Study resource
Context-free languages common mistakes
Study Context-free languages with curriculum-aligned Common Mistakes resources, practice links, and exam-focused support.
At a glance
common mistakes
Resource type
Topic
Context-free languages
AqaA LevelComputer ScienceTheory of computation
Common mistakes
Forgetting the stopping case
Writing a recursive BNF rule without an alternative that stops the recursion.
Fix itInclude a base alternative, such as a single terminal or empty, so that a complete string can be generated.
Related topics