How to stop a while loop

Question

This while loop never ends. For example, when i enter a wrong password it will keep on going to the \"incorrect password\" part over and over again.

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Answer 1

You are trying to check for the username and password from the user and compare with all the usernames and passwords in the file.
Your approach seems fine. But you are printing "Invalid username..." after each comparison, not comparing all the usernames in the file. Hence move this output outside else block and place it in the while loop.

infile checks each line separately.

And also check the end of file.If the username and password are not found till the end of file, then print "Invald username" and provide the user to enter another set of name and password

Hope this helps!!