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Take A QuizGeneral Tech Bugs & Fixes 2 years ago
Posted on 16 Aug 2022, this text provides information on Bugs & Fixes related to General Tech. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.
This is the comma operator at work. It evaluates the left hand side of the operator (scanf("%d", &num)
), then the right hand side (arr.push_back(num)
) and returns the result of this expression.
I don't think the code snippet is a good usage scenario for the comma operator. It seems to be employed for not typing {}
to create a body for the while
loop, which is lazy and unnecessarily "smart". But it works.
If you're interested in legitimate use cases for the comma operator, have a look at this article.
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manpreet
Best Answer
2 years ago
This question already has an answer here:
I came across this block of code when studying for my class. It was in my professor's presentation and I thought it was an error, so out of pure curiosity, I tried to compile it. To my surprise, it's actually a valid code. I tried looking it up online but couldn't find a clear answer as to why exactly does it work.
I expected the while-loop to cause a compilation error, but it runs smoothly. Is it standard or was that introduced recently?