in program below
#include <stdio.h>
int main()
{
int id = 123, io = 0123, ih = 0x123;
long ld = 1234567L, lo = 01234567l, lh = 0X1234567L;
float f = 123.456f;
double d = 01234.56789L;
printf("id = %d\t%o\t%x\nio = %d\t%o\t%x\nih = %d\t%O\t%X\n",
id, id, id, io, io, io, ih, ih, ih);
printf("ld = %ld\t%lo\t%lx\n lo = %ld\t%lo\t%lx\n lh = %ld\t%lo\t%l\n" ,
ld, ld, ld, lo, lo, lo, lh, lh, lh);
printf("f = %lf\t%le\t%lg\n d = %lf\t%lE\t%lG\n ", f, f, f, d, d, d);
return 0;
}
the output got is:
id = 123 173 7b
io = 83 123 53
ih = 291 %O 123
ld = 1234567 4553207 12d687
lo = 342391 1234567 53977
lh = 19088743 110642547 1234567
f = 123.456001 1.234560e+02 123.456
d = 1234.567890 1.234568E+03 1234.57
why is there a %O in line 3 instead of octal o/p expected?
and in line for d the last o/p is 1234.57. but %g is either %lf or %le
right? so if it is %lf then why is it 1234.57 instead of 1234.56789?
thanks
Mar 13 '08
12  3562  ri*****@cogsci. ed.ac.uk (Richard Tobin) writes:
In article <EO************ *************** ***@bt.com>,
Richard Heathfield <rj*@see.sig.in validwrote:
>>>1999-2008: Almost the entire universe ignores C99 completely.
>>This reflects your personal opinion more accurately than it describes
the truth.
>>Well, actually it reflects my personal understanding of the truth. The only
validated C99 compilers I know about are:
The absence of validated C99 compilers doesn't mean that the universe
is completely ignoring C99. For example, I can use inline functions
or VLAs with fair confidence that they will be available, and
sufficiently compatible, on all the systems I care about. I don't
think this would be true without the existence of C99.
I think it would be true regardless. They existed relatively widely
before C99, AFAICT (with "inline"'s semantics usually being based on
C++'s rules).
--
Just my 2¢, of course
Micah J. Cowan
Programmer, musician, typesetting enthusiast, gamer... http://micah.cowan.name/
Richard Heathfield wrote:
Richard Tobin said:
<snip>
>The absence of validated C99 compilers doesn't mean that the
universe is completely ignoring C99. For example, I can use
inline functions or VLAs with fair confidence that they will
be available, and sufficiently compatible, on all the systems
I care about. I don't think this would be true without the
existence of C99.
Understood, but the difficulty is in identifying which features
of C99 can be used "portably". We sure could use a central
reference, listing C99 features down the left, compilers across
the top, and ticks in the boxes where the feature has been
implemented according to C99 semantics. That way, maybe people
could start to use C99 features with some degree of confidence
that they will be portable to "all the systems I care about",
for various values of "I".
There are two primary areas in which standards are useful. One is
in specifying what is needed to process some source code. Another
is in specifying what features source code can use.
For the first, there is no loss if the source is prepared without
using all features of the standard. The result remains perfectly
portable.
For the second, things are more complicated. If the writer wants
to maximize portability he can write to the C90 standard, as you
do. This requires checking features used against that standard,
and things can slip through. More often the writer uses the C99
standard for checking, and then eliminates things he knows are not
available in C90. Errors can abound.
--
[mail]: Chuck F (cbfalconer at maineline dot net)
[page]: <http://cbfalconer.home .att.net>
Try the download section.
--
Posted via a free Usenet account from http://www.teranews.com
naunetr <wi************ @roadtonowhere. invalidwrote:
>
sorry got it confused with scanf! but why is there a %F too? shouldn't %f
be enough?
%F was new in C99. It differs from %f in the treatment of exceptional
values: %F produces INF, INFINITY, or NAN whereas %f produces inf,
infinity, or nan.
-Larry Jones
In a minute, you and I are going to settle this out of doors. -- Calvin This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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