C++ In a Nutshell

Name

vfprintf function — Writes formatted data

Synopsis

#include <cstdarg>
int vfprintf(FILE* stream, const char* format, va_list arg)

The vfprintf function is like fprintf, but the values to print are taken from successive arguments in arg (obtained by calling va_start(arg, param )). Use vfprintf to write your own fprintf-like function.

Example

The following shows how you can implement fprintf in terms of vfprintf:

int fprintf(std::FILE* stream, const char* format,  . . . )
{
  std::va_list ap;
  va_start(ap, format);
  int result = vfprintf(stream, format, ap);
  va_end(ap);
  return result;
}

See Also

fprintf function, vfwprintf in <cwchar> , <cstdarg>