In a c/c++ file I discovered a strange for loop
for (;;) {...}
I don't know if this runs once, infinetly or works in some other way Source: https://git.kernel.org/cgit/linux/kernel/git/jejb/efitools.git/tree/PreLoader.c Line 87
Asked
Active
Viewed 147 times
-3
-
3The same as a `while(true)`-loop. – EOF Oct 01 '16 at 13:10
-
1`for(;;)` is equivqlent to `while(1)`. Its an infinite loop. – haccks Oct 01 '16 at 13:11
-
thanks. I was not sure and found nothing on the web – Paul Götzinger Oct 01 '16 at 13:11
-
2You could have tried it yourself. – alain Oct 01 '16 at 13:12
-
I created a sample code snippet, but it failed to compile – Paul Götzinger Oct 01 '16 at 13:13
-
1The forever alone loop. – Oct 01 '16 at 13:17
4 Answers
1
The for(;;) loop will continue forever until some command inside the loop causes it to terminate.
Some examples of such commands would be "break", or "return"
Nick Delben
- 95
- 3
- 14
1
In the Linux kernel, infinite loops are written like this, instead of the usual while(true) or while(1) in other projects. This is a matter of style.
Paul Stelian
- 1,381
- 9
- 27
1
That is an infinite loop. It's an ordinary for loop with no condition expression. It is equivalent to while(1). It is a bit odd to the eyes of nearly all C and C++ programmers, and should be avoided. I think people from a C/C++ background are more likely to prefer while(1) rather than for(;;).
K&R 2nd ed 3.5:
is an ``infinite'' loop, presumably to be broken by other means, such as a break or return. Whether to use while or for is largely a matter of personal preference.
msc
- 33,420
- 29
- 119
- 214
0
It's an infinite loop, equivalent to while(true). When no termination condition is provided, the condition defaults to true.