class NativeSumDemo
{
    native public static double sum( double [] arr );
    
    static
    {
        System.loadLibrary( "Sum" );
    }
        
    public static void main( String[] args )
    {
        double [] arr = { 3.0, 6.5, 7.5, 9.5 };
        
        System.out.println( sum( arr ) );
    }
}