What is an advantage of including comments or internal documentation in a program's code?

Question

BlackTom AI · Accepted Answer

Comments provide explanations and context in source code that are intended for people reading and maintaining the program, so they make the code easier to understand for humans.

1) Relevant knowledge points and concepts
- Comments/internal documentation are annotations in source code ignored by compilers/interpreters during execution.  
- Purpose: clarify intent, explain non-obvious algorithms, mark TODOs, document function inputs/outputs, and make maintenance and collaboration easier.  
- Impact on execution: because comments are removed or ignored by the parser, they do not change program behavior or runtime performance.

2) Step-by-step reasoning
- Identify what each answer option claims.
  a) “Makes the code longer.” — True in file size, but this is a neutral observation, not an advantage in itself.  
  b) “Makes the code easier to understand for computers.” — Incorrect: computers parse syntax and execute logic; comments are ignored by the compiler/interpreter and provide no additional semantic information the machine needs.  
  c) “Increases the time needed to process the program.” — Incorrect: since comments are ignored, they don’t meaningfully increase runtime; build tools strip or skip them.  
  d) “Makes the code easier to understand for humans.” — Correct: comments explain rationale, assumptions, usage, and complex sections, helping other developers (and future you) read, debug, and extend the code.

3) Intermediate “steps” (conceptual)
- Comments are placed near code constructs (functions, loops) describing purpose.  
- During compilation/interpretation the tokenizer either discards or ignores comment tokens.  
- Human readers gain immediate context from comments, reducing cognitive load and time to comprehend.

4) Why the correct answer is correct
Because comments are designed to communicate intent and structure to human readers; they directly improve readability, maintainability, and collaboration—benefits that help teams and future maintainers.

5) Why other options are incorrect
a) is a neutral side-effect, not the advantage asked for; b) and c) misunderstand how comments interact with compilers/interpreters.

6) Conclusion
Therefore the correct choice is d. Makes the code easier to understand for humans. This matches the provided answer.

What is an advantage of including comments or internal documentation in a program's code?单项选择题

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