On Fri, May 5, 2017 at 10:26 AM, roger peppe <rogpe...@gmail.com> wrote:
> On 5 May 2017 at 14:11, Michael Jones <michael.jo...@gmail.com> wrote:
>> Just so. One cannot do boolean arithmetic with boolean variables.
>>
>> We have:
>> EQUIVALENCE ("==")
>> XOR ("!=")
>> NOT ("!") -- George Boole's NEGATION
>>
>> We lack:
>> AND ("&") -- George Boole's CONJUNCTION
>> OR ("|") -- George Boole's DISJUNCTION
>>
>> As it happens, one can implement all the operators from the basis of
>> NEGATION and either CONJUNCTION or DISJUNCTION, but as we lack each of the
>> last two, one must be sure to use ints where bools would be natural.
>
> I don't get it. What's the difference between a&&b
> and the hypothetical a&b for two expressions a and b,
> assuming a and b are free of side-effects ?
There is none.
But sometimes b has a side-effect. And sometimes you want that
side-effect to be executed whether or not a is true. Then writing `a
&& b` does not work, and the alternatives are either verbose or
require introducing a new temporary variable name.
Ian
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