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disturbing problem with PRINTF() !!
Post 16972 by brain_processin on Saturday 9th of March 2002 12:04:15 PM
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
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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LEARN ABOUT DEBIAN
explain_printf_or_die
explain_printf_or_die(3) Library Functions Manual explain_printf_or_die(3) NAME
explain_printf_or_die - formatted output conversion and report errors SYNOPSIS
#include <libexplain/printf.h> int explain_printf_or_die(const char *format); int explain_printf_on_error(const char *format); DESCRIPTION
The explain_printf_or_die function is used to call the printf(3) system call. On failure an explanation will be printed to stderr, obtained from the explain_printf(3) function, and then the process terminates by calling exit(EXIT_FAILURE). The explain_printf_on_error function is used to call the printf(3) system call. On failure an explanation will be printed to stderr, obtained from the explain_printf(3) function, but still returns to the caller. format The format, exactly as to be passed to the printf(3) system call. RETURN VALUE
The explain_printf_or_die function only returns on success, see printf(3) for more information. On failure, prints an explanation and exits, it does not return. The explain_printf_on_error function always returns the value return by the wrapped printf(3) system call. EXAMPLE
The explain_printf_or_die function is intended to be used in a fashion similar to the following example: int result = explain_printf_or_die(format); SEE ALSO
printf(3) formatted output conversion explain_printf(3) explain printf(3) errors exit(2) terminate the calling process COPYRIGHT
libexplain version 0.52 Copyright (C) 2010 Peter Miller explain_printf_or_die(3)