Data Organization Programming Assignment 2

CS 241L - Data Organization

Programming Assignment 2
Total points: 100

In this programming assignment, you will print formatted strings using the
printf function and work with numeric data types.
Part 0: Extracting files from tarball
The programming assignment is given to you as a compressed tarball. In order
to extract the files from this tarball use the command
$ tar -xvf programming assignment 2.tar.gz
This will create a folder with name ‘Programming Assignment 2’ in your
current directory. The contents of this folder are the following items:
• ‘Programming Assignment-2 F22.pdf’
• madLib.c
• intPlay.c
Part 1: Piano keys
On a piano, a key has a frequency, say f0. Each higher key (black or white) has
a frequency of f0 ∗ r
n, where n is the distance (number of keys) from that key,
and r is 2(1/12)
.
Given an initial key frequency (an integer), output that frequency and the
next higher key frequencies. Output each floating-point value with two digits
after the decimal point, which can be achieved as follows:
printf("%0.2lf", yourValue);
Ex: If the input is: 440.0 (which is the A key near the middle of a piano
keyboard), the output is:
440.00 466.16 493.88 523.25 554.37
Note: Use one statement to compute r = 2(1/12) using the pow function
(remember to include the math library). Then use that r in the subsequent
statements that use the formula fn = f0 ∗ r
n with n being 1, 2, 3, and finally 4.
1
Instructions
1. Create a file named piano keys.c.
2. Using the scanf function, read an integer from standard input as follows:
scanf("%d", &initialKey)
For the latter, don’t forget to include the standard IO library with #include
<stdio.h>.
3. Implement the necessary code compute and print the above sequence of
frequencies from the given integer value read from standard input.
4. We will use this command to compile your code:
$ gcc piano keys.c -Wall -Wuninitialized -Wconversion -o a.out
-lm -std=c99
Part 2: Mad Libs
Mad Libs are activities that have a person provide various words, which are
then used to complete short stories in unexpected (and hopefully funny) ways.
Instructions
1. Edit the file madLib.c provided to you to read the needed values from
standard input, that the existing output statement(s) in madLib.c can
use to output a short story.
Ex: If the input is:
Eric Chipotle 12 cars
The output is
Eric went to Chipotle to buy 12 different types of cars.
2. We will use this command to compile your code:
$ gcc madLib.c -Wall -Wuninitialized -Wconversion -o b.out -std=c99
Part 3: Playing with Integers
1. Compile the file intPlay.c provided to you in this assignment with the
command:
$ gcc intPlay.c -std=c99 -o iPlay
2. Run iPlay and redirect its output to a file, so that you can save that
output.
$ ./iPlay > intOutput
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3. Create a file intPlayAnswers to place your answers to the four questions
and submit the pdf version of this file. You could handwrite it and scan
into a pdf or you may use your favorite text editor and convert it into pdf.
Each question refers to the printf it is associated with. You need to have
the output handy so that you can refer to it when answering the questions.
What to submit:
Submit a tarball to Canvas with name <Your-Student ID> 2.tar containing
the following files:
Your file piano keys.c
Your changes to madLib.c
Your file intPlayAnswers.pdf
intOutput
The command to archive these four files is
$ tar -cvf <Your-Student ID> 2.tar
Grading Rubric:
If any of your C programs report errors or warnings using the respective commands stated the points given for the assignment will be zero. Otherwise the
following rubric will be used:
+5 pt: Your submission consists of single tarball as specified in the ‘What
to submit section.’
+5 pt: Your C files follows the class coding style.
+30 pt: The program a.out compiled from your file piano keys.c passes
different local diff tests.
+30 pt: The program b.out compiled from your file madLib.c passes
different local diff tests.
+20 pt: Your answers provided in the file intPlayAnswers.c are correct.
+10 pt: The file intOutput passes a diff test.
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