I accidentally typed %b instead of %d in a printf format string
and got a binary representation of the number. Is that standard C
or a compiler extension?
15  85731 
David Marsh wrote:
I accidentally typed %b instead of %d in a printf format string
and got a binary representation of the number. Is that standard C
or a compiler extension?
%b is not a Standard conversion specifier.
Robert Gamble
David Marsh a écrit :
I accidentally typed %b instead of %d in a printf format string and got
a binary representation of the number. Is that standard C or a compiler
extension?
It is used in the lcc-win32 compiler system for binary representation
Maybe other printfs do that too.
David Marsh <dm****@mail.co mwrites:
I accidentally typed %b instead of %d in a printf format string and
got a binary representation of the number. Is that standard C or a
compiler extension?
It's an extension. It's not likely to be a *compiler* extension,
though; printf is part of the runtime library. This is an important
distinction; gcc, for example, uses whatever runtime library is
available on the system.
--
Keith Thompson (The_Other_Keit h) ks***@mib.org <http://www.ghoti.net/~kst>
San Diego Supercomputer Center <* <http://users.sdsc.edu/~kst>
We must do something. This is something. Therefore, we must do this.
David Marsh wrote:
I accidentally typed %b instead of %d in a printf format string
and got a binary representation of the number. Is that standard C
or a compiler extension?
The standard doesn't define this conversion specifier for printf(), so
it's a local extension.
jacob navia wrote:
David Marsh a écrit :
>I accidentally typed %b instead of %d in a printf format string
and got a binary representation of the number. Is that standard
C or a compiler extension?
It is used in the lcc-win32 compiler system for binary
representation
Unless you have means to disable it, that is another variation from
the standard and a hindrance to creating portable code.
--
<http://www.cs.auckland .ac.nz/~pgut001/pubs/vista_cost.txt>
"A man who is right every time is not likely to do very much."
-- Francis Crick, co-discover of DNA
"There is nothing more amazing than stupidity in action."
-- Thomas Matthews
In article <45************ ***@yahoo.com>,
CBFalconer <cb********@mai neline.netwrote :
....
"There is nothing more amazing than stupidity in action."
-- Thomas Matthews
Indeed. And this is why I wouldn't *dream* of killfiling you.
CBFalconer wrote, On 21/01/07 23:37:
jacob navia wrote:
>David Marsh a écrit :
>>I accidentally typed %b instead of %d in a printf format string
and got a binary representation of the number. Is that standard
C or a compiler extension?
It is used in the lcc-win32 compiler system for binary
representati on
Unless you have means to disable it, that is another variation from
the standard and a hindrance to creating portable code.
Be fair Chuck, it does not break and standard code so it does not get in
the way. Although I would not use it myself even if it was available in
a compiler I use.
--
Flash Gordon
CBFalconer wrote:
jacob navia wrote:
>David Marsh a écrit :
>>I accidentally typed %b instead of %d in a printf format string
and got a binary representation of the number. Is that standard
C or a compiler extension?
It is used in the lcc-win32 compiler system for binary
representati on
Unless you have means to disable it, that is another variation from
the standard and a hindrance to creating portable code.
Standard says it's UB. Printing a binary representation is not much
worse than nasal daemons, is it?
Yevgen
CBFalconer <cb********@yah oo.comwrites:
jacob navia wrote:
David Marsh a écrit :
I accidentally typed %b instead of %d in a printf format string
and got a binary representation of the number. Is that standard
C or a compiler extension?
It is used in the lcc-win32 compiler system for binary
representation
Unless you have means to disable it, that is another variation from
the standard and a hindrance to creating portable code.
C99 7.19.6.1p9:
If a conversion specification is invalid, the behavior is
undefined.
An implementation may define the behavior for things that the standard
says are undefined behavior (many valid extensions are implemented
this way).
It might be nice to be able to turn this extension off and have "%b"
cause a runtime failure (and/or a compile-time warning if the format
is a string literal), to detect programs that depend on it, but the
standard doesn't require it.
--
Keith Thompson (The_Other_Keit h) ks***@mib.org <http://www.ghoti.net/~kst>
San Diego Supercomputer Center <* <http://users.sdsc.edu/~kst>
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