What is the difference between for(;;) and while(1)? [duplicate]

This question already has answers 开发者_如何学Pythonhere: Closed 12 years ago.

Possible Duplicate:

Is “for(;;)” faster than “while (TRUE)”? If not, why do people use it?

I was wondering what is the difference between for(;;) and while(1) when both perform same function? Will there be any difference of speed of compilation

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The difference with these is that many compilers will warn about while(true) ("constant expression used as loop expression"), while none I know of warn about for(;;).

They should generate the same code, though.

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no functional difference at all, just a matter of taste.

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With for, you can do this:

#define ever (; ;) // note the two happy faces? ;)

for ever { ... }   // endless loop

Which is not possible with while.

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• Both will cause infinite loop unless break is called explicitly.
• Personally I prefer while(1), it's more readable

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No difference. I prefer the latter.

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6 of one, 110 of the other.

The latter appears more concise.

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No difference, unless you want to make use some kind counter later as below.

for (int i =0; i < 100; i++) {
   // some code
} 

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Both are the same in C++. However, your post is tagged with c# and c++.

If you're using C#, you'll need to use while (true) {...}. Personally, I prefer the same in C++: numbers are used only when dealing with... well, numbers! When dealing with boolean values, true and false are used instead.

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They both defines the exact same functional behavior and produce exactly the same IL code from C#.

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I'm old-school, I still do the following:

#define TRUE 1  
#define FALSE 0  
while (TRUE) { /*--do something, mutley--* }