handout #22
CSE142—Computer Programming I
Programming Assignment #7
due:
Tuesday,
This assignment will give you practice with arrays and producing an external output file. You are going to write a program that processes an input file of data for a personality test known as the Keirsey Temperament Sorter. The Keirsey personality test involves answering 70 questions each of which have two answers. We will refer to them as the “A” answer and the “B” answer. People taking the test are allowed to leave a question blank, in which case their answer will be recorded with a dash (“-”).
The input file will contain a series of line pairs, one per person. The first line will have the person’s name (possibly including spaces) and the second line will have a series of 70 letters all in a row (all either “A”, “B” or “-”). Your job is to compute the scores and overall result for each person and to report this information to an output file.
The Keirsey test
measures four independent dimensions of personality:
Extrovert versus
Introvert (E vs I): what energizes you
Sensation versus iNtuition (S vs N): what you
focus on
Thinking versus Feeling
(T vs F): how you interpret what you focus on
Judging versus
Perceiving (J vs P): how you approach life
Individuals are categorized as being on one side
or the other of each of these dimensions. The corresponding letters are
put together to form a personality type. For example, if you are an
extravert, intuitive, thinking, perceiving person then you are
referred to as an ENTP. Usually the letter used is the first letter of
the corresponding word, but notice that because the letter “I” is used for
“Introvert”, the letter “N” is used for “iNtuition.”
Remember that the Keirsey
test involves 70 questions answered either A or B. The A
answers correspond to extravert, sensation, thinking and judging (the left-hand
answers in the list above). The B answers correspond to introvert,
intuition, feeling and perceiving (the right-hand answers in the list
above). For each of these dimensions, we determine a number between 0 and
100 and indicate whether they were closer to the A side or the B side.
The number is computed by figuring out what percentage of B answers the user
gave for that dimension (rounded to the nearest integer).
Let’s
look at a specific example. Suppose that someone’s answers divide up as
follows:
Dimension |
# of A answers |
# of B answers |
% B |
Result |
Extrovert/Introvert |
1 |
9 |
90% |
I |
Sensing/iNtuition |
17 |
3 |
15% |
S |
Thinking/Feeling |
18 |
2 |
10% |
T |
Judging/Perceiving |
18 |
2 |
10% |
J |
These numbers correspond to the answers given by
the first person in the sample input file (“Betty Boop”).
We add up how many of each type of answer we got for each of the four
dimensions. Then we compute the percentage of B answers for each dimension.
Then we assign letters based on which side the person ends up on for each
dimension. In the Extrovert/Introvert dimension, for example, the person
gave 9 “B” answers out of 10 total, which is 90%,
which means they end up on the B side which is “Introvert” or I. In the
Sensing/iNtuition dimension the person gave 3 “B”
answers out of 20 total, which is 15%, which means they end up on the A side
with is “Sensing” or S. The overall scores for this person are the
percentages (90, 15, 10, 10) which works out to a
personality type of ISTJ.
Some people will end up with a percentage of 50
in one or more dimensions. This represents a tie, where the person
doesn’t clearly fall on either side. In this case we use the letter “X”
to indicate that the person is in the middle for this particular
dimension. The last two entries in the sample input file end up with X’s
in their personality type.
Take a moment to compare the sample input file
and the sample output file and you will see that each pair of lines in the
input file is turned into a single line of output in the output file that
reports the person’s name, the list of percentages and the personality
type. You are required to exactly reproduce the format of this output
file.
If you are interested in taking the personality
test yourself, you will find a link from the class webpage to an online form
with the 70 questions. Submit your answers by
To count the number of A and B answers for each
dimension, you need to know something about the structure of the test.
You will get the best results if you take the test without knowing about the
structure, so you might want to take the test first before you read what
follows. The test has 10 groups of 7 questions with a repeating pattern
in each group of 7 questions. The first question in each group is an
Introvert/Extrovert question (questions 1, 8, 15, 22, etc). The next two
questions are for Sensing/iNtuition (questions 2, 3,
9, 10, 16, 17, 23, 24, etc). The next two questions are for
Thinking/Feeling (questions 4, 5, 11, 12, 18, 19, 25, 26, etc). And the
final two questions in each group are for Judging/Perceiving (questions 6, 7,
13, 14, 20, 21, 27, 28, etc). Notice that there are half as many
Introvert/Extrovert questions as there are for the other three
dimensions. The seventy letters in the input file appear in question
order (first letter for question 1, second letter for question 2, third letter
for question 3, etc).
Remember that the user might leave a question
blank, in which case you will find a dash in the input file for that
question. Dash answers are not included in computing the
percentages. For example, if for one of the dimensions you have 6 A
answers, 9 B answers and 5 dashes, you would compute the percentage of B
answers as 9 of 15, or 60%.
