using System;

​

public class Program

{

    public static void Main()

    {

        //String & foreach loop

        string strItemCode = "sony-dvd-062019";

        string[] strInfoArray = strItemCode.Split('-');

        //[Code] Use foreach to print out each element.

        foreach (string element in strInfoArray)

        {

            Console.WriteLine(element);

        }

​

        Console.WriteLine("====================");

        //String Skills

        //Remove "not " from the following string and print it out (DO NOT hard code the index)

        string strBefore = "That is not a chair.";

        Console.WriteLine("Before: " + strBefore);

        string strText = "That is not a chair.";

        string strRemovedString = "not ";

        //[Code] Use IndexOf and Length to remove "not "

        strText = strText.Remove(strText.IndexOf(strRemovedString), strRemovedString.Length);

        Console.WriteLine("After: " + strText);

        Console.WriteLine("====================");

        //Advanced Loop (1)

        //Write a C# program that validates and displays birthdays that follow the specific format XX/XX/XXXX (where X represents a digit) from an array of birthday strings.

        //Print out birthday with correct format. Use loop and split to accomplish this task.

        string[] birthday_array =

        {

            "01/01/1990",

            "12/31/1995",

            "2/29/2008", // Does not match because '2/29' lacks leading zeroes

            "04/20/1985",

            "July 4, 1776", // Does not match because it doesn't use '/'

            "10/31/2000"

        };

        foreach (string birthday in birthday_array)

        {

            string[] parts = birthday.Split('/');

            if (parts.Length == 3 && parts[0].Length == 2 && parts[1].Length == 2 && parts[2].Length == 4)

            {

                Console.WriteLine(birthday);

            }

        }

​

        //Advanced Loop (2)

        //Write a program to keep asking for a number until a user enter zero.

        //At the end, print the sum of all entered numbers.

        int iInput = 1;

        int iSum = 0;

        while (iInput != 0)

        {

            Console.WriteLine("Please enter a number: ");

            iInput = Convert.ToInt32(Console.ReadLine());

            iSum += iInput;

        }

​

        Console.WriteLine("Sum: {0}", iSum);

        //Print *

        for (int i = 1; i <= 5; i++)

        {

            for (int j = 1; j <= i; j++)

            {

                Console.Write("*");

            }

​

            Console.WriteLine("");

        }

    }

}