2016HelloWorld2b

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

namespace HelloWorld2b
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello Stoyan!");
            // Console.BackgroundColor = ConsoleColor.Cyan;
            Console.WriteLine(DateTime.Now);

            byte age = 52;
            double money = 2.54;
            char firstLetter = 'S';
            string name = "Stoyan";
            bool isMale = true;

            double sum = 0.1 + 0.2;
            Console.WriteLine(sum == 0.3);

            Console.WriteLine("I am {0} years old", age);
            Console.WriteLine("I have {0} USD", money);
            Console.WriteLine("The first letter of my name is {0}", firstLetter);
            Console.WriteLine("My name is {0}", name);
            Console.WriteLine("Am I  amn? {0}", isMale);

            byte a = 3;
            byte b = 1;

            Console.WriteLine("{0} + {1} = {2}", a, b, a + b);
            Console.WriteLine("{0} - {1} = {2}", a, b, a - b);
            Console.WriteLine("{0} * {1} = {2}", a, b, a * b);
            Console.WriteLine("{0} / {1} = {2}", a, b, a / b);
            Console.WriteLine("{0} % {1} = {2}", a, b, a % b);
            Console.WriteLine("++{0}  = {1}", a, ++a);

            // 2. comparison
            Console.WriteLine("{0} < {1} = {2}", a, b, a < b);
            Console.WriteLine("{0} > {1} = {2}", a, b, a > b);
            Console.WriteLine("{0} <= {1} = {2}", a, b, a <= b);
            Console.WriteLine("{0} >= {1} = {2}", a, b, a >= b);
            Console.WriteLine("{0} == {1} = {2}", a, b, a == b);
            Console.WriteLine("{0} == {1} = {2}", a, b, a != b);

            // 3. Boolean
            bool c = true;
            bool d = false;

            Console.WriteLine("{0} && {1} = {2}", c, d, c && d);
            Console.WriteLine("{0} || {1} = {2}", c, d, c || d);
            Console.WriteLine("{0} ^ {1} = {2}", c, d, c ^ d);
            Console.WriteLine("!{0} = {1}", c, !c);


            Console.WriteLine("{0} << 1 {1}", 1, 1 << 1);
            Console.WriteLine("{0} >> 1 {1}", 1, 1 >> 1);
            Console.WriteLine("{0} | {1} = {2}", a, b, a | b);
            Console.WriteLine("{0} & {1} = {2}", a, b, a & b);
            Console.WriteLine("{0} ^ {1} = {2}", a, b, a ^ b);
            Console.WriteLine("~{0} = {1}", a, ~a);

            Console.WriteLine("Please, enter your age:");
            string input = Console.ReadLine();
            age = byte.Parse(input);


            Console.WriteLine("In 10 years you will be {0}", age + 10);

            if (age <= 18)
            {
                Console.WriteLine("You are a teenager!");
            }
            else if (age >= 20 && age <= 30)
            {
                Console.WriteLine("You are in a golden age!");
            }
            else
            {
                Console.WriteLine("You are an adult!");
            }

            switch (age)
            {
                case 22:
                case 23:
                    Console.WriteLine("You are very sick!");
                    break;


            }

            Console.WriteLine(2 + 3 < 3 + 4 && 7 * 1 + 1 > 7 + 5);

            //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 = 11;
            do
            {
                Console.WriteLine("do-while: {0}", i);
                i++;
            } while (i <= 10);


            //string choice = "";
            //do
            //{
            //    Console.Clear();
            //    Console.WriteLine("Добре дошли в рецептурника на шеф Манчев");
            //    Console.WriteLine("Моля изберете:");
            //    Console.WriteLine("1. Мусака");
            //    Console.WriteLine("2. Пиле с ориз");
            //    Console.WriteLine("3. Пиле със зеле");
            //    // ... Do something smart
            //    Console.WriteLine("4. Изход");
            //    choice = Console.ReadLine();

            //    switch(choice)
            //    {
            //        case "1" :
            //            Console.Clear();
            //            Console.WriteLine("За да се върнете към главно меню натиснете кой да е клавиш!");
            //            Console.WriteLine("Чушките се нарязват на едро. Ситно нарязаният лук и настърганият морков се запържват в олиото. ");
            //            choice = Console.ReadLine();
            //            break;
            //    }

            //} while (choice != "4");


            for (i = 0; i < 100; i++)
            {
                if (i % 2 != 0) continue;
                Console.WriteLine("for : {0}", i);
            }

            string[] names = { "Vilina", "Angie", "Rado",
                                 "Vesi", "Milena", "Svetoslav",
                                 "Simeon", "Mihaela", "Stoyan",
                                 "Niki", "Alex", "Pesho", "Angel"};

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

            // string nameSt; // This is not correct

            // child block scope
            {
                string nameSt; // it is OK
            }

            // 1.
            // int[] myArray; // = new int[5];
            // myArray = new int[5];
            // 2.
            // int[] myArray = new int[5];
            // 3.
            int[] myArray = { 0, 0, 0, 0, 45, 56 };

            // myArray[4] = 45;

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

            string[,] positionOfTheStudents = {
                            {"", "Vilina", "", "", "Rado", "", "", ""},
                            {"Vesi", "Milena", "", "", "Simeon", "Mihaela", "", ""},
                            {"", "Stoyan", "", "Niki", "Alex", "", "Petar", "Angel"},
             };

            for(i = 0; i < 3; i++)
            {
                for(int j = 0; j < 8; j++)
                {
                    Console.WriteLine("positionOfTheStudents[{0},{1}] = {2}", i, j, positionOfTheStudents[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();
            //for(i = 0; i < 10; i++)
            //{
            //    Console.Write("*");
            //}
            //Console.WriteLine();
            //for (i = 0; i < 20; i++)
            //{
            //    Console.Write("^");
            //}

            Console.WriteLine(createString(10));
            Console.WriteLine(createString(20));

            Console.WriteLine("6! = {0}", factorial(6));
        }

        static string createString(int n, char c = '*')
        {
            string temp = "";
            for (int i = 0; i < n; i++ )
            {
                temp += c; // <=> temp = temp + c;
            }
            return temp;
        }

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

    }
}