From: arne@vajhoej.dk
On 8/18/2025 3:42 PM, Arne Vajhøj wrote:
> On 8/18/2025 8:37 AM, Simon Clubley wrote:
>> On 2025-08-15, Arne Vajhøj wrote:
>>> In general I like the idea of writing code in a way that does
>>> not require the reader to have memorized ten thousand things from
>>> the language spec.
>>>
>>> But I do not consider this a matter of remembering the specific
>>> details about an operator - I consider this a matter of remembering
>>> what operator a symbol represent.
>>>
>>> I consider "short circuiting AND" and "non short circuiting AND"
>>> to be two different operators.
>>
>> They are not. One is a subset of the other and both carry out the
>> same core operation.
>>
>>> And in C then && is the first operator not the second operator.
>>>
>>> And understanding what operator each symbol represent is not
>>> detail but core. IMHO.
>>>
>>
>> I disagree. Strongly. Both operators do exactly the same thing which
>> is to implement a logical AND. Code written using this operator
>> generates exactly the same logical AND result regardless of whether
>> short circuiting is in use or not.
>>
>> In addition however, a short circuiting compiler generates code to
>> stop evaluation if the previous logical AND subexpression was false.
>> This is a feature of the compiler and does not turn logical AND into
>> something which does something other than logical AND.
>
> Considering two operators the same because the functionality of one is
> a subset of the functionality of the other seems unlogical to me.
And some languages have both operators.
C is a bit messy. Pun intended.
But John already mentioned VMS Pascal:
https://docs.vmssoftware.com/vsi-pascal-for-openvms-reference-ma
ual/#LOGICAL_OP_SEC
and I mentioned VB.NET:
https://learn.microsoft.com/en-us/dotnet/visual-basic/language-r
ference/operators/logical-bitwise-operators
Arne
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