[SOLVED] CSE110 Assignment #2

• If statements (if, if/else, if/else if)
• Expressions (<, >, ==, !=)
• String methods: indexOf (String), substring(int, int),

  compareTo(String), toUpperCase(), toLowerCase()

• Important Note:

  All submitted assignments must begin with the descriptive comment block. To avoid losing trivial points, make sure this comment header is included in every assignment you submit, and that it is updated accordingly from assignment to assignment. Your programming assignments require individual work and effort to be of any benefit. Every student must work independently on his or her assignments. This means that every student must ensure that neither a soft copy nor a hard copy of their work gets into the hands of another student. Sharing your assignments with others in any way is NOT permitted. Violations of the University Academic Integrity policy will not be ignored. The university academic integrity policy is found at http://www.asu.edu/studentlife/judicial/integrity.html

Maximum points:

Part 1: Writing Exercise:

This assignment has two parts. The first part is to write the answers briefly in your words. and it is not a coding question but English writing question. Part 1 is a hint for Part 2. Part 1 shows a sample code to try to sort three integers, and Part 2 is asked to make a program to sort three strings. Try to answer the Part 1 questions first, then apply to the string case in Part 2.

The following code is supposed to read three integers and sort them from the smallest to the largest. It creates six integer variables. The a, b, and c are used for the first, second, and third user inputs. The small, middle, and large are used to assign the values from a, b, c corresponding to the order of values. Write the code and test it. If it works, then answer each question below. (Don’t submit this ThreeInteger.java as an assignment #2 )

1. This program is not completed but keep it as it is. Test six cases to figure out what is wrong. For the case of 1, 4, and 6 inputs, we need to test the 6 cases of one by one. (first, second, third) = (1, 4, 6), (1, 6, 4), (4, 1, 6), (4, 6, 1), (6, 1, 4), and (6, 4, 1).
   Test all of them above and write the input and output of wrong case(s), and explain the reason in your word. (1pt)
2. In the line 23 (the line numbers are shown in the left of code), write a single statement in the else-block to make the program sort in all six cases correctly. (1pt).
3. The code is to compare three numbers.
   Suppose to develop another program to compare three string data. When you check the

alphabet order of string data instead of numbers, it is required to use compareTo(String) method. For example, if you want to compare str1=”Yoshi” and str2=”Mario”, use

     if(str1.compareTo(str2) > 0)

Read the textbook (Special Topic 3.2) and answer whether the if-statement above is

evaluated as true or false, and explain the reason in your words. (1 pt).

4. Answer the result of the snipped code below, and explain the reason. (1 pt).

        String a = "Yoshi";
        String b = "yoshi";
        System.out.println( a.compareTo(b) );
   

5. All characters are ordered in Java. The alphabet letters are ordered as “A”, “B”, “C”… “Z”, “a”, “b”…. “y”, “z”. In other words, if a capitalized letter is not between “A” and “Z”, the letter must not be an alphabet such as a special symbol or number. Make the if- statement to check if a string variable (supposed to be a single letter), str, is an alphabet letter or not. (1 pt).

   if (
   str.toUpperCase().compareTo(???) >=0 && str.toUpperCase().compareTo(???) <= 0 )

Note: The answers to the 5 questions (a through e) above should be typed in the block of comments in the java file such as;

//*********************************************************** // Name: Your name here
// Title: AssignmentX.java
// Description: Short description should be typed here.

// Date: mm/dd/yyyy //***********************************************************
/*
a) For Input (X, X, X), it returns a wrong output as (X, X, X), because …
b) xxx = xxxx;
c) XXX because …
d) XXX because …
e) XXX and XXX
*/

Part 2: Programming (15 pts)

Write a Java program called Assignment2.java. The program is to display questions and read user inputs, then calculate and print out the requested value with a proper format. This program will follow a very simple process.
*) Part1 is a big hint for this part.

1. Read three names one by one, and display the list in alphabetic/lexicographic order (5 pts). For example, when the inputs are “Smith”, “john”, and “mike”, it displays:

   JOHN, MIKE, SMITH

2. All letters of output (displayed) name should be capitalized (5 pts). Line breaks may be different from the submission output and your local output, but no problem.
3. However, if the name starts with non-alphabetic letter, then display an error message (5 pts) after it is input. In the case, use a blank name. Look at the example execution for more details and the display format.

   (*) Use the compareTo(String) method. (Special Topic 3.2 in Textbook)

IMPORTANT on Programming

•   It is allowed to make only one Scanner variable. In your PC, it may work with multiple Scanner variables, but the server site (online submission) does not accept it. If you make more than one Scanner variables, you may lose all 15 points.
•   Use only the Java statements that have been covered in class (or textbook) to date. This means you CAN use declaration, assignment, input and output statements. DO NOT use any other statements ( loop, array, break, sort, etc.). If in doubt, ask your TA or instructor. If you use them, then you lose the points of task.
•   Use the scanner’s next() method instead of nextLine()when you read the String data using Scanner in this assignment. Your PC can work in either way, but not on the server site.

  Example Execution:

  The following is an example input and output. The input is shown in red (Not displayed But typed). Make your own questions rather than this example.

  Example 1

Get input

----------------
YOUR OUTPUT 1
----------------

Calculate

Display results

*** END OF Assignment#2 ***

Example 2

*** END OF Assignment#2 ***