Unless the exam allows notes, it can make sense to forbid using programs that are already stored and require to write the program during the time needed for the

Unless the exam allows notes, it can make sense to forbid using programs that are already stored and require to write the program during the time needed for the exam if you want to do that (even to program it to show the work if you want to add that into the program too; I think someone once did this), then it can be OK to allow it, I suppose.