[fpc-devel] Incomplete docs on operator precedence / Question about actual precedence

[Sven Barth]

Am 03.02.2014 12:04, schrieb Michael Van Canneyt:
>
>
> On Mon, 3 Feb 2014, Sven Barth wrote:
>
>> Am 03.02.2014 08:58, schrieb Michael Van Canneyt:
>>> As for unary minus: this is the same as a binary minus in arithmatic 
>>> expressions.
>>
>> Not quite. Take this example:
>> === output end ===
>>
>> So unary minus (and also unary plus which is a valid operator as 
>> well!) binds stronger than multiplication.
>
> Then that is an anomaly introduced by operator overloading.
>
> In math, -2^2 = -4
Yes and the same is true in FPC with operator overloading. If you add a 
** operator overload (which uses Trunc(Power(aLeft.i, aRight.i)) ) and 
have this expression: -t1 ** t2 with t1.i = 2 and t2.i = 2 the result 
will be -4 as well.

Please keep in mind that -2^2 is (-2) * (-2).

Regards,
Sven