#include <cstdio>
#include <cstdarg>
#include <iostream>
using namespace std;

void sum(char *msg, ...) // Summe einer Zahlenliste mit 0 am Ende
{
  int wert, summe = 0;
  va_list ap;
  va_start(ap, msg);
  while( (wert = va_arg(ap,int)) != 0 ) 
  {
    summe += wert;
  }
  cout << msg << summe << '\n';
  va_end(ap);
}

int main() 
{
  sum("Summe von 1+2+3+4 = ", 1,2,3,4,0 );
}