hex - I need to understand some hexadecimal notation -

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I have to do some bitwork operation to check conflicts for my game, but, I stumble into some hexadecimal notation By using the binary trick, we can do a simple and y coordinate 

  Y = Y & amp; $ Fffff0

, and this will get us rid of less bits so that the value of 16 will be a valuable one, and keeping it out of collision, and back at 64; Since 

 % 1001000 (68) & amp; $ FEFFF 0 =% 1000000 (64)

Another formula: 

 $ code = $ fffffff0 = 4294967280 = ~ $ F = ~ $ 15 $ ffffffe0 = 4294967264 = ~ $ 1F = ~ 31

What kind of hexadecimal marking is this? What does '$' mean?

~ is the operator for the operation of the operation not . What it does is to turn all the bits into 0 become 1 and 1 is formed.

$ before the value, tells the compiler a hexadecimal number without it, fffffff0 will be treated as a variable name.

So you can see that 15 mean 15 decimal and f hexadecimal, $ 15 Is 15 hexadecimal and 21 decimal.


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