Attendance at the lab session on Thursday, Aug 21, is worth 20 points. It is recorded separately from the lab grade.

This is an individual lab. Every student is expected to do all the activities by themselves.

Educational goals of this lab - verify that every student can

• communicate with their professor by email
• use jGRASP IDE to create and run a program in Java
• detect and correct errors in a program using the IDE

INSTRUCTIONS:

Log onto a computer with your University userid. If you can't do this because you haven't activated your University account yet, tell your instructor. You MUST activate your University account as soon as possible!

1. (20 points) Problem #1: Email your instructor
   • Send email to your professor. The subject line must be "Lab 1 CS1301 Section C". Your professor's email address is rpmihail@valdosta.edu
   • You MUST use your "valdosta.edu" account for this email. If you have this email account forwarded to some other one, please turn off the forwarding long enough to send this one email. Then you can turn forwarding back on. We must verify that you know how to read mail at that account. It is used by the University administration if they need to contact you! It will be used to send you your feedback and grade on most of the work in this class. Privacy laws are requiring us to verify that we are communicating with VSU students.
   • If you have another email account you prefer to use, then put that address in the body of the message and tell your professor you'd prefer they use that one. If you prefer to use the valdosta.edu address, say that.
   • Send a carbon copy to yourself.
   • If you prefer another email address, you are still responsible for email sent to your valdosta.edu address. Make sure you check it regularly or keep it forwarded somewhere you do read! You can access your university email account from any computer connected to the Internet from this link: http://www.valdosta.edu/.
   • The body of the message must also contain the answers to the questions (not an attachment!):
     1. If you and another student work together on a program assignment what is that classified as in this class? (note: this is a very specific question - look it up in the Syllabus! there is only ONE right answer)
     2. What is the minimum penalty for cheating / plagiarism prescribed by the University policy?
     3. What is the late penalty for program assignments? (Be complete.)
     4. What percentage of the overall grade is the final exam?
   • This email to your instructor must be sent by Friday, August 22, midnight.

2. (20 points) Problem #2: Getting a program up and running
   • Copy and paste the Java program below into the jGRASP editor and get it to run exactly as given. You will have to create a new java file (File->New->Java). Make sure you save it as triangle.java!!

     /* * * * * *
       Program to find the third side of a right triangle. 
     
        Author name: 
        Class:
        Section:
        Date: 
        Purpose: compute the hypotenuse of a right triangle, given the lengths of the two legs. 
        
        Preconditions: 
           1. user has to input valid name 
           2. leg1 and leg2 have to be numbers 
        Postconditions:
           Program greets you and outputs length of hypotenuse.
     
       Design: 
        1. ask user for name then greet the user
        2. ask the user for the two legs of a right triangle and read them in
        3. calculate the third side (use the Pythagorean theorem)
        4. output the results with an appropriate label
        
        
     * * * * * */
     import java.util.Scanner;
     
     class triangle {
        public static void main(String argv[])
        {
           System.out.println("Hello!\nEnter your name: "); // Command to print out text 
           
           Scanner user_input = new Scanner( System.in ); // user_input used for keyboard input
           
           String name = user_input.next(); // get user's name
           
           System.out.println("Hi " + name + "! We will do some math now."); // say user's name
     
           System.out.println("Enter the length of leg1: "); // ask for length of leg1 
           double leg1 = Float.parseFloat(user_input.next()); // get it from the keyboard and store as a double precision floatint point number 
     
           System.out.println("Enter the length of leg2: "); // ask for length of leg2 
           double leg2 = Float.parseFloat(user_input.next()); // get it from keyboard and store it 
     
           double hypotenuse = Math.sqrt(leg1*leg1 + leg2*leg2); // calculate the hypotenuse (using the Pythagorean theorem)
     
           System.out.print("The length of the hypotenuse is: "); // output/print message
           System.out.print(hypotenuse); // output/print the length of hypotenuse
           // that's it
        }
     }
     

   • (10 points) Notice the information in the comments at the top of the program. This is called the program prolog. You are required to provide a prolog for the five program assignments. Providing a prolog will be part of the grade for the program. Change this prolog to match your information.
   • (10 points) Show your instructor that you can run this program.
   • Save the program as triangle.java on your jumpdrive. Run the program. It should run without errors and produce correct output. Submit the program an an individual submission for Lab 1 from the electronic assignment submit link page here. Submission must be done by Friday, August 22, midnight. Notice that if your program has syntax errors, an error message would appear between the two horizontal bars. For this submission there should be no error message.

3. (40 points) Problem #3: Playing with the program

   Now you are going to experiment with the program given in Problem #2. In each of the cases below, make the change and run the program. If it runs alright (without errors or warnings), your answer is "runs ok". If it doesn't run alright, write down the error message that jGRASP gives, including the line number that it indicates the error or warning is on. Then change the program back to its original form before performing the next change. Use an editor like Notepad to put the answers for this problem in a file "answers-Lab1.txt". Submit this file when you are finished using the link at the bottom of the page.

   1. Take out just the symbol / at the start of the first line of the file.
   2. Take out just the symbol ; on the assignment statement String name = user_input.next(); // get user's name
   3. Replace print with println from System.out.print("The length of the hypotenuse is: "); // output/print message and report the errors OR difference in output from the original.
   4. Drop the [] from String argv[].

   When you are finished with this lab, you should have:

   • submitted the triangle.java file
   • submitted the answers-Lab1.txt file
   • emailed your professor

   Submit your files with this link. Your class is CS1301, you are submitting a lab, section C, code. Use 1 menu choice from which lab or assignment

   Log off properly - you don't want your account misused by someone else!

   Remember NOT to leave files on the local hard drives in this lab or anywhere else on campus! Make sure you save your projects on a portable storage device you take with you!

   Submission Deadlines:

   Email sent by Thursday, August 21, midnight
   Submission of triangle.java program and answers to questions due by Friday, August 22, midnight.