[fpc-pascal] Endian & Hex numbers

Michael Van Canneyt michael at freepascal.org
Mon Apr 13 15:15:17 CEST 2015

On Mon, 13 Apr 2015, Torsten Bonde Christiansen wrote:

> Hi list.
> Please forgive me if this is too dumb a question, but:
> When using a const written in hex, is the order significant?
> Ie. will eg. $1F01 result in the same value (7937) on both big-endian and little endian machines?

It will be stored differently in memory, but the representation of the value is the same, regardless of the storage.

> Likewise, if I use an absolute reference to a variable is the endianness also significant?
> ex.:
> const
>   A: SmallInt = $1F01;
> var
>   B: array[0..1] of byte absolute A;
> Will B[0] be the same on both types of endian machines?

No, because here you actually access the memory, and the memory layout will differ.


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