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Please read the following instructions carefully before submitting assignment.

It should be clear that your assignment will not get any credit if:


  • The assignment is submitted after due date.
  • The submitted assignment does not open or file is corrupt.
  • Assignment is copied(partial or full) from any source (websites, forums, students, etc)





The objective of this assignment is:

  • Learn to code, edit, compile and execute C++ program.
  • Learn to manipulate and navigate through text files.
  • Learn to create and use user defined functions.
  • Learn to use string manipulation functions.



  • Code should properly be indented and well commented.
  • Follow C/C++ naming conventions while using variables, functions etc.
  • Use only Dev-C++ for this assignment. If you are using any other tool then mention it at top of your code file as comments.


Assignment Description


In this assignment, you are required to write c++ code that will protect the provided text file using the protection mechanism given in guidelines. It will also check the security of file and if any change is made in the contents of protected file, it will point out the file as changed.


Protection mechanism:

The program will protect the file by generating a protection key on the basis of contents of the file. The key will be saved at the end of the file with “%” symbol as prefix. This key will be used to detect either the file contents are changed or not e.g. if file contents are changed the new key generated will not match the existing one, leading to conclusion that file contents have been changed.


Solution guidelines

The program should operate in following sequence.

  • Program will prompt the user to enter the file name in current directory.
  • System will show a menu with two options:
    • Protect the file
    • Check security status
  • In case user selects the first option (i.e. protect the file), the system will perform the following steps:
    • Read the file
    • Check if the file is already protected or not.
    • In case if file is not protected, program will protect it by the protection mechanism defined above.
    • If file is already protected, system will display appropriate message and exit.
  • If user selects the second option (i.e. check security status), the system will perform following steps:
    • Read the entire file and if key does not exist (i.e. file is not already protected), program will display the message to protect the file first and display menu.
    • If file is already protected, the system will read the contents along with the already existing key. On the basis of contents read, a new key will be generated. If this new key and the existing one (read from the file) do not match, it means that the contents of protected file are changed and vice versa.


Important note

A text file (data.txt) is attached with assignment, use it for protection checking. Video file (Output-Demo.mp4) of desired function is also attached with assignment. Watch the demo video carefully to understand the required functionality (output) of program. Your program should work as per functionality performing in demo video file. You do not need to send text file with your solution. Just upload .cpp file from your LMS account. For any query related to assignment no. 3 contact us at cs201@vu.edu.pk.


You are required to submit your solution C++ program through LMS i.e. .cpp file. 

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Replies to This Discussion

i m student of IT and in 1st smestar i really want to learn programming  i m really so worry about it can anyone help me to understand the programming  

@ayeeza i think you will learn 201 in 2nd semester 

why you are worried about it now?

but i want to learn it now i must be able to complete my assignment without any help but i m not :(  i can not do it myself :(

Don't worry Ayeeza,

You can really do it. just try to concentrate on all of it's lectures whose are mentioned in course overview and take all of them properly. after that, if you will still have some questions then you should consult with google & with your course instructor as-well through MDB or through e-mail. http://www.cplusplus.com/reference/ this site will help you a-lot as-well.

Good luck

ayza do not worry about it.you can learn simply try it if face any problem you may conern..:)

yes brother i want to know.... please brief me.

plz tell me logic n algorithm of the assignment


M Ilyas | (BSCS 2nd) email ,cell no sharing etc is not allowed at the site.thanks for understanding 

anyone in BSCS from Gujrat near city please contact PM me i want to join him for combine study..

any body give the idea .........


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