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Problem with a sentence

 
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REDONDOS
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Joined: 01 Aug 2002
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PostPosted: Thu Aug 01, 2002 2:52 pm    Post subject: Problem with a sentence Reply with quote
Hello, this is my first post and I'm practically a newbie, the question is:

What does this do?

Code:
y = 1+(x<<8);


I don't know what "<<" means... can you help me out?

Thanks.
REDONDOS
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mgm
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PostPosted: Fri Aug 02, 2002 4:01 am    Post subject: Reply with quote
The << is a binary shift operator. Here's Netscape's description of what that means:
Quote:
(Left shift) Shifts its first operand in binary representation the number of bits to the left specified in the second operand, shifting in zeros from the right.


1<<8 is 256, 2<<8 is 512, 0<<8 is zero, and if that makes no sense at all you'll need to learn a bit of binary arithmetic before it will.

I've never had occasion to use binary math in JavaScript, but I'm sure there's a point to it sometimes.
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REDONDOS
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PostPosted: Fri Aug 02, 2002 2:11 pm    Post subject: Reply with quote
Thanks a lot, man, understood it perfectly.

Where can I read more about binary arithmetic?
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