I have to maintain a code, and came up with this:
for (;;) {
//code
}
What would it do? I couldn't find documentation about it.
In a hunch I think it runs only once... but that would be useless...
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1It endlessly does nothing - unless you put something inside the `{}` that is – David Wilkins Apr 04 '14 at 18:18
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2It's the same as a `while(true)` – Ayush Apr 04 '14 at 18:18
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2@DavidWilkins Well; the endlessly part is correct of course, but I assume the `//code` part is 'something' being done. Endlessly. ;) – Andrew Barber Apr 04 '14 at 18:19
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@Jorge Then there is some code within the loop that escapes. – Andrew Barber Apr 04 '14 at 18:19
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@Jorge then there is obviously something inside the `{}` – David Wilkins Apr 04 '14 at 18:19
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1For example, this would not loop endlessly: `for(;;) { break; }` – Ayush Apr 04 '14 at 18:20
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1@AndrewBarber maybe, but `//code` is a comment and does nothing – David Wilkins Apr 04 '14 at 18:21
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@DavidWilkins hah! Correct! :) – Andrew Barber Apr 04 '14 at 18:21
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1Different language but same question http://stackoverflow.com/questions/7081339/what-does-for-mean-in-java?rq=1 – j08691 Apr 04 '14 at 18:21
4 Answers
3
it is an infinite loop, similar in function as:
while(true)
{
}
T McKeown
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4The most scary part is that I think I am responsible for this... lol. Might be something of my newbie things – JorgeeFG Apr 04 '14 at 18:21
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1hah! Doesn't it suck when you look at code you wrote in the past, and are all like... WTF is this supposed to do? Or... uhhh... so I hear... ;) – Andrew Barber Apr 04 '14 at 18:22
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1Oh I think I know why I did it... because I am checking for errors inside, and when some error is found, I have to exit and do not check the other errors... but there should be a better less scary way – JorgeeFG Apr 04 '14 at 18:25
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Your code sample is an infinite loop. To terminate, the omitted code (//code) must exit the loop or the entire PHP script.
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It's a for loop without initialization parameters, no breaking conditions and no increments/decrements/whatever on each iteration - think of it like for (nothing; nothing; nothing).
Unless you break it from the inside, it's going to run forever.
Shomz
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For embedded code it is the main loop that does all the other sub process in a super loop scheme.
SamFisher83
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