CSE110 Assignment #6 Solved

• Object Oriented Programming & Methods (Chapter 5 & 8) – Tester class development (Command Menu)
– Implementing instance methods

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

Use the following Guidelines:

• Give identifiers semantic meaning and make them easy to read (examples numStudents, grossPay, etc).
• Keep identifiers to a reasonably short length.
• User upper case for constants. Use title case (first letter is upper case) for classes. Use lower case

  with uppercase word separators for all other identifiers (variables, methods, objects).

• Use tabs or spaces to indent code within blocks (code surrounded by braces). This includes

  classes, methods, and code associated with ifs, switches and loops. Be consistent with the number

  of spaces or tabs that you use to indent.

• Use white space to make your program more readable.

  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. (If not, -1 Pt)

  //*********************************************************** // Name: your name
  // Title: title of the source file
  // Description: Write the description in your words.

  // Time spent: how long it took you to complete the assignment // Date: the date you programmed //**********************************************************

Maximum points: 20 pts

Part 1: There are no written exercises in this assignment Part 2: Programming (20 points):

1) Write a class definition (not a program, there is no main method) named Fraction (saved in a file Fraction.java) that calculates the math operations as a fraction. A Fraction is an object with two integers, numerator and denominator. A new Fraction object starts as 0 (0/1). The test program asks to choose the operation (+, -, *, or /) and type two integers as one single line. Then, the Fraction shows the operation and result.

Your Fraction class must have: • two instance variables

– the numerator and denominator (Fraction = 𝑛𝑢𝑚𝑒𝑟𝑎𝑡𝑜𝑟 ) 𝑑𝑒𝑛𝑜𝑚𝑖𝑛𝑎𝑡𝑜𝑟

• Must implement the following methods

void simplify()

2) Download and complete (fill out the missing code) the test driver called Assignment6.java (5 Pts). Assignment6.java contains the main method and creates a new Fraction object to test the methods in the class Fraction. Assignment6.java will ask a user to enter one of the following commands. Based on the user’s choice, the program needs to perform corresponding operation. This will be done by calling (invoking) one of the methods you defined in the Fraction class. The program will terminate when the user enters ‘q’.

Command Options ———————————–
c: reset the value
+: add a fraction to the current value
-: subtract a fraction from the current value *: multiply a fraction to the current value /: divide the current value by a fraction
?: display the menu again
q: quit this program

Here is the description for each option:

You must complete the code inside cases ‘c’, ‘+’, ‘-‘, ‘*’ and ‘/” to read the needed input, call the appropriate method of the Fraction class, and display an appropriate output. A sample output is shown below.

Helpful hints for doing this assignment:

• work on it in steps – write one method, test it with a test driver and make sure it works before going on to the next method
• always make sure your code compiles before you add another method
• your methods should be able to be called in any order
• Operation of Factions: The result is also a Fraction, which needs two values of new numerator and denominator as shown below.

A∗B = <𝐴𝑛𝑢𝑚𝑒𝑟𝑎𝑡𝑜𝑟> ∗ <𝐵𝑛𝑢𝑚𝑒𝑟𝑎𝑡𝑜𝑟> < 𝐴 𝑑𝑒𝑛𝑜𝑚𝑖𝑛𝑎𝑡𝑜𝑟 > < 𝐵 𝑑𝑒𝑛𝑜𝑚𝑖𝑛𝑎𝑡𝑜𝑟 >

= < 𝐴 𝑛𝑢𝑚𝑒𝑟𝑎𝑡𝑜𝑟 > ∗ < 𝐵 𝑛𝑢𝑚𝑒𝑟𝑎𝑡𝑜𝑟 > = < 𝐴 𝑑𝑒𝑛𝑜𝑚𝑖𝑛𝑎𝑡𝑜𝑟 > ∗ < 𝐵 𝑑𝑒𝑛𝑜𝑚𝑖𝑛𝑎𝑡𝑜𝑟 >

A+B = <𝐴𝑛𝑢𝑚𝑒𝑟𝑎𝑡𝑜𝑟> + <𝐵𝑛𝑢𝑚𝑒𝑟𝑎𝑡𝑜𝑟> < 𝐴 𝑑𝑒𝑛𝑜𝑚𝑖𝑛𝑎𝑡𝑜𝑟 > < 𝐵 𝑑𝑒𝑛𝑜𝑚𝑖𝑛𝑎𝑡𝑜𝑟 >

𝑛𝑒𝑤 𝑛𝑢𝑚𝑒𝑟𝑎𝑡𝑜𝑟 𝑛𝑒𝑤 𝑑𝑒𝑛𝑜𝑚𝑖𝑛𝑎𝑡𝑜𝑟

= < 𝐴 𝑛𝑢𝑚𝑒𝑟𝑎𝑡𝑜𝑟 > ∗ < 𝐵 𝑑𝑒𝑛𝑜𝑚𝑖𝑛𝑎𝑡𝑜𝑟 > + < 𝐵 𝑛𝑢𝑚𝑒𝑟𝑎𝑡𝑜 > ∗< 𝐴 𝑑𝑒𝑛𝑜𝑚𝑖𝑛𝑎𝑡𝑜𝑟 > < 𝐴 𝑑𝑒𝑛𝑜𝑚𝑖𝑛𝑎𝑡𝑜𝑟 > ∗ < 𝐵 𝑑𝑒𝑛𝑜𝑚𝑖𝑛𝑎𝑡𝑜𝑟 >

Sample Output (user input is in red, which will not seen online submission):

© Yoshihiro Kobayashi <[email protected]>

[Please enter a command or type ?] c Value:0

[Please enter a command or type ?] +
[Enter two numbers for a fraction to ADD] 3 5 0 + 3/5 = 3/5
Value:3/5

[Please enter a command or type ?] +
[Enter two numbers for a fraction to ADD] 1 2 3/5 + 1/2 = 11/10
Value:11/10

[Please enter a command or type ?] –
[Enter two numbers for a fraction to SUBTRACT] 2 3 11/10 – 2/3 = 13/30
Value:13/30

[Please enter a command or type ?] * [Enter two numbers for a fraction to 13/30 * 4/7 = 26/105
Value:26/105

[Please enter a command or type ?] c Value:0

MULTIPLY] 4 7

[Please enter a command or type ?] +
[Enter two numbers for a fraction to ADD] 4 2 0 + 4/2 = 2
Value:2

[Please enter a command or type ?] /
[Enter two numbers for a fraction to DIVIDE] 12 8

© Yoshihiro Kobayashi <[email protected]>

2 / 12/8 = 4/3
Value:4/3

[Please enter a command or type ?] ?

Command Options ———————————–
c: reset the value
+: add a fraction to the current value
-: subtract a fraction from the current value *: multiply a fraction to the current value /: divide the current value by a fraction
?: display the menu again
q: quit this program

Value:4/3

[Please enter a command or type ?] q *** End of Program ***