CSE 110
–
ASSIGNMENT # 4
–
Fall 2015
Due: Tuesday
October
6
by 10:00AM
Maximum Points: 20 pts
Topics
•
Loops (Chapter 4)
Note:
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 i
nto 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/studentaffairs/studentlife/judicial/academic_integrity.htm
Use the following Guidelines:
•
Give identifiers semantic meaning and make them easy to read (exampl
es 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.
•
Reasonably good amount of comments
should be added in your program so that it is easy
for other people to understand it. Please see the comment style in the textbook.
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 accordingl
y from assignment to assignment.
(If not,
–
1 Pt)
//***********************************************************
// Name:
your name
// Title:
title of
the source file
// Author: (if not you, put the name of author here)
// Description:
Write the description in your words
.
// Time spent:
how long it took you to complete the assignment
// Date:
the date you programmed
//*******************************
***************************
Part 1
: Writing Exercise
: (
5
pts)
The following are the exercise
s about the
loop
s
in Java.
Write the answers in a comment block
before the code of Part2.
a.
What are the three required expressions of a for
–
loop?
(
1
pts)
b.
Consider the following code.
This code was written to generate the output as shown in
Output
2. However, there is an error in this code
.
Correct the code so that it is able to
generate the desired output.
(2 pts)
int count = 0;
while (count < 10)
{
System.out.println(“count:” + count);
}
Output 2
count:0
count:1
count:2
count:3
count:4
count:5
count:6
count:7
count:8
count:9
c.
What is the output of
the following code?
(2 pts)
int i =0;
do
{
System.out.println(“i is : ” + i);
i++;
}while(i < 5);
Note:
The answers
to the questions (a through c
) above should be typed in the block of
comments i
n the
java file
such as;
//
a) The
three requirements of a loop are
…
//
b) The
corrected code
is
…
//c) The output of the given code is …
Part
2: Programming (15
pts)
Write a Java program called
Assignment4
.java
.
There are two tasks in this assignment.
Your program will ask for user choice based on which it will switch between the two tasks.
Aft
er performing the computations of the selected task, your program should ask the
user if the user wants to do another execut
ion
. If the user opts to
continue, then your
program
should loop again and d
isplay the option for two tasks, else it
should
terminate
.
(3 pts)
Read the instructions carefully about each task.
T
he development process
of each task
is
decomposed into two steps. Follow the instruction one by one. Don’t go to the next step if
your program does not return the proper output in a step.
Task 1:
G
enerate a multiplication table.
Step1
:
The first step is to read input from the user.
The input should be a single line with
two positive numbers such as “4 3”.
The inputs are separated by a space.
Make sure
the user inputs a positive integer for the number and table
–
Size, or else prompt the
user again to do so
(as shown in Output
1
)
.
(3 pts
)
Output 1
:
Please enter a number
and tableSize
:
–
3 4
Please enter a number
and tableSize
:
Step2 :
Generate a multiplication table for the entered number of the required tableSize.
Your
output should be well formatted
(as shown in Output 2
)
. You
might want to make use
of tab spaces for formatting
.
(3 pts)
Output
2
:
Please enter a number
and tableSize
:
8
9
1 * 8
=
8
2 * 8
=
16
3 * 8
=
24
4 * 8
=
32
5 * 8
=
40
6 * 8
=
48
7 * 8
=
56
8 * 8
=
64
9
* 8
=
72
Task 2:
Display
a p
attern of stars ‘*’ and lower case character ‘o’ in a proper format as suggested below.
Step1
:
The first st
ep is to
read the user
input
.
If
the
user
input
is invalid
(not integer or not
positive),
the program display
s
the message below and
break out of the switch
–
case
(as shown in Output 3 and 4).
***
Invalid number of rows
***
(3
Pts)
Output 3
:
Please enter number
of rows
:
–
6
*** Invalid number of rows ***
Output 4
:
Please enter number
of rows
:
Q
***
Invalid number of rows ***
Step2
:
C
rea
te nested loops to print out a pattern of stars and lower case ‘o’
.
Your output
should be well formatted (as shown in Output
5
).
(3
Pts)
Output
5
:
Please enter number
of rows
:
9
*
*o*
*o*o*
*o*o*
o*
*o*o*o*o*
*o*o*o*o*o*
*o*o*o*o*o*o*
*o*o*o*o*o*o*o*
*o*o*o*o*o*o*o*o*
Example Execution:
The following
are
example
input
s
and
output
s
.
The user inputs are shown in
bold
.
Example Execution #1
1.
Generate a multiplication table
2.
Display a pattern of stars and
character ‘o’
Your choice:
1
Please enter a number
and tableSize
:
3 4
1 * 3
=
3
2 * 3
=
6
3 * 3
=
9
4 * 3
=
12
Do you want to continue? (Yes/No):
Yes
1.
Generate a multiplication table
2.
Display a pattern of stars and character ‘o’
Your choice:
Example Execution #2
1.
Generate a multiplication table
2.
Display a pattern of stars and character ‘o’
Your choice:
2
Please enter number
of rows
:
6
*
*o*
*o*o*
*o*o*o*
*o*o*o*o*
*o*o*o*o*o*
Do you want to continue? (Yes/No):
No
Some Useful Methods for completing this assignment:
Class : Scanner
Methods : next(), nextLine(), nextInt(), hasNextInt()
Class : String
Methods: equals(), equalsIgnoreCase()
Use only the Java statements that have been covered in class to date.
DO NOT
use an
y
other items out of the Chapter 1
–
4 (Array, Array List, exit() etc.)
.
If in
doubt, ask.
If you use
them, then you lose the points of task. Complete each step one by one. Don’t copy any code
developed by others. Don’t give your code to others.
Don’t use any algorithm, which you cannot
understand. Your assignment file is checked by the MOSS (by Stanford Univ.), which is a
program to detect cheatings.
Submit your homework by following the instructions below:
*************************************
********************************************
•
Go to the course web site (
my.asu.edu
), and then click on the on
–
line Submission tab.
Login to the page by typing your email and password
•
Submit your
Assignment4.java
file on
–
l
ine. Make sure to choose Hw4 from drop
–
down
box.
•
Assignment
4
.java should have the following, in order:
o
In comments, the assignment Header described in “Important Note”
o
Answer to questions in Part 1
o
The working Java code
for Part 2
o
The Assignment4.java file must compile and run as you submit it. You can
confirm this by viewing your submission results.
Important Note:
You may resubmit as many times as you like until the deadline, but we will only
mark your last submission.
