2016HelloWorld1b

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

namespace HelloWorld1b
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello World Stoyan!");
            Console.WriteLine(DateTime.Now);

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

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

            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("Is male? {0}", isMale);
            Console.WriteLine("I have {2,10:c2} USD. My name is {0}. I am {1} years old!. ", name, age, money);

            Console.WriteLine("Plese, enter your age:");
            string input = Console.ReadLine();
            age = byte.Parse(input);
            Console.WriteLine("Your age is {0}. In 10 years you will be {1}.", input, age + 10);

            byte a = 13;
            byte b = 5;
            // 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);

            if (age <= 20)
            {
                Console.WriteLine("You are a teenager!");
            }
            else if (age > 20 && age <= 30)
            {
                Console.WriteLine("You are an a golden age!");
            }
            else {
                Console.WriteLine("I don't know what to say!");
            }

            switch (age)
            {
                case 21:
                case 22:
                    Console.WriteLine("You are very sick!");
                    break;
                case 23:
                    Console.WriteLine("You are blue!");
                    break;
                default :
                    Console.WriteLine("I don't know what to say!");
                    break;
            }

            byte result = 23;
            Console.WriteLine(Convert.ToString(result, 2).PadLeft(16, '0'));
            // 0000000000110011
            /*
            Console.WriteLine(1);
            Console.WriteLine(2);
            Console.WriteLine(3);
            Console.WriteLine(4);
            Console.WriteLine(5);
            */

            int i = 1;
            /*
            while (i <= 1000)
            {
                if (i == 5) break;
                Console.WriteLine(i);
                i++;
            }

            Console.WriteLine("Please choose:");
            Console.WriteLine("1. List the partitions");
            Console.WriteLine("2. Create a partition");
            Console.WriteLine("3. Delete partiotion");
            Console.WriteLine("4. Exit");
            string choice = "";
            while (true)
            {
                //... do something smart
                choice = Console.ReadLine();
                if (choice == "4")
                {
                    break;
                }
            }
            */
            /*
            string choice = "";
            i = 1;
            do
            {
                Console.Clear();
                Console.WriteLine("Моля изберете:");
                Console.WriteLine("1. Пържени яйца");
                Console.WriteLine("2. Фасул");
                Console.WriteLine("3. Пиле с ориз");
                Console.WriteLine("4. Изход");
                // Console.WriteLine("do-while: {0}!", i);
                choice = Console.ReadLine();
                if (choice == "4")
                {
                    break;
                }

                if (choice == "1") {
                    Console.Clear();
                    Console.WriteLine("Натиснете който и да е клавиш, за да се върнете към главното меню!");
                    Console.WriteLine("За да си опържиш яийца ...");
                    choice = Console.ReadLine();
                }

                //if (choice == "1")
                //{
                //    do
                //    {
                //        Console.Clear();
                //        Console.WriteLine("Натиснете 4 за да се върнете към главното меню!");
                //        Console.WriteLine("За да си опържиш яийца ...");
                //        choice = Console.ReadLine();
                //        if (choice == "4") break;
                //    } while (true);

                //}

            }while(true);
            */
            for (i = 0; i < 100; i++)
            {
                if (i % 2 == 1) continue;
                if (i % 2 == 0)
                {
                    Console.WriteLine("for {0}", i);
                }

            }

            string[] names = { "Marina", "Mitko", "Plamen", "Mitko", "Dani", "Victor", "Valentin", "Vasko", "Yusein", "Sevelina", "Ivan"};

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

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

            int[] myArray = { 0,22,0,0,45};

            // myArray[1] = 22;
            // myArray[4] = 45;

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

            string[,] positionsOfTheStudents = {
                   {"Marina", "Mitko","","Plamen","","Mitko", "","Dani"},
                   {"Victor", "Valentin","","Vasil","Yusein","", "","Sevelina"},
                   {"", "","","","Ivan","", "",""}
            };


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

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

            int resultTest = 2040;
            Console.WriteLine(Convert.ToString(resultTest, 2).PadLeft(16, '0'));
            Console.WriteLine("{0,10:X}", resultTest);
            /*
            for (i = 0; i < 10; i++)
            {
                Console.Write('*');
            }
            Console.WriteLine();
            for (i = 0; i < 20; i++)
            {
                Console.Write('\\');
            }
            Console.WriteLine();
            for (i = 0; i < 80; i++)
            {
                Console.Write('^');
            }
            */

            Console.WriteLine(createString(8, '\\', "Stoyan","Mitko"));

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

            Console.WriteLine("Prime numbers:");
            bool isPrime = true;
            for (i = 2; i < 100; i++)
            {
                isPrime = true;
                for (int j = 2; j < i; j++)
                {
                    // if (i % j == 0)
                    if (i % Math.Sqrt(j) == 0) // better
                    {
                        isPrime = false;
                        break;
                    }
                }
                if (isPrime) {
                    Console.WriteLine(i);
                }
            }

            // Pine Tree
            Console.WriteLine("Pine Tree");
            int size = 80;
            for (i = 0; i < size; i++)
            {
                if (i % 2 == 0) continue;
                for (int k = (size - i) / 2; k > 0; k--)
                {
                    Console.Write(" ");
                }
                for (int j = 0; j < i; j++)
                {
                    Console.Write("*");
                }
                Console.WriteLine();
            }


            Console.WriteLine("The number 0xfabc = {0,10:d} ", 0xfabc);
            Console.WriteLine("The number 64188 = {0,10:x}", 64188);

        }

        static string createString(int n, char c = '*', params string[] extra)
        {
            string temp = "";
            if (extra.Length > 0 && extra[0] != null)
            {
                for (int i = 0; i < extra.Length; i++ )
                {
                    temp += extra[i];
                }
            }
            for (int i = 0; i < n; i++ )
            {
                temp += c;
            }
            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;
        }



    }
}