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 strText = "That is not a chair.";

        string strRemovedString = "not ";

        int iIndex = strText.IndexOf("not",0);

        int ilength = strRemovedString.Length;

        string strNewText=strText.Remove(iIndex,ilength);

        Console.WriteLine(strNewText);

        //Advanced Loop

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

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

        int iSum = 0;

        int iInput=1;

​

​

        while(iInput>0)

        {

            Console.WriteLine("Please give me a number");

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

            iSum= 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("");

        }

    }

}