mac_rowe
asked on
My Cardinal is signed !
According to the Delphi 3 Help file, cardinals are meant to be a 32 bit unsigned number.
However it is definately a 32 bit signed number on my system. (WinNT)
Try typing '(cardinal($7FFFFFFF)+1)' in the 'evaluate/modify' window and you will get a range check error instead of the correct answer of $80000000.
Also Cardinal($FFFFFFFF) gives '-1'.
Q1. Is this unique to me or does everyone else have the same issue?
Q2. So how do I get a 32 bit unsigned number? (Simply printing it out differently at the end doesn't help, because the maths in the middle should be correct to)
(For example: $8000 0000 / 2 = ??
Signed: $C000 0000
Unsigned: $4000 0000)
However it is definately a 32 bit signed number on my system. (WinNT)
Try typing '(cardinal($7FFFFFFF)+1)' in the 'evaluate/modify' window and you will get a range check error instead of the correct answer of $80000000.
Also Cardinal($FFFFFFFF) gives '-1'.
Q1. Is this unique to me or does everyone else have the same issue?
Q2. So how do I get a 32 bit unsigned number? (Simply printing it out differently at the end doesn't help, because the maths in the middle should be correct to)
(For example: $8000 0000 / 2 = ??
Signed: $C000 0000
Unsigned: $4000 0000)
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P.S: You should seriously think about upgrading to D4 or D5, because there are tons of other quite important language extensions like int64 (real 64bit integer type), predefined parameters, function/method overloading and more...
ASKER
Hmm, so the Delphi documentation is a lie. Didn't someone notice this before they released it ?
Ironically I use D5 at home but here at work we are on good ol' fashioned D3. When you have several licenses it is quite expensive to upgrade, so I'd like to stick to D3 for the moment, rather than force the entire company to upgrade.
I've found so far the best solution is to turn range checking off and simply pretend that it is unsigned. It is pretty good apart from the division problem mentioned earlier.
I'll check out a couple of possibilities...
Ironically I use D5 at home but here at work we are on good ol' fashioned D3. When you have several licenses it is quite expensive to upgrade, so I'd like to stick to D3 for the moment, rather than force the entire company to upgrade.
I've found so far the best solution is to turn range checking off and simply pretend that it is unsigned. It is pretty good apart from the division problem mentioned earlier.
I'll check out a couple of possibilities...
ASKER
Yes, you get a 'excellent' grade for proving to me that I wasn't mad after all.
Your welcome!
Cheers,
Raymond.
Cheers,
Raymond.
In D4 Borland introduced "real" 32bit unsigned support with cardinal = longWord = 32bit unsigned.
Regards, Madshi.