How to Count Variable Numbers of Arguments in C?

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

// this function returns minimum of integer numbers passed.  First 
// argument is count of numbers.
int min(int arg_count, ...)
{
  int i;
  int min, a;
  
  // va_list is a type to hold information about variable arguments
  va_list ap; 

  // va_start must be called before accessing variable argument list
  va_start(ap, arg_count); 
   
  // Now arguments can be accessed one by one using va_arg macro
  // Initialize min as first argument in list   
  min = va_arg(ap, int);
   
  // traverse rest of the arguments to find out minimum
  for(i = 2; i <= arg_count; i++) {
    if((a = va_arg(ap, int)) < min)
      min = a;
  }   

  //va_end should be executed before the function returns whenever
  // va_start has been previously used in that function 
  va_end(ap);   

  return min;
}

int main()
{
   int count = 5;
   
   // Find minimum of 5 numbers: (12, 67, 6, 7, 100)
   printf("Minimum value is %d", min(count, 12, 67, 6, 7, 100));
   getchar();
   return 0;
}