The page I am working on has a javascript function executed to print parts of the page. For some reason, printing in Safari, causes the window to somehow update. I say somehow, because it does not really refresh as in reload the page, but rather it starts the "rendering" of the page from start, i.e. scroll to top, flash animations start from 0, and so forth. The effect is reproduced by this fiddle: http://jsfiddle.net/fYmnB/ Clicking the print button and finishing or cancelling a print in Safari causes the screen to "go white" for a sec, which in my real website manifests itself as something "like" a reload. While running print button with, let's say, Firefox, just opens and closes the print dialogue without affecting the fiddle page in any way. Is there something with my way of calling the browsers print method that causes this, or how can it be explained - and preferably, avoided? P.S.: On my real site the same occurs with Chrome. In the ex
What you are doing is combining type casts with unary operators.
ReplyDeleteSo let's see:
First, you have the value -1, which you cast to the type long.
Then, you perform the unary operation +, which doesn't change the value, so you still have (long) -1.
Then, you cast it to int, so we now have int -1. Then, you use unary operator -, so we have -(-1), which is 1.
Then you cast it to char, so we have char 1. Then, you use unary operator +, so you still have 1.
Finally, the value is cast to byte, so you have byte 1. And then it is once again (implicitly) cast to int.
The various (<type>) parts are just casting between various types. So what happens is, reading from the right, 1 -> -1 -> (long)-1 -> (int)-1 -> -(int)-1 = 1 -> (char)1) -> (byte)1 which then gets cast to an int during the assignment. At no point does the type cast result in effective change of the value, so the entire first line is equivalent to int i = 1;.
ReplyDeleteThis goes right to left. -1 gets cast to long. Then the + prefix is applied (which has no effect), and it's cast to int. Then the - gets applied (changing it to 1) and it gets cast to char. Lastly, the + prefix is applied (which still has no effect) and it's cast to byte.
ReplyDeletelets add parenthesis:
ReplyDeleteint i = ((byte) + ((char) - ((int) + ((long) (- 1)))));
System.out.println(i);
basically this is just a series of casts and unary operators (+ does nothing, - negates)
the full program flow is in luiscubal's answer