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int vfprintf(FILE *stream, const char *format, va_list arg);

Equivalent to fprintf with variable argument list replaced by arg, which must have been initialised by the va_start macro (and may have been used in calls to va_arg).

C Sourcecode Example

 * vfprintf example code
#include <stdio.h> /* including standard library */
//#include <windows.h> /* uncomment this for Windows */
#include <stdarg.h>
int myfprintf( FILE *file, char const * format, ... )
  va_list args;
  int n;
  va_start( args, format );
  n=vfprintf( file, format, args );
  va_end( args );
  fputs("vfprintf test line\n", file);
  return n;
int main (void)
  char string[] ="Hello";
  FILE * stream = fopen("test.txt","w");
  if(stream == 0) {
   perror("file problem");
   myfprintf( stream, " %s World\n", string);
   return 0;


Hello World
vfprintf test line

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c/stdio.h/vfprintf.txt · Last modified: 2024/02/16 01:05 (external edit)

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