"Richard Lewis Haggard" <HaggardAtWorldDotStdDotCom> wrote in message
news:O6$q%23z4JGHA.1532@TK2MSFTNGP12.phx.gbl...
> I'm porting some VB to C# and have run into a conditional that seems odd.
> Would one of you who understands VB conditionals better than I please
> confirm if the logic is correct? I can't figure out where the final AND
> binds to in the conditional.
>
> Here's the problem conditional:
> If Not IsNumeric(str1) Or (Len(str1)>16 Or (Len(str1)<14 And Len(str1)<>5)
> And str2="L") Then
>    ' stuff
> End If
>
> The above, simplified, boils down to
>
> if A Or (B Or (C And D) And E) then....
>
> Given the above logic, which of these conditions resolve to true or false?
> if 1 or (0 or (0 and 0) and 0) then true or false?
> if 0 or (1 or (0 and 0) and 0) then true or false?
> if 0 or (0 or (1 and 0) and 0) then true or false?
> if 0 or (0 or (0 and 0) and 1) then true or false?
>
> if 1 or (0 or (0 and 0) and 1) then true or false?
> if 0 or (1 or (0 and 0) and 1) then true or false?
> if 0 or (0 or (1 and 0) and 1) then true or false?
> --
> Richard Lewis Haggard
> www.Haggard-And-Associates.com
>

> "Richard Lewis Haggard" <HaggardAtWorldDotStdDotCom> wrote ...
>> I'm porting some VB to C# and have run into a conditional that seems
>> odd. Would one of you who understands VB conditionals better than I
>> please confirm if the logic is correct? I can't figure out where the
>> final AND binds to in the conditional.
>>
>> Here's the problem conditional:
>> If Not IsNumeric(str1) Or (Len(str1)>16 Or (Len(str1)<14 And
>> Len(str1)<>5) And str2="L") Then
>>    ' stuff
>> End If
>>
>> The above, simplified, boils down to
>>
>> if A Or (B Or (C And D) And E) then....
>>
>> Given the above logic, which of these conditions resolve to true or
>> false? if 1 or (0 or (0 and 0) and 0) then true or false?
>> if 0 or (1 or (0 and 0) and 0) then true or false?
>> if 0 or (0 or (1 and 0) and 0) then true or false?
>> if 0 or (0 or (0 and 0) and 1) then true or false?
>>
>> if 1 or (0 or (0 and 0) and 1) then true or false?
>> if 0 or (1 or (0 and 0) and 1) then true or false?
>> if 0 or (0 or (1 and 0) and 1) then true or false?
>
> I don't think there can be any difference in the rules of precedence
> in both languages.

> So precedence is (only those operators, used in
> given expressions): parentheses, NOT, AND, OR. Same level of
> precedence evaluated from left to right.
>
> To simplify task, I've replaced 0s/1s with False/True and run them in
> VB
>
> Debug.Print True Or (False Or (False And False) And False)
> Debug.Print False Or (True Or (False And False) And False)
> Debug.Print False Or (False Or (True And False) And False)
> Debug.Print False Or (False Or (False And False) And True)
> Debug.Print True Or (False Or (False And False) And True)
> Debug.Print False Or (True Or (False And False) And True)
> Debug.Print False Or (False Or (True And False) And True)
>
> Results (in the same order):
>
> True
> True
> False
> False
> True
> True
> False