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AOA. any one know about Assignment 03 of cs201 plz share it

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Dear Students!

Please note that graded assignment no. 3 of CS201 has been uploaded. Due date to upload solutions is 10-07-2015 (Friday 10-July-2015).

All the instructions to solve the assignment are there in assignment file, so make sure that you read all these instructions and upload your solutions before due date. 


You need to install Winrar to extract compressed assignment file. You can download Winrar from the following link


For any query related to assignment, contact at:



Instructor CS201

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


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

else use kr sakty hn?

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. 

me tooo ka b yahi hal hai...

yar assingnment ha kay koi batay ga  

plz help me


error in  one line . 

show me the error

ifstream myfile(file); this statment gives error in my system ..I am using Dev-C++ 5.9.2 version ...please help me I always get this error.

show me the error

better if you use

ifstream myfile;;


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