public static void main(String[] args) {
        System.out.println("100.00D + 25.00D = " + addDouble(100.00D, 25.00));
        System.out.println("100.00D + 26.00D = " + addDouble(100.00D, 26.00));
        System.out.println("100.00D + 27.00D = " + addDouble(100.00D, 27.00));
        System.out.println("100.00D + 28.00D = " + addDouble(100.00D, 28.00));
        System.out.println("100.00D + 29.00D = " + addDouble(100.00D, 29.00));
    }
    
    private static double addDouble(double x, double y) {
        return x + y;
    }