cem@intelca.UUCP (Chuck McManis) (05/28/85)
> > > I would like to know if anyone has tried this new version (3.0) of > Turbo Pascal in CP/M. An earlier version was flawed in that recursion was > not properly implemented: a procedure that called itself using pass-by- > reference (i.e. passing the parameters using var: name ) did not > work properly, and it was even mentioned in the manual briefly under > "differences between standard Pascal and Turbo Pascal". If anyone knows > if this problem has been solved in the new version, could you please > respond on net.lang.pascal? > > Patrick Strauss Turbo Pascal V2.0 does indeed handle recursion correctly if you set the appropriate compiler directive. The latest Tug Lines has a list of all known bugs in the compiler and recursive use of Var parameters was not one of them. V3.0 for CP/M does not buy you much more than a new manual. (And the manual is somewhat more cryptic since some things that work only on MS-DOS are not indicated as such.) I compared compile times and code speed and came up with nearly identical numbers from 2.0 to 3.0. New features are limited to SeekEOF, Exit, and some command line routines (although you are still limited to the first 32 bytes or so of the command line, everything else gets trashed unless you have the "patch" program) Not at all worth it. Borland, I suspect has been caught up in the lure of big blue. --Chuck -- - - - D I S C L A I M E R - - - {ihnp4,fortune}!dual\ All opinions expressed herein are my {qantel,idi}-> !intelca!cem own and not those of my employer, my {ucbvax,hao}!hplabs/ friends, or my avocado plant. :-}
gbs@voder.UUCP (George Smith) (05/29/85)
> > I would like to know if anyone has tried this new version (3.0) of > > Turbo Pascal in CP/M. An earlier version was flawed in that recursion was > > not properly implemented: a procedure that called itself using pass-by- > > reference (i.e. passing the parameters using var: name ) did not > > work properly ... > > > > Patrick Strauss > > Turbo Pascal V2.0 does indeed handle recursion correctly if you set the > appropriate compiler directive. The latest Tug Lines has a list of all > known bugs in the compiler and recursive use of Var parameters was not > one of them. V3.0 for CP/M does not buy you much more than a new manual. > New features are limited to SeekEOF, Exit, ... > > --Chuck I think there are two different points being addressed here. One refers to the CP/M-80 limitation that local variables may not be passed as VAR parameters in a recursive procedure. This is an implementation deficiency rather than a bug - it is documented on page 319 of the 3.0 manual. The second point refers to the fact that the default condition for the CP/M-80 version of Turbo generates non-recursive code. To turn on the generation of recursive code, you must use the A compiler directive. See page 318 of the 3.0 manual. However, even when recusive code generation is turned on, you may still NOT use local variables as VAR parameters in recursive calls. Also, I think that Version 3.0 is worth upgrading to. The addition of the EXIT statement alone is a boon for people porting code from the UCSD P-System environment. And, as pointed out in the V1#5 issue of TUG LINES, there were quite a few bugs fixed. -- George B. Smith National Semiconductor ...!{ihnp4!nsc | decvax!decwrl!nsc | ucbvax}!voder!gbs
rbt@sftig.UUCP (R.Thomas) (05/29/85)
How does one get hold of Tug Lines (I presume that Tug is some kind of Turbo
User's Group)
Rick Thomas
{akgua,ihnp4,sdcsvax,just about anywhere}!attunix!rbt
> Turbo Pascal V2.0 does indeed handle recursion correctly if you set the
> appropriate compiler directive. The latest Tug Lines has a list of all
> known bugs in the compiler and recursive use of Var parameters was not
> one of them. V3.0 for CP/M does not buy you much more than a new manual.
>
> --Chuck intelca!cem
Re the above -- Has anybody actually tried it?dhenson@islenet.UUCP (Donald D. Henson) (06/01/85)
> How does one get hold of Tug Lines (I presume that Tug is some kind of Turbo > User's Group) > Rick Thomas > {akgua,ihnp4,sdcsvax,just about anywhere}!attunix!rbt > TUG Lines is a newsletter published bimonthly by the Turbo User Group. It is dedicated to articles about Borland Turbo Pascal. You can contact them at: Turbo User Group P.O. Box 1510 Poulsbo, WA 98370 It's been so long since I subscribed that I have forgotten how much the subscription costs, but I remember it being fairly cheap.