using System;

public class Program

{

    public static void Main()

    {

        //1. Read string from the user and show the lenght of the name string

        Console.WriteLine("Please enter your name");

        string strName = Console.ReadLine();

        Console.WriteLine("Welcome " + strName);

​

        //Print out Length of Name

        Console.WriteLine("length is " + strName.Length);

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

​

        //2. Transformations (upper and lower case)

        string strTransformation = "My FIrst stRinG.";

        //Print lower case

        Console.WriteLine("transforming UC to lower case: " + strTransformation.ToLower());

        //Print upper case

        Console.WriteLine("transforming LC to upper case: " + strTransformation.ToUpper());

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

​

        //3. Trimming

        string strTrim = " my   string         test    ";

        //print out trimming content

        Console.WriteLine("removing the white space:" + strTrim.Trim()); 

        //notice it doesn't remove the in between spaces!

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

​

        //4. Search

        string strSample = "Is it a book?";

        //Does this string contain a period?

        bool bolHasPeriod;

        bolHasPeriod = strSample.Contains(".");

        Console.WriteLine("bolHasPeriod:" + bolHasPeriod);

        //Does this string start with "Is"?

        bool bolIsStartWithIs;

        bolIsStartWithIs = strSample.StartsWith("Is");

        Console.WriteLine("bolIsStartWithIs:" + bolIsStartWithIs);

        //Does this string end with a question mark?

        bool bolIsQuestion;

        bolIsQuestion = strSample.EndsWith("?");

        Console.WriteLine("bolIsQuestion:" + bolIsQuestion);

        //Where is the first "n"?

        strSample = "Indiana University";

        int intN;

        intN = strSample.IndexOf("n");

        Console.WriteLine("intN:" + intN);

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

​

​

        //5. Substring

        string strEmail = "superman@iu.edu";

        //print out username

        int atIndex = strEmail.IndexOf("@");

        if (atIndex < 0) 

        {

            Console.WriteLine("Not a valid email");

            return;

        }

        Console.WriteLine(strEmail.Substring(0, atIndex)); // What happens if there is no @ sign? How can you prevent this run-time error?

        //print out domain name

        Console.WriteLine(strEmail.Substring(atIndex+1));

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

​

        //6. Replace, Remove, Insert

        //Replace . with *

        string strPhone = "812.212.3456";

        strPhone = strPhone.Replace(".", "*");

        Console.WriteLine("strPhone:" + strPhone);

        //Remove "212"

        strPhone = "812.212.3456";

        strPhone = strPhone.Remove(4, 3);

        Console.WriteLine("strPhone:" + strPhone);

        //Add (). For instance: (812)2123456

        strPhone = "8122123456";

        strPhone = strPhone.Insert(0, "(");

        strPhone = strPhone.Insert(4, ")");

        Console.WriteLine("strPhone:" + strPhone);

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

    }

}