/* An example for variable number of arguments.
   The six places where variable arguments occur are flagged with a "VA"

   Determine the minimum of a number of doubles.

   There are two strategies for handling arguments:
   1) Use an argument count to detect the end of arguments.
      printf() uses a this strategy: the format string tells printf what to
      expect.  vprintf() and friends can handle va_list's.
   2) Use a sentinel to signal the end of arguments, for example,
      a NULL pointer to signal the end of pointer arguments.
*/


#include <stdarg.h> /* VA */ /* defines the required macros */
#include <float.h>

double min_dble(int argcnt, ... /* VA */ ) {
   va_list ap; /* VA */ /* argument pointer */
   double min = DBL_MAX; 

   /* Make ap point to argument after "argcnt" */
   va_start(ap,argcnt); /* VA */


   while(argcnt-- > 0) {
      double next;
      /* pick off next double argument and advance argument pointer */
      next = va_arg(ap, double); /* VA */
      if(next < min) min = next;
   }
   va_end(ap); /* VA */ /* clean up - free alloced space if any */
   return min;
}


int main() {
   printf("Minimum of %lf, %lf, %lf is %lf\n",2.0,-3.0,6.0,
	  min_dble(3, 2.0,-3.0,6.0)); 
   printf("Minimum of %lf, %lf is %lf\n",-8.1,-9.2,
	  min_dble(2, -8.1,-9.2)); 
   return 0;
}