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I tend to leave old code around as comments until I am sure that my current version is stable. Just the way I like working. I am concerned that I may be unnecessarily bloating up my sketches.

Do comments occupy space in an Arduino IDE compiled C++ sketch for Arduino (Nano, Uno)? Is it correct to suppose that the behavior would be the same for NodeMCU?

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    you can determine that by compiling two identical sketches, one of which has a huge amount of comments
    – jsotola
    Sep 11, 2019 at 19:54
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    Not related to your question but... you should learn to use version control, and use comments for... commenting the code!
    – Edgar Bonet
    Sep 11, 2019 at 20:26
  • Unrelated, unhelpful, unasked for and... mistaken. One is often wrong when guessing with little or no information to base one's assumptions upon. I am talking about in between versions, as is clearly stated in the question.
    – tony gil
    Sep 12, 2019 at 0:02
  • What's unhelpful, unasked for and mistaken? Edgar's comment about source control is a very good suggestion. (Keeping your old code in the file as comments is superfluous if you use version control.)
    – Duncan C
    Sep 12, 2019 at 0:50

2 Answers 2

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The C/C++ processor (which processes only the #define & #include statements) is the first stage of the compilation process. It runs before the compiler does and strips out everything that isn't code. The compiler will never see your comments.

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No. Comments don’t take up any space.

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