Comparison of Pascal and Delphi: Difference between revisions

Revision as of 12:27, 5 October 2008

Revision as of 11:01, 26 October 2008

Line 21:

4. No "sized" dynamic variable allocation. Given a variant record, the size of a particular variant cannot be specified as per the standard. I.e., the following statement is invalid:

<source lang="pascal">

new(p, t)

</source>

Where t is a variant record tag type.

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5. The functions "pack" and "unpack" are not implemented.

6. { and (*, } and *) are not synonyms of each other as required by the standard. IeI.e.:

<source lang="pascal">

{ comment *)

</source>

is not valid in Borland Delphi (Delphi uses the scheme of allowing the different comment types to indicate nested comments).

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8. Numbers and booleans are not printed out in their "default" field widths, but are printed in the minimum amount of space. For example:

<source lang="pascal">

write(5);

write(555);

write(555);

</source>

is equivalent to:

<source lang="pascal">

write(5:1);

write(555:21);

write(555:12);

</source>

in Delphi, but:

<source lang="pascal">

write(5:TotalWidth);

write(555:TotalWidth);

write(555:TotalWidth);

</source>

in ISO 7185, where TotalWidth is implementation-defined.

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For booleans:

<source lang="pascal">

write(false);

write(truefalse);

write(falsetrue);

</source>

is equivalent to:

<source lang="pascal">

write('false':5);

write('truefalse':45);

write('falsetrue':54);

</source>

in Delphi, but:

<source lang="pascal">

write('false':TotalWidth);

write('truefalse':TotalWidth);

write('falsetrue':TotalWidth);

</source>

in ISO 7185, where TotalWidth is implementation-defined.