03-09-2002
disturbing problem with PRINTF() !!
hello everybody,
here is my problem:
________________________________________
#include <stdio.h>
int main()
{
int i=10;
printf("value is %i",i);
return 0;
}
_________________________________________
when i compile and execute, nothing appears on screen!!
but if i replace the printf line with this one:
printf("value is %i\n",i); // i just added a \n
then i can see the line displayed on my screen.
ok, that's allright, but what if i want to display something _without_ the \n ?
someone told me it was a classic buffer problem and adviced me to use fflush()
but when i write:
printf("value is %i",i); fflush(stdout);
nothing happens. i also tried to put fflush(stdout) before the printf, because i don't know how to use this function correcly, but nothing happened.
can someone explain me what's the matter?!!
im using Linux Mandrake 8.0
thanks
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PRINTF(1) User Commands PRINTF(1)
NAME
printf - format and print data
SYNOPSIS
printf FORMAT [ARGUMENT]...
printf OPTION
DESCRIPTION
Print ARGUMENT(s) according to FORMAT, or execute according to OPTION:
--help display this help and exit
--version
output version information and exit
FORMAT controls the output as in C printf. Interpreted sequences are:
" double quote
\ backslash
a alert (BEL)
backspace
c produce no further output
e escape
f form feed
new line
carriage return
horizontal tab
v vertical tab
NNN byte with octal value NNN (1 to 3 digits)
xHH byte with hexadecimal value HH (1 to 2 digits)
uHHHH Unicode (ISO/IEC 10646) character with hex value HHHH (4 digits)
UHHHHHHHH
Unicode character with hex value HHHHHHHH (8 digits)
%% a single %
%b ARGUMENT as a string with '' escapes interpreted, except that octal escapes are of the form or NNN
%q ARGUMENT is printed in a format that can be reused as shell input, escaping non-printable characters with the proposed POSIX $''
syntax.
and all C format specifications ending with one of diouxXfeEgGcs, with ARGUMENTs converted to proper type first. Variable widths are han-
dled.
NOTE: your shell may have its own version of printf, which usually supersedes the version described here. Please refer to your shell's
documentation for details about the options it supports.
AUTHOR
Written by David MacKenzie.
REPORTING BUGS
GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
Report printf translation bugs to <http://translationproject.org/team/>
COPYRIGHT
Copyright (C) 2017 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.
SEE ALSO
printf(3)
Full documentation at: <http://www.gnu.org/software/coreutils/printf>
or available locally via: info '(coreutils) printf invocation'
GNU coreutils 8.28 January 2018 PRINTF(1)