// Ex5_10.cpp
  // Handling a variable number of arguments
  include <iostream>
  include <stdarg.h>
  using std::cout;
  using std::endl;
  
  int sum(int count, ...)
  {
    if(count <= 0)
      return 0;
  
    va_list arg_ptr;                     // Declare argument list pointer
    va_start(arg_ptr, count);            // Set arg_ptr to 1st optional argument
  
    int sum =0;
    for(int i = 0 ; i<count ; i++)
      sum += va_arg(arg_ptr, int);       // Add int value from arg_ptr and increment
   
    va_end(arg_ptr);                     // Reset the pointer to null
    return sum;
  }
  
  int main(int argc, char* argv[])
  {
    cout << sum(6, 2, 4, 6, 8, 10, 12) << endl;
    cout << sum(9, 11, 22, 33, 44, 55, 66, 77, 66, 99) << endl;
  }