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School of Computer Science, McGill University
COMP-206 Introduction to Software Systems, Winter 2020
Mini Assignment 5: C Programming - Functions and File I/O
This is an individual assignment. You need to solve these questions on your own. Use the discussion
forum on Piazza if you have any questions. You can also reach out to the course email address,
utilize TA/Instructors office hours as necessary. Late penalty is -5% per day. Even if you are late
only by a few minutes it will be rounded up to a day. Maximum of 2 late days are allowed.
You MUST use mimi.cs.mcgill.ca to create the solution to this assignment. You must not use your
Mac command-line, Windows command-line, nor a Linux distro installed locally on your laptop. You can ssh or
putty from your laptop to mimi.cs.mcgill.ca, or you can go to the third floor of Trottier and use any of those
labs to ssh to mimi to complete this assignment. All of your solutions should be composed of commands that are
compilable/executable in mimi.cs.mcgill.ca.
Questions in this exercise requires you to turn in one C program. Instructors/TAs upon their discretion may ask
you to demonstrate/explain your solution. No points are awarded for commands that do not execute at all or programs
that do not compile in mimi. (Commands/programs that execute/compile, but provide incorrect behavior/output
will be given partial marks.). All questions are graded proportionally. This means that if 40% of the question is
correct, you will receive 40% of the grade.
Please read through the entire assignment before you start working on it. You can loose up to 3
points for not following the instructions.
Unless otherwise stated, all the names of the scripts and programs that you write, commands, options, input
arguments, etc. are implied to be case-sensitive.
Total Points: 20
Ex. 1 — A Banking System Application
In this exercise, you will create a C program, bankapp.c to implement a simple banking application.
Your application provides three capabilities: (i) Add an account number, (ii) Make a deposit, (iii) Make a withdrawal.
All of your banking data is stored in a CSV file bankdata.csv which has the following format. You can use vi to
create a sample data file of your own for testing purposes.
AC,2023,Jane Smith
TX,2023,2020-02-10,1023.34
AC,5023,Sally Long
TX,2023,2020-02-10,-103.34
TX,5023,2020-01-15,78.00
As can be seen above, there are two kinds of records in this CSV file. (i) Account records, indicated by AC in the first
field, followed by a 4 digit account number, followed by the name of the account holder (max 30 characters long).
(ii) Then there are transaction records that are indicated by TX in the first field, followed by the account number,
transaction date in YYYY-MM-DD format, followed by the amount of money deposited or withdrawn (negative values
for the latter).
1.Use vi to create a C program source file bankapp.c
2.(1 Point) The program should include a comment section at the beginning that describes its purpose (couple
of lines), the author (your name), your department, a small “history” section indicating what changes you did
on what date. The code should be properly indented for readability as well as contain any additional comments
required to understand the program logic.
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3.(1 Point) The source code should be compilable by (exactly) using the command gcc -o bankapp bankapp.c
4.(1 Point) The compilation step should not issue any warnings.
5.(1 Point) All the error messages must be printed to stderr and not stdout.
6.(2 Points) Your program’s usage is as follows.
To add a new account
$ ./bankapp -a ACCTNUM NAME
To make a deposit
$ ./bankapp -d ACCTNUM DATE AMOUNT
To make a withdrawl
$ ./bankapp -w ACCTNUM DATE AMOUNT
Any other attempt must throw a usage error. You may however, chose to ignore the extra arguments
passed to any of the above valid options at your discretion and continue processing. The exit code
for invalid usage of your program should be 1.
$ ./bankapp
Error, incorrect usage!
-a ACCTNUM NAME
-d ACCTNUM DATE AMOUNT
-w ACCTNUM DATE AMOUNT
$ echo $?
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In case the user passed a valid option but did not pass sufficient arguments to process it, provide a more
customized error message.
$ ./bankapp -a 1024
Error, incorrect usage!
-a ACCTNUM NAME
$ echo $?
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$ ./bankapp -d 1024 2010-02-12
Error, incorrect usage!
-d ACCTNUM DATE AMOUNT
$ echo $?
