Ankit Jain wrote:
> can anybody tell me when we write like this while
> writing asm construct then what does underscore mean?
>
> __asm__("construct")
Underscores are treated just like letters in macro and symbol names.
By convention, the implementation (compiler, core libraries) puts
underscores at the beginning of any "private" names, so that they
don't conflict with any names which you might use in your code (you
wouldn't normally choose names beginning with underscores in your own
code).
According to the ANSI C99 specification:
7.1.3 Reserved identifiers
[#1] Each header declares or defines all identifiers listed
in its associated subclause, and optionally declares or
defines identifiers listed in its associated future library
directions subclause and identifiers which are always
reserved either for any use or for use as file scope
identifiers.
-- All identifiers that begin with an underscore and
either an uppercase letter or another underscore are
always reserved for any use.
-- All identifiers that begin with an underscore are
always reserved for use as identifiers with file scope
in both the ordinary and tag name spaces.
--
Glynn Clements <[EMAIL PROTECTED]>
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