45 };

            myArray[4] = 45;

            for (i = 0; i < myArray.Length; i++)
            {
                Console.WriteLine("myArray[{0}] = {1}", i, myArray[i]);
            }

            string[,] positionsOfTheStudents = {
                   {"Boryana", "Mariya","","Petya","Elena","", "",""},
                   {"Georgi", "Mitko","","Sasho","Nikoleta","", "Alex",""},
                   {"", "","","","","", "Petar","Mitko"}
            };

            for(i = 0; i < positionsOfTheStudents.GetLength(0); i++)
            {
                for (int j = 0; j < positionsOfTheStudents.GetLength(1); j++)
                {
                    Console.WriteLine("Row {0} Col {1} : {2}", i, j, positionsOfTheStudents[i,j]);
                }
            }

            int[][] jaggedArray;
            jaggedArray = new int[2][];
            jaggedArray[0] = new int[8];
            jaggedArray[1] = new int[5];


            byte result = 148;
            Console.WriteLine(Convert.ToString(result, 2).PadLeft(16, '0'));
            Console.WriteLine("{0,10:X}", result);
            /*
            for (i = 0; i < 10; i++)
            {
                Console.Write("&");
            }
            for (i = 0; i < 15; i++)
            {
                Console.Write("^");
            }
            */

            Console.WriteLine(createString(10, '%', "Stoyan", "Ivan"));
            Console.WriteLine(createString(70,'$'));

            Console.WriteLine(factorial(4));

        }

        static string createString(int n, char c = '*', params string[] extra)
        {
            string temp = "";
            for (int i = 0; i < n; i++)
            {
                temp += c;
            }

            if (extra.Length != 0 && extra[0] != null) Console.WriteLine(extra[0]);

            return temp;
        }

        static int factorial(int n)
        {
            if (n == 0) return 1;
            return factorial(n - 1) * n;
        }

        static int factorialIteration(int n)
        {
            int temp = 1;
            for (int i = 1; i <= n; i++)
            {
                temp *= i;
            }
            return temp;
        }

    }
}