Learning to look beyond the symptoms of a problem to identify the root cause is an important skill. Bugs in a program are sometimes the result of careless mistakes, but at other times, they reflect a fundamental misunderstanding of some concept.
Suppose that a friend has been trying to determine why his file processing program is not working correctly. You notice that he is passing file objects to functions by value. In addition to simply telling your friend that file parameters need to be passed by reference, what can you tell him that will help him understand why files need to be passed by reference?
Suppose now that you need to demonstrate this bug to other people. Bugs usually occur in the context of a larger program, which can make it difficult for a person unfamiliar with the program to understand what is happening. Write a program that is as short as possible but still has the file-passing bug.
We need at least 10 more requests to produce the solution.
0 / 10 have requested this problem solution
The more requests, the faster the answer.