1
$ ./bankapp -w 1024
Error, incorrect usage!
-w ACCTNUM DATE AMOUNT
$ echo $?
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7.(1 Point) Your program should read the data contents from a CSV file, bankdata.csv. It must be present in
the current directory. If the program cannot find it, it must thrown an error and terminate with code 100.
$ ./bankapp -a 1024 "John Smith"
Error, unable to locate the data file bankdata.csv
$ echo $?
100
8.(2 Points) Your program must allow new accounts to be added. These accounts will be appended to the data
file bankdata.csv.
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$ ./bankapp -a 1024 "John Doe"
$ tail -1 bankdata.csv
AC,1024,John Doe
If the account number already exists (as indicated by the AC records), then the program should not add it,
instead throw an error message to indicate this and terminate with error code 50.
$ ./bankapp -a 1024 "John Doe"
Error, account number 1024 already exists
$ echo $?
50
9.(3 Points) Your program should facilitate deposits to an existing account. A transaction record indicating the
amount of money to be deposited is then appended to the data file.
$ ./bankapp -d 1024 2020-02-12 334.52
$ tail -1 bankdata.csv
TX,1024,2020-02-12,334.52
If the account does not exist, it should throw an error message and terminate with code 50.
$ ./bankapp -d 1025 2020-02-12 334.52
Error, account number 1025 does not exists
$ echo $?
50
10.(4 Points) Your program should facilitate withdrawals from an existing account. A transaction record indicating
the amount of money that is withdrawn is then appended to the data file.
$ ./bankapp -w 1024 2020-02-14 20.00
$ tail -1 bankdata.csv
TX,1024,2020-02-14,-20.00
If the account does not exist, it should throw an error message and terminate with code 50.
$ ./bankapp -w 1025 2020-02-14 20.00
Error, account number 1025 does not exists
$ echo $?
50
If the account does not have enough balance, it should display an error message, and also indicate the current
balance in the account. Terminate with code 60. You should be able to compute the existing balance on the
account by adding up all the deposits and withdrawals on the account. Make sure that the amounts you print
on the screen has only 2 decimal places.
$ ./bankapp -w 1024 2020-02-15 2020.00
Error, account number 1024 has only 314.52
11.(1 Points) Remember to terminate the successful execution of your program with code 0.
12.(2 Point) Your program must not crash because the data file is empty (or at any other situation). Instead it
should do the proper processing according to the scenarios already described earlier. (i.e, add a new account,
let the user know the account does not exist for a transaction, etc.).
13.(1 Point) Your program should include some function definitions of your own. At a minimum, you should have
one function per operator. You are free to have additional functions in your program.
** Important ** If your program “hangs” / is stuck while executing it through the tester script and requires TAs
to interrupt it, you will loose 4 points. If your program causes corruption of the data file for any of the test cases,
you will loose 4 points.
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WHAT TO HAND IN
Turn in the C program source code bankapp.c named properly. You do not have to zip the file. The file must be
uploaded to mycourses. DO NOT turn in the executable bankapp or your testing CSV file bankdata.csv. TAs will
compile your C program on their own as indicated in the problem descriptions above.
MISC. INFORMATION
There is a tester script mini5tester.sh that is provided with the assignment that you can use to test how your
program is behaving. TAs will be using the exact same tester script to grade your assignment.
$ ./mini5tester.sh
However, it is recommended that when you start writing your program, test it yourself first with the above
examples. Make a test case for each scenario by creating your own bankdata.csv file that has the format mentioned
above. Once you are fairly confident that your program is working, you can test it using the tester script.
You can compare the output produced by running the mini tester on your C program to that produced by the
mini tester on the solution programs which is given in mini5tester.out.txt.
FOOD FOR THOUGHT!
The following discussion is meant to encourage you to search independently for creative and optimal ways to perform
rudimentary tasks with less effort and/or make your program robust and sophisticated. It does not impact the points
that you can achieve in the above questions.
• As we know, I/O is a slow process and can be costly if you have very large files. Can your program make
decisions in certain scenarios (both fail cases and successful cases) without having to read all of the data file?

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