CIS 1500 – Assignment 4 | Complete Solution

Write a complete C program for the following problem and submit to the dropbox for Assignment
4. Make sure you submit the .c file, not the executable. Your programs
must compile successfully with the command: gcc -Wall -std=c99 your file.c.
The CSV (comma separated values) file format is a very common way to export data from
spreadsheet and web-based applications. In these text files, each line in the file represents
a row of data, where within each line, the di↵erent data fields are separated by a comma.
For this problem you will be given a CSV file grades.txt containing assignment grades for
every student in a given class. As an example, a CSV file for a class with 4 students and 3
assignments may look like:
8.5, 10.5, 90.5
50, 99, 97
88, 88, 100
88.5, 99, 0
Your task is to write 3 functions to compute and return:
. the average grade
. the maximum grade
. the number of students who failed (< 50%) (use 49.9 in your comparison!)
for a given assignment (passed as one of the parameters). You may assume:
• every assignment is out of 100,
• each mark in the input file is rounded to the nearest half mark,
• there are between 1 and 100 assignments in the course,
• there are between 1 and 1000 students in the class,
• the file is formatted correctly.
To simplify reading the input file, your executable must take two command line parameters
specifying the number of students and the number of assignments in the class. If the executable
is a.out, and the input file has 4 students and 3 assignments as above, you would
call your program as: ./a.out 4 3. If an incorrect number of command line arguments is
given, your program should output:
usage: ./a.out num students num assignments
1
NOTE: If the command line arguments do not match the input file, then your program is
not expected to work, and appropriate error messaging is not required.
To store the grades, declare a global variable as follows: float grades[1001][101]; (Using
1001 instead of 1000 allows you to start your indices at 1 if you wish). Since this 2-dimensional
array is global, you do not have to pass it into your functions. This should be your only
global variable. As an example, you may want to store the grade of the 4th assignment of
the 9th student in grades[9][4].
Finally, you must output grades data back to the screen in CSV format to verify you read
the file correctly. Given the earlier CSV data, your output should be formatted as follows.
Be mindful of the nice alignment of the values. The average should be rounded to one
decimal place.
==================================
Student grades from the input file
==================================
8.5, 10.5, 90.5
50.0, 99.0, 97.0
88.0, 88.0, 100.0
88.5, 99.0, 0.0
==============
Ass # 1 stats
==============
avg = 58.8
max = 88.5
fail = 1
==============
Ass # 2 stats
==============
avg = 74.1
max = 99.0
fail = 1
==============
Ass # 3 stats
==============
avg = 71.9
max = 100.0
fail = 1