1  #include <stdarg.h>
       2  
       3  void fdouble (double one, ...)
       4  {
       5    double value;
       6    va_list ap;
       7  
       8    va_start (ap, one);
       9    value = va_arg (ap, double);
      10    va_end (ap);
      11  
      12    if (one != 1.0 || value != 2.0)
      13      abort ();
      14  }
      15  
      16  int main ()
      17  {
      18    fdouble (1.0, 2.0);
      19    exit (0);
      20  }