including optional parameters in function

I want to include optional parameters in my function but I don't know the correct syntax, can anyone help me out?


thanks

I take it by optional parameters you mean the same effect as printf? You can make use of the macros defined in stdarg.h.

Code:

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>

void va_Error ( const char *fmt, va_list args )
{
  vfprintf ( stderr, fmt, args );
}

void Error ( const char *fmt, ... )
{
  va_list args;

  va_start ( args, fmt );
  va_Error ( fmt, args );
  va_end ( args );

  exit ( EXIT_FAILURE );
}

int main ( void )
{
  Error ( "Fatal error %d : %s\n", 1, "Stupid user" );

  return EXIT_SUCCESS;
}

-Prelude

what mean of "vfprintf " ?

>what mean of "vfprintf " ?
I was expecting this one.

http://www.rt.com/man/vfprintf.3.html

-Prelude

Thanks, that's what I was lookn' for