how to use write() to put double

[Guest]

in <AUP>


#include <unistd.h>
define BUFFSIZE 8192

char buf [BUFFSIZE];
write( STDOUT_FILENO, BUF, BUFFSIZE);

////////////////////////////////////////////

if i want to put double ,what shall i do?


double aa =11.0;
write(STDOUT_FILENO, (void *)&aa , sizeof(double));

it put &@ .......
thanks

 

[Artie Gold]

in <AUP>


#include <unistd.h>
define BUFFSIZE 8192

char buf [BUFFSIZE];
write( STDOUT_FILENO, BUF, BUFFSIZE);

////////////////////////////////////////////

if i want to put double ,what shall i do?


double aa =11.0;
write(STDOUT_FILENO, (void *)&aa , sizeof(double));

it put &@ .......
thanks

There is no such function as `write()' in standard C, hence your
question is off topic. Please post to a newsgroup that deals with your
particular platform. And PLEASE, RTFM!!!

--ag

[All right. A hint (and think about this): What you expect it to look
like, and why?]

 

[Jens.Toerring]

in <AUP>

#include <unistd.h>

This is a non-standard header file, which probably means you're
on some UNIX-like system.

define BUFFSIZE 8192

char buf [BUFFSIZE];
write( STDOUT_FILENO, BUF, BUFFSIZE);

write() is not a standard C function but an extension of your
platform, so you should ask about this in a group discussing
programming on the system you use. If it is some kind of UNIX
comp.unix.programmer would seem to be appropriate.

if i want to put double ,what shall i do?

double aa =11.0;
write(STDOUT_FILENO, (void *)&aa , sizeof(double));

it put &@ .......

If you want the number written out in a form like "11.000000" use
fprintf(). Functions like fwrite() (which probably is the thing
most nearly related to write()) output the binary representation
of the double, not the result of a conversion to a string.

Regards, Jens