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Re: Bit operations for beginners

by ikegami (Pope)
on Jun 21, 2005 at 21:26 UTC ( #468821=note: print w/ replies, xml ) Need Help??


in reply to Bit operations for beginners

I find it very odd (and incorrect) that bit ops are performed on booleans in the tables.


Comment on Re: Bit operations for beginners
Re^2: Bit operations for beginners
by mrborisguy (Hermit) on Jun 22, 2005 at 00:08 UTC

    Why? A boolean is either true or false. A bit is either 1 or 0. Commonly, boolean's are notated as 1 and 0, in fact, when we did boolean algebra in discreet structures, we always used 1's and 0's. I think it is very accepted and correct that bit ops are performed on booleans.

        -Bryan

      Bits means, by definition, Binary digITS. "true" and "false" are not digits, but "0" and "1" are. Why use a reprentation when you can use an actual value?

      Besides, it's vague. While 0 and 1 can be false and true, false and true can be more than 0 and 1. Why say "I like food" when you mean "I like chocolate"?

      The term "boolean algebra" applies to both logical operators (for which values T and F are typically used) and bitwise operators (for which inputs 0 and 1 are typically used), so what you used in boolean algebra class is moot. Besides, you're not teaching boolean algrebra, you're teaching bitwise operators. What applies to one doesn't necesasrily apply to the other.

      By the way, you might have noticed everyone else used 1s and 0s in their replies.


      There's something else that's inconsistent. In the tables, Bit0 starts with 0/false then goes to 1/true, but Bit1 does the opposite. It makes for highly irregular (non-standard) and confusing tables. Look at the order everyone else used in their replies. They all used the same, standard order. Here it is for convenience:

      Bit0Bit1
      00
      01
      10
      11

      or with three inputs:

      Bit0Bit1Bit2
      000
      001
      010
      011
      100
      101
      110
      111

      etc.

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