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

double sum(int count, ...)
{
    va_list valist;
    double sum = 0.0;
    int i;

    va_start(valist, count);

    for (i = 0; i < count; ++i)
    {
	sum += va_arg(valist, double);
    }

    va_end(valist);

    return sum;
}

int main()
{
    printf("%lf\n", sum(3, 2.2,3.3,4.0));
    return 0;
}