scrolling through http://git.suckless.org/st/plain/st.c I stumbled upon #define ... | Hacker News

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daef on Feb 2, 2017 | parent | context | favorite | on: St – A simple terminal implementation for X

scrolling through http://git.suckless.org/st/plain/st.c I stumbled upon

    #define LEN(a) (sizeof(a) / sizeof(a)[0])

I know precompiler magic is hard, and my C aint the best

but it makes me wonder if the parens at the end make sense - shouldn't it be something like

    #define LEN(a) (sizeof(a) / sizeof((a)[0]))

also asked here https://stackoverflow.com/questions/42001665/is-this-a-plain...

kv-1 on Feb 2, 2017 [–]

i'm not saying that the way they wrote it makes sense, but you have to remember that sizeof is actually an operator and not a function.

daef on Feb 2, 2017 | [–]

just got basically the same answer on stackoverflow - sizeof is an operator -> works w/o parens - makes sense - that's why i'm asking

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