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# ~30

Otto Deckelman
Ranch Hand
Posts: 30
I believe the symbol is called a tilda, but correct me if I'm wrong. What does this mean and represent in computer math? Art M. replied to my question yesterday about bitwise shift operators and used this in his explanation.

Nathan Pruett
Bartender
Posts: 4121
Otto -
Yes, this symbol is called a tilde, and it is the bitwise inversion operator. Basically what it does is switch all the bit values of an integer value from 0 to 1 and from 1 to 0...
so :

So the bitwise inversion of 15 = -16 and the bitwise inversion of 30 = -31...
Does this make sense?
HTH,
-Nate
[This message has been edited by Nathan Pruett (edited April 06, 2001).]

Otto Deckelman
Ranch Hand
Posts: 30
thanks, it helps alot.