2009/10/6 章宏九 <secludeds...@gmail.com>: > In the document > (http://www.freepascal.org/docs-html/ref/refsu15.html#x38-450003.3.2) > I read the code below: > > Type > MyRec = Record > X : Longint; > Case byte of > 2 : (Y : Longint; > case byte of > 3 : (Z : Longint); > ); > end; > > I still cannot understand what do these two "byte" mean. I have > difficulty in understanding "The optional identifier in the case > statement serves to access the tag field value, which otherwise would > be invisible to the programmer" and need some explain. Thank you.
Look at the second example on this page: http://delphibasics.co.uk/RTL.asp?Name=Record > > Another problem is about Object and Class. I notice that in wiki > (http://wiki.freepascal.org/Object_Oriented_Programming_with_FreePascal_and_Lazarus), > Class is explained as a pointer to the structure, while Object returns > the whole structure. And the wiki said that Object is not used very > much. Does this mean that Object is deprecated? Can Objects contain > any properties? Look at this page for an explanation of the basic difference: http://freepascal.org/docs-html/ref/refch6.html I can't really comment on the scary details, since I'm rubbish at object oriented programming :) Henry _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-pascal
