C Programming LAB 2

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CST8234 – C Programming
By completing this lab, you will learn to:
• Printing to console and asking the user for input.
• Reading input from the user.
• Formatting printf string
• Bonus: loop control flow.
North American telephone numbers structured as follow:
3-digit area code + 3-digit central office code + 4-digit subscriber
For example, Algonquin College number is “(613) 727-4723”, where
the area code is “613”, the central office code is “727”, and the
subscriber is “4723”. Neither the area code or the central office code
will start with the digit “0” or “1”. See
North_American_Numbering_Plan#Modern_plan for details.
However, despite the consistent structure, people write the phone
numbers in a number of different ways. For example, “(613) 727-4723”,
“613-727-4723”, or “613.727.4723”. Yet, the presentation always
follows the standard structure for phone numbers, so you don’t see a
phone number written as “61-37-274-273”.
It is also common to ignore the area code. For example, Algonquin
college number would be given as “727-4723”.
Yet, because the presentation is usually an application or a user
preference, and for greater consistency, applications that store/show
phone numbers usually saves them in a canonical representation with
all formatting removed (e.g., “6137274723”) and then re-apply the
formatting when the number has to be presented to the user.
In this lab, you will write a program that will read a canonical phone
number form the user, then prints it back to the properly formatted in
the for “xxx-xxxx”. You program must achieve the following
1. If the user enters the number “0”, the program should exit
2. If the user enters any phone number that is grater than or less than
7-digits, the program should report an error back. In other words,
only valid 7-digit numbers are accepted, so entering an 8-digits
number or 5-digits number for example should trigger an error
3. If the users enters an invalid phone number, then the program should
report the error to the user. Hint: central office code doesn’t start
with “0” or “1”.
4. If the user enters a valid 7-digit numbers, then the program should
format the phone number in a hyphenated 7-digit representation, i.e,
“7274723” will become “727-4723”.
5. Bonus: You get 2 bonus marks if the program continue looping
infinitely until the user explicitly enters “0”.
The following shows figure shows a sample solution output
Sample solution output
There are many ways to solve this problem, one of which involves
simple math to separate the central office code from the subscriber
code. Yet, any solution that achieves the above requirements will be
• You can work in a group of maximum 2 students to complete this
lab. Individual work is also accepted.
• You are required to show your work during the lab time to the
• You must submit the source code for the program you wrote. Add all
your files under a folder call “lastName-firstName-Lab2”, then Zip the
file and submit the zip file only. Make sure to submit all files required
to compile and run the program on the instructor machine with any
• DON’T submit any extra file please. For example, the binary file (AKA
object or output) files like .exe or .o.
• If working in a group, add a Readme.txt file that contain each
student name and student number.
• Brightspace is configured to keep the last submission only. Please
complete all steps required to finish the lab before your first
• All submission must be done on the main Brightspace shell,
19F_CST8234_010_ALL or 19F_CST8234_020_ALL, not the lab
section one.


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