Integer range

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2 total messages Started by HJK Fri, 03 Sep 2004 07:05

#908

Author: HJK
Date: Fri, 03 Sep 2004 07:05

30 lines
1775 bytes

Cardinal integer should work with values from 0 to 4294967296

I got a problem with large integers ( Delphi 6 , WIN2000).

var
myvalue: Cardinal

begin
myvalue:4294967296 ;
end;

I get a "Constant expression violates subrange bounds" when compiling this
code.

What I really want to do is to calculate the value of a 32-bit number from
four bytes.

myvalue:=16777216*byte3+65536*byte2+256*byte1+byte0);    hvor byte0 er LSB,
byte3 MSB.
Every byte could have the value 255.

myvalue:=16777216*255 (i.e. (2^24)*255) also results in compiler error.
My program crashed some times
when I tried to use the code for calculating 32bit value from four bytes. I
suspect that the byte3 (MSB) has got
a high value when this happen and thats why I tested with a value of 255 in
all bytes.


Anyone got a solution for this problem  ?

Re: Integer range

#909

Author: HJK
Date: Fri, 03 Sep 2004 07:18

42 lines
2210 bytes

"HJK" <nospam@online.no> wrote in message
news:MIUZc.4853$g%5.70832@news2.e.nsc.no...
> Cardinal integer should work with values from 0 to 4294967296
>
> I got a problem with large integers ( Delphi 6 , WIN2000).
>
> var
> myvalue: Cardinal
>
> begin
> myvalue:=4294967296 ;
> end;
>
> I get a "Constant expression violates subrange bounds" when compiling this
> code.
>
> What I really want to do is to calculate the value of a 32-bit number from
> four bytes.
>
> myvalue:=16777216*byte3+65536*byte2+256*byte1+byte0);    hvor byte0 er
LSB,
> byte3 MSB.
> Every byte could have the value 255.
>
> myvalue:=16777216*255 (i.e. (2^24)*255) also results in compiler error.
> My program crashed some times
> when I tried to use the code for calculating 32bit value from four bytes.
I
> suspect that the byte3 (MSB) has got
> a high value when this happen and thats why I tested with a value of 255
in
> all bytes.
>
>
> Anyone got a solution for this problem  ?
>
>

The value should be myval:=4294967295  not 4294967296
myval:=2013265920 also results in "Constant expression violates subrange
bounds"

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