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Int64 Constants Range

Posted on 2001-07-22
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Last Modified: 2012-06-27

I wonder why Delphi will not allow me to input this number in my source code (as a constant):

i := -9223372036854775808;

"i" is defined as a Int64 and should actually be able to hold this value! Most remarkable is that this works though:

i := -9223372036854775807-1;
ShowMessage(IntToStr(i));

And this code also displays exactly the number I could not enter?! So appearantly Delphi programs can handle this large negative number, but the IDE will not allow you to enter them?

Am I missing something here? I think this is weird?!

I'm not stuck or anything, my program works but.. I just wonder if anyone knows *why* Delphi behaves like this??


/m
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Question by:requiem
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4 Comments
 
LVL 17

Accepted Solution

by:
inthe earned 25 total points
ID: 6306587
strange ,you can also do it this way:

const
i : int64 =low(int64);
begin
showmessage(inttostr(i));

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Expert Comment

by:scrapdog
ID: 6306687
I would think that the error is in the parser...maybe the parser only allows the 19th digit in int64 literals to be <= 7 (instead of 7 for positive and 8 for negative).
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Author Comment

by:requiem
ID: 6379813
I guess this one will be unsolved.
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LVL 1

Expert Comment

by:vissim
ID: 22763027
Did you test iint64tostr( )    function ?
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