Operands priority

Psychophanta · Post by **Psychophanta** » Wed Jan 19, 2005 8:23 pm

a.l=$aabbcc
e.l=$ffeedd
Debug Hex($FFFF&e|a)
Debug Hex(e|a&$FFFF)

Why I get different values?
Shouldn't be the same?
Bug?

Pupil · Post by **Pupil** » Wed Jan 19, 2005 8:35 pm

It seems the binary operators '&' and '|' have the same priority so i assume they just evaluate from left to right, the shift operators('<<' and '>>') however seems to have higher priority than the previously mentioned operators and are thus evaluated first..

Psychophanta · Post by **Psychophanta** » Wed Jan 19, 2005 10:58 pm

Pupil wrote:It seems the binary operators '&' and '|' have the same priority so i assume they just evaluate from left to right, the shift operators('<<' and '>>') however seems to have higher priority than the previously mentioned operators and are thus evaluated first..

But operators should NEVER be evaluated by position in expressions, but by type.
That's an ultra-BIG bug 8O

Psychophanta · Post by **Psychophanta** » Wed Jan 19, 2005 11:00 pm

Admin: Please move this Subject to Bug Reports section.

Saboteur · Post by **Saboteur** » Wed Jan 19, 2005 11:08 pm

But I think you have same problem in C. You must use parenthesis to avoid this. Or what do you want to evaluate first?

Pupil · Post by **Pupil** » Thu Jan 20, 2005 12:02 am

Psychophanta wrote:
Pupil wrote:It seems the binary operators '&' and '|' have the same priority so i assume they just evaluate from left to right, the shift operators('<<' and '>>') however seems to have higher priority than the previously mentioned operators and are thus evaluated first..
But operators should NEVER be evaluated by position in expressions, but by type.
That's an ultra-BIG bug 8O

I think they behave in a logical way, i.e. as i expected them to evaluate, one thing i'm missing though, is a complete list in the manual of the priority order of the operators.

Psychophanta · Post by **Psychophanta** » Thu Jan 20, 2005 10:33 am

Saboteur wrote:But I think you have same problem in C. You must use parenthesis to avoid this. Or what do you want to evaluate first?

Same problem in C ?? Mmm... I'm not sure. If you say that...I didn't know it. However, i think AND operator should have priority over OR operator for logical expressions, and at least in the old Borland C++ there is like that.

Pupil wrote:one thing i'm missing though, is a complete list in the manual of the priority order of the operators.

Yes! Me too.

blueznl · Post by **blueznl** » Sat Jan 22, 2005 12:47 pm

hey psycho, i think the and should have priority above the or... actually, it doesn't matter, as long as it is properly documented!

Blade · Post by **Blade** » Sat Jan 22, 2005 3:31 pm

There are common rules, just like * is higher than +
If any language would start using its own priorities, would be a big mess...

Psychophanta · Post by **Psychophanta** » Sun Jan 23, 2005 7:22 pm

Blade wrote:There are common rules, just like * is higher than +
If any language would start using its own priorities, would be a big mess...

Agree.

Psychophanta · Post by **Psychophanta** » Sun Jan 23, 2005 9:53 pm

blueznl wrote:hey psycho, i think the and should have priority above the or... actually, it doesn't matter, as long as it is properly documented!

Well, yes, i think you're right, corrected my above post