You should round percentages to the nearest
integer. You can round by adding one-half and casting to an
integer. For example, if you have a variable of type double called
percentage, you can find the nearest integer as follows.
int percent = (int)(percentage + 0.5);
For this assignment you are to read from a file
called personality.txt and write your results to a file called personality.out. You generate an output file by
constructing an object of type PrintStream and
writing to it in the same way you write to System.out
(with print and println statements). See
handout #21 for an example.
You can read the user’s answers from the input
file using a call on nextLine(). This will read an entire line of input and return
it as a String. You can use the charAt method
of the String class to get the individual characters of this string, but
another nice approach is to call the String’s toCharArray() method.
For example, if you have a variable text of type String, you can convert it to
a character array by saying:
char[] letters = text.toCharArray();
One of the things to keep in mind for this program is that you are transforming data from one form to another. You start with a String that has 70 characters in it. You convert that to an array of 70 characters. You convert that into two sets of counters (how many A answers for each dimension, how many B answers for each dimension). You convert that into a set of percentages. And you finally convert that into a String that represents the personality type. If you work through this step by step, the problem will be easier to solve.
Notice that the letters “A” and “B” in the
sample input file sometimes appear as uppercase letters and sometimes appear as
lowercase letters. Your program must recognize them in either case.
You may assume that the input file has no errors. In particular, you may assume that the file is composed of pairs of lines and that the second line in each pair will have exactly 70 characters that are either A, B or dash (although the A’s and B’s might be in either uppercase form or lowercase form or a combination). You may also assume that nobody has zero answers for a given dimension (it would be impossible to determine a percentage in that case).
The sample input and output files provide just a
few simple examples of how this program works. We will be using a much
more extensive file for testing your program. As mentioned earlier, we
will include data from people in the class to make this file. We will
make the data file and its output available to students on Monday, 5/23.
Your program is likely to have the number “4” in several places because of the four dimensions of this test. You should introduce a class constant to make this more readable instead of using 4 itself. It won’t be possible, however, to change this constant to some other number and have the program function properly. The constant is helpful for documentation purposes, but it won’t make the program particularly flexible.
We will once again be expecting you to use good
programming style and to include useful comments throughout your program.
We are not specifying how to decompose this problem into methods, but we will
be grading on the quality of your decomposition. That means you will have
to decide how to decompose the program into methods. You should keep in
mind the ideas we have been stressing all quarter. You don’t want to have
redundant code. You don’t want to have any one method be overly
long. You want to break the problem down into logical subproblems
so that someone reading your code can see the sequence of steps it is
performing.
Your program should be stored in a file called Personality.java. You will need to include the files Scanner.java and personality.txt from the class web page
(under the “assignments” link) in the same folder as your program.
You can find out more about the Keirsey Temperament Sorter at http://www.keirsey.com.
Input file personality.txt
Betty Boop
BABAAAABAAAAAAABAAAABBAAAAAABAAAABABAABAAABABABAABAAAAAABAAAAAABAAAAAA
Snoopy
AABBAABBBBBABABAAAAABABBAABBAAAABBBAAABAABAABABAAAABAABBBBAAABBAABABBB
Bugs Bunny
aabaabbabbbaaaabaaaabaaaaababbbaabaaaabaabbbbabaaaabaabaaaaaabbaaaaabb
Daffy Duck
BAAAAA-BAAAABABAAAAAABA-AAAABABAAAABAABAA-BAAABAABAAAAAABA-BAAABA-BAAA
The frumious bandersnatch
-BBaBAA-BBbBBABBBBA-BaBBBBBbbBBABBBBBBABB-BBBaBBABBBBBBB-BABBBBBBBBBBB
Minnie Mouse
BABA-AABABBBAABAABA-ABABAAAB-ABAAAAAA-AAAABAAABAAABAAAAAB-ABBAAAAAAAAA
Luke Skywalker
bbbaaabbbbaaba-BAAAABBABBAAABBAABAAB-AAAAABBBABAABABA-ABBBABBABAA-AAAA
Han Solo
BA-ABABBB-bbbaababaaaabbaaabbaaabbabABBAAABABBAAABABAAAABBABAAABBABAAB
Princess Leia
BABBAAABBBBAAABBA-AAAABABBABBABBAAABAABAAABBBA-AABAABAAAABAAAAABABBBAA
Output file personality.out
Betty Boop: [90, 15, 10, 10] = ISTJ
Snoopy: [30, 45, 30, 70] = ESTP
Bugs Bunny: [20, 45, 15, 55] = ESTP
Daffy Duck: [100, 6, 20, 6] = ISTJ
The frumious bandersnatch: [86, 95, 75, 78] = INFP
Minnie Mouse: [67, 28, 32, 5] = ISTJ
Luke Skywalker: [89, 61, 26, 25] = INTJ
Han Solo: [80, 50, 45, 25] = IXTJ
Princess Leia: [80, 50, 50, 5] = IXXJ