CMPU 102 Lab 2: Using iterative and decision statements 
  

Program 1:

    1.  Log in to your Vassar CS account.

    2.  Open the cs102 directory you created in the last lab by 
        entering the "change directory" command as follows:

          cd cs102

    3.  Change directory into the labs subdirectory by entering

          cd labs

    4.  Create a new directory for lab 2 by entering:

          mkdir lab2

    5.  Open the directory you created in the last step by entering:

         cd lab2

       For each of the 3 classes listed below, create a main 
       method and write the executable code in the main method.

    Program 1: FindSmallest.java

       a. Prompt for and read positive integers from the keyboard
          until the user enters 0. Use the java.util.Scanner class 
          to take in input using the nextInt() method. (Be nice to 
          the user and say please in your prompt.)

       b. You need to print each number as entered and store
          the smallest positive integer entered so far in a variable. 
          The initial values of the int entered and the smallest 
          int should initially be set to the MAX_VALUE constant of 
          the Integer class so the values entered by the user must 
          be smaller.

       c. After the user enters 0, the input should stop and you 
          should print the smallest number entered to the screen.
          
          Your program should work correctly if any number of 
          integers, even some with equal value, are entered.

        **Expected screen output from running this program**:

              Please enter any number of positive integers and I will 
              find the smallest.  Enter 0 to stop reading numbers.

              4
              9
              18
              22
              5
              0

              The smallest value is 4.

        or
              Please enter any number of positive integers and I will 
              find the smallest.  Enter 0 to stop reading numbers.

              43 75 8 9 7 67 0

              The smallest value is 7.

      Note that the numbers can be entered one per line or all on
      one line, separated by spaces. 



    Program 2: AssignGrade.java

       a. Create a class called "AssignGrade.java" in the lab2
          directory.  This class should read a score from the 
          user and calculate a character grade from the score.

       b. Prompt for and read a score (a possible real number) from 
          the keyboard using the showInputDialog of the JOptionPane 
          class. 

       c. Use the following scoring policy:

                     score >= 90       A
               80 <= score <  90       B
               70 <= score <  80       C
               60 <= score <  70       D
                     score <  60       F

       d. Use a series of "if", " if else" and "else" statements to 
          assign a letter grade of type char in each branch.

       e. Once you have assigned a letter grade, use a switch state-
          ment (your instructor will explain how a switch statement
          works at the start of the lab) to print the letter grade 
          along with one of the following comments:

            Letter grade           Comment
            ------------           -------
                'A'                Outstanding work!
                'B'                Very good work!
                'C'                Nice work.
                'D'                Good try.
                'F'                Happy trails.
      
   Look up the switch statement in the Java tutorial if you are not
   sure how to use it.  

    **Expected screen output from running this program**:

        Please enter a score between 0 and 100: 98.5 

        The grade is A: Outstanding work!
        
    Test your program a few times with different scores to convince 
    yourself it works. 
 

    Program 3: AssignGradeCheck.java

    After you save the AssignGrade program, change the name of the 
    AssignGrade program to AssignGradeCheck.java. Be sure to change 
    the class name of the AssignGrade class to AssignGradeCheck too. 
    This program should do what the AssignGrade program did, except 
    for the following added feature in the main method:

    a) Check that the user does actually enter a number between 
       0.0 and 100.0. 

       After you have read a score, add a while statement that 
       tests the score to see if it is out of range, and, if the 
       score entered is out of range, displays a message prompting 
       for a number between 0.0 and 100.0 and reads the score 
       again. This loop should continue until a number in the correct 
       range is entered. Look up the do while loop for this part. 

    b) The rest of this program should be just like the AssignGrade
       program.

    **Expected screen output from running this program**:

        Please enter a score between 0 and 100: 998

        That score is out of range.


        Please enter a score between 0 and 100: 79

        The grade is C: Nice work.
        

    Test your program a few times to convince yourself it works. 
    

BE SURE TO HAVE A COACH OR YOUR PROFESSOR SEE YOUR WORKING CODE AND
HAVE THEM CHECK YOUR NAME OFF ON THE LAB ROSTER AS HAVING COMPLETED 
THE LAB.  IF YOU KEEP THE LAB IN YOUR CS ACCOUNT, YOU CAN ALWAYS 
PRODUCE IT IF ASKED (AS MIGHT BE THE CASE IF SOMEHOW YOU DID NOT GET 
CHECKED OFF FOR THE LAB).

COMPRESS THE lab2 DIRECTORY AND SUBMIT IT ON THE COURSE MOODLE PAGE.