This assignment is related to process scheduling, but you do not have to know
anything about process scheduling to do this assignment.
The connection of this assignment to process scheduling will become
clear in Assignment 2.
You will be given an input sequence of exactly
7 integers. From this you will produce two output strings consisting
of the letters R, w and r. You will also produce two integer values
giving the number of times r occurs in the first string and the number
of times r occurs in the second string. Lastly you will produce two floating
point numbers. The first of these is the average of the two output
integers and the second is the total number of R's in the two strings
divided by the length of the longer string.
You will write a single C program that takes the 7 input values as
command line parameters. The program should start by checking that there
are exactly 7 parameters and exit with an appropriate
error message otherwise. If the number of command line parameters is
correct, the program will print your name on a line in the form:
Assignment 1 program was written by ...
and then output 7 input values.
It will then display 5 additional lines:
a blank line, a heading, the two output strings (the second
directly under the first) and the four numeric values.
Produce a single makefile
for compiling all of the
programs in this assignment. A sample makefile can be found
In writing your programs, follow the programming style guidelines
Make sure you understand the statement of the each part before writing any
code for that part.
For each part you will be given information about how to produce the
output from the input sequence.
You will run the program with appropriate
input of your choosing to test to see if it is working.
Save the output generated to be handed in with your assignment.
You will produce two source files, assign1.c
The first will contain your main program. The second will contain functions
implementing most of the assignment. In each part you will add to the source
files keeping the previous capabilities.
This is just to get you started. You do not have to hand in anything for
this part for Assignment 1, but you will be sending me and the grader an email with the output
generated as part of Assignment 0.
Create a directory called assign1
for this assignment.
Write a main program called assign1-0.c
This program takes exactly 7 integer command line parameters.
It should check for the correct number of command line parameters,
assume that all are integers, print a line containing your name and
a line containing the values of the parameters.
The output should be in the form:
Assignment 1 program was written by Dakai Zhu
inputs: 0 2 4 6 7 8 9
If the number of parameters is incorrect, print an appropriate message
The main program should then create two arrays of characters that will be
large enough to hold the character string you will be creating.
The maximum size of any of the strings will be the sum of the last six
command line parameters. If an error occurs in creating these arrays,
exit the program with an appropriate error message. Otherwise call two
functions, one to create the strings and one to print them out as follows:
void part0(char *s1, char *s2);
void display(char *heading, char *s1, char *s2);
These two functions should be put in the file
Put prototypes for these in pslibrary.h
and have assign1-0.c
For this part of the assignment use the heading: "Part 0\n"
function will just copy the following strings into
the two parameters:
Note that part0
ignores all of the input parameters (s1 and s2 here).
Call the program with parameters that are large enough so that the main program
will allocate enough space for these strings.
function that you write for this part will be used
in the next part of this assignment and in future assignments.The display
function prints only to standard out and does the following:
- Print a blank line to standard output.
- Print the heading.
- Print the first string on its own line.
The first string is the second parameter to display.
You may assume that the heading ends with a new line so that the
first string is printed at the start of a line. After printing
this string, print a newline so that next string starts directly
- Print the second string on its own line.
After writing the string to standard output, output a newline.
- Print 4 numeric values all on a single line, separating consecutive values with a single blank.
- The number of 'r' characters in the second parameter.
- The number of 'r' characters in the third parameter.
- The average of these two number, displayed with one decimal place.
- A floating point number number displayed with 5 decimal places.
This values is the total number of 'R' characters in the second
and third parameters divided by the length of the longer of these
Run Part 0 and save the output generated. You will send this to me and the grader in an
email as part of Assignment 0.
Note: When you run Part 0, make sure that the command line parameters are large
enough so that there is enough room for the strings.
Write a function in pslibrary.c
takes two string parameters and 6 integer parameters.
It fills in the strings for the first two
parameters as described as follows. Suppose the function is called with
fcfsa(s1, s2, x1, y1, z1, x2, y2, z2);
The first string, s1
, will consist of a x1
followed by y1
w's, followed by 0 or more r's, followed by
The number of r's will be described later.
The second string, s2
, will be consist of x1
r's, followed by
R's, followed by y2
w's, followed by 0 or more r's,
followed by z2
The number of r's in each string will determined by the following conditions:
- The two strings strings will not have R's in the same position.
- No string will have an r in the position that the other string has an r or w.
- The first string will have the smallest number of r's that will allow it to satisfy conditions a) and b).
- The second string will have the smallest number of r's that will not contradict a), b), or c).
using the last 6 integer parameters
(ignore the first integer parameter) instead of calling part0
It will then call display
With the input sequence: 0 4 2 7 3 6 5
the output generated by display
1 5 3.0 1.00000
With the input sequence: 0 4 9 5 6 3 7
the output generated by display
0 9 4.5 0.88000
Test your program with inputs you have developed
Then run the program with each of the following six tests.
For each, save the
output in a file and print the output, each on a single page.
Label each one as Test 1, Test 2, Test 3, Test 4, Test 5, or Test 6.
3 8 7 3 6 3 2.
3 8 7 3 6 7 2.
4 8 7 3 6 1 2.
3 3 3 4 2 1 2.
3 3 2 3 2 1 2.
3 5 2 5 4 1 1.
This will be turned in with your assignment. Put the page number of each of
these on the cover sheet under Final test output 1
A Final Test:
Get a copy of this
Compile this program with you pslibrary
cc -o runalla runalla.c pslibrary.c
Then execute runalla
. It should create a file called fcfsa.all
ls -l fcfsa.all
and include the output with your assignment.
file should have 2,000,001 lines and 2,000,003 words.
You should delete this large file after you have saved the above output.
cover sheet for handing in your
assignment. Please also commit your code and cover sheet to the blackboard.
Be sure to fill in your collaborations on the back of the cover sheet.
Based on materials provided by Prof. Steve Robbins.