What are empty conditions

[FLaTLiN3D]

I've looked around and I cannot seem to figure out what exactly this statement means: "However, an empty condition is not legal for a while loop as it is with a for loop."

I've even tried reading through a while and for statements section in a Java book to see if it would have a better explanation, no dice. Help is appreciated.

At first I thought it was something like "while ();" or "for ();". But neither of those were accepted in my compiler.

Thanks in advance,
FLaTLiN3D

[laserlight]

Basically, this is legal:

unsigned int i;
for (i = 0;; ++i);

But this is not:

while ();

[FLaTLiN3D]

Basically, this is legal:

unsigned int i;
for (i = 0;; ++i);

But this is not:

while ();

How is the first one an empty condition though?

[laserlight]

How is the first one an empty condition though?

Well, how many times will that for loop loop?

[FLaTLiN3D]

Well, how many times will that for loop loop?

Ehh... None? Because "i" can't be 0 and still be increasing by one, correct?
I'm just getting started with C, and I'm not familiar with the double semi-colon that you used, what precisely does that to?

[laserlight]

I'm not familiar with the double semi-colon that you used, what precisely does that to?

Well, suppose I wrote this:

for (i = 0; i < 10; ++i);

Looks more familiar? Now, remove the " i < 10". What do you get?

So, that is the part that is the condition.

[Salem]

The forever loop is typically written as

for ( ; ; ) {
  // always
}