Register Variables

How exactly do register variables work in C? When should they be used? K&R touches upon them briefly but moves right along. Is there any source in which I can read about them in depth?

>>36

It is illegal. Flexible arrays are illegal in C89. They're written as "[]" in C99. It does not matter whether it's supported as an extension or not. It's not pure C: it's a C dialect.

Also, it's clear from the context that I was talking about situations different from flexible arrays.

Just read the standard and fuck off.

>>37

Do what?

If the compiler goes against the standard, then it's non-conformant.
If it extends an area where the standard yields unspecified or undefined behavior, it's conformant. Programs which use the feature are conformant, but not strict-conformant.

For example, if the compiler does not yield a diagnostic message when required to, it's non-conformant. Whether it's relevant or not to the code, it does not matter: the standard does not guarantee any further behavior.

Simple as this.

>>39

I guess it would be used in situations where a type whose size is zero is useful (sizeof(void) == 0), for example, when creating some metaprogramming macros.

>>41
fuck off, Zhivago

>>23
tripcode
Well that explains everything.

>>31
So if the object has file duration
Illiterate jewish mental midget, the C standard doesn't deal with files. Again, read one of the C standards you fucking idiot.