-Wall incorrectly complains about scanf with %a

[Eljay Love-Jensen]

Hi everyone,

I defer to Segher's comments on C99, and retract my statements regarding 
"%as" versus "%a".

Seems that GNU libc's extension is (now) stomping on C99, and that "%a" 
(and "%A") is a valid format specifier alias for "%e".

Note that "%a" is NOT in C++98!  (But may sneak in their through 
code-mingling.  I'm not sure what C++03 says about it, if anything.)

Relevant references:
C99 sections 6.4.4.2, 6.4.8
C++98 sections 2.9, 2.13.3

Learn something new everyday!  Love this forum!

--Eljay