Question

2. Using the Prelude to Programming book, complete Programming Challenge 2 on page 463. Save your file as LASTNAME_FIRSTNAME_M07HW2. (worth 15 points)

Create a program that allows the user to input a list of first names into one array and last names into a parallel array. Input should be terminated when the user enters a sentinel character. The output should be a list of email addresses where the address is of the following form: [email protected].

please help!!!!

Answer 1

Hi,

Hope you are doing fine. I have writrten the code for the above question in java. The logic is pretty straight forward and the clear explanation is provided using the comment sthat have been highlighted in bold. Also have a look at the code snippet below the program to get a clear picture of the indentation of the code.

Program:

import java.util.Scanner;

public class Name {

   public static void main(String[] args) {
       // TODO Auto-generated method stub
       //array to store first names
       String [] first =new String[100];
       //array to store last names
       String [] last =new String[100];
       //sentinel variable of type String which is assigned to 'y' initially
       String sentinel="y";
       //to traverse through the index of array
       int i=0;
       //creating new scanner for input from user
       Scanner sc=new Scanner(System.in);
       System.out.println("Enter first and last names of users\n");
      //while sentinel is not equal to 'n' the loop continues
       while(!sentinel.equals("n"))
       {
           System.out.println("Enter first name: ");
           //Storing the first name entered by user in first[i]
           first[i]=sc.next();
           System.out.println("Enter last name: ");
           //Storing the last name entered by user in last[i]
           last[i]=sc.next();
           System.out.println("Enter any key to continue and 'n' to stop");
           //Taking sentinel input
           sentinel=sc.next();
           //incrementing i value to next index
           i++;
       }
       //Printing empty line
       System.out.println();
       System.out.println("List of emails: ");
       //this for loop traverses the two arrays first and last. Maximum size of both arrays is i
       for(int j=0;j<i;j++)
           //Printing output as per question. '+' is used to concatenate two strings
           System.out.println(first[j]+"."+last[j]+"@mycollege.edu");      
   }

}

Executable code snippet:

Output: