//################################################################
//
// Program4.java
//
//
// Reads the URL, assuming this format:
// http://www.cs.iastate.edu/~john
//
// and outputs an e-mail address from it
// john@cs.iastate.edu
//		
// Sample Run:
//
// Please enter an URL: http://www.iastate.edu/~john
//
// =====Debugging Information=====
//
// You entered: [http://www.cs.iastate.edu/~john]
// The '.' is at index = 10
// The '~' is at index = 26
// Domain name = [cs.iastate.edu]
// User name = [john]
//
// =====End of Debugging Information=====
//
//
// The e-mail address is: john@cs.iastate.edu
//
//################################################################

import java.util.Scanner;

public class Program4
{
   public static void main (String[] args)
   {
		Scanner scan = new Scanner(System.in);

		System.out.print("Please enter an URL: ");
		String url= scan.nextLine();
		// Use this line if you don't want to type it all the time
		//String url="http://www.cs.iastate.edu/~john";
		
		System.out.println("\n=====Debugging Information=====\n");
		System.out.println("You entered: [" + url + "]");

		// find the index of the first '.'
		int periodIdx = url.indexOf('.');	
		System.out.println("The '.' is at index = " + periodIdx);
		
		// find the index of the '~'
		int tildaIdx = url.indexOf('~');	
		System.out.println("The '~' is at index = " + tildaIdx);
		
		// Extract the doamin name from the URL
		String domainName= url.substring(periodIdx+1, tildaIdx-1); // -1 so the '/' is not included
		System.out.println("Domain name = [" + domainName + "]");

	        // Extract the user name from the URL	
		String userName= url.substring(tildaIdx+1, url.length()); 
		System.out.println("User name = [" + userName + "]");

		System.out.println("\n=====End of Debugging Information=====\n");

		// Print the e-mail address in this format:
		// userName@domainName
		String emailAddress = userName + "@" + domainName;
		System.out.println("\nThe e-mail address is: " + emailAddress);
	}
}