When I first saw this example , I don't get it price+_ How can it be equal to 113.0625 了 . I read it several times later , About got it . in short , The above example can be understood as ：
_ = (tax = 12.5 / 100)
_ = (price = 100.50)
_ = (price * tax)
_ = (price + _)
It's easy to understand , The result of each numerical calculation is finally output as the expression result , Are assigned to by default ‘_’, So the end result is ：
_ = 100.50+12.5625 = 113.0625
