What will happen if we put a semi-colon after a for loop in C++?

Comments

• plistig@feddit.de ⁨1⁩ ⁨year⁩ ago

  A semicolon ends a statement, and semicolon is a statement on its own. One that does nothing. That’s why you can write int i; for (i = 0; i < 3; i++); to set i = 3. You can use that pattern to find something in an iterator, etc. But I would prefer int i = 0; while (i < 3) { i++; } for readability.

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  • octoperson@sh.itjust.works ⁨1⁩ ⁨year⁩ ago

    Your less thans got HTML-escaped into < and I spent embarrassingly long trying to figure out what pointer magic you were trying to demonstrate

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    • plistig@feddit.de ⁨1⁩ ⁨year⁩ ago

      Yeah, both Voyager and the normal lemmy web client escape the less-than sign. I tried it twice on both clients.

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• JakenVeina@lemm.ee ⁨1⁩ ⁨year⁩ ago

  The loop will run to completion with no side effects. Unless it gets optimized away by the compiler or CPU.

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  • vext01@lemmy.sdf.org ⁨1⁩ ⁨year⁩ ago

    Now slap some commas in there and you can have side effects in the loop header.

    Guaranteed to confuse :)

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  • Miaou@jlai.lu ⁨1⁩ ⁨year⁩ ago

    It’s actually ub, so it could also find the cure to cancer

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• otter@lemmy.ca ⁨1⁩ ⁨year⁩ ago

  Might help if you add some sample code

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• pelya@lemmy.world ⁨1⁩ ⁨year⁩ ago

  Pro tip: for(;;) takes less to type thann while(true)

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  • deegeese@sopuli.xyz ⁨1⁩ ⁨year⁩ ago

    My programs cause enough tears on their own without having to put them in the code itself.

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  • Joey@programming.dev ⁨1⁩ ⁨year⁩ ago

    #define EVER (;;)

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• GammaGames@beehaw.org ⁨1⁩ ⁨year⁩ ago

  Nothing

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