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Mailing lists / fpc-pascal / 2005-05

exit ?

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Tony Pelton

hi all,

new pascal guy, but not a new programmer.

i'm used to being able to use the "return" reserved word in Java and 'C' to be able to short circuit the execution of a function/method.

over and above any philisophical judgments on my programming technique, I see Free Pascal has a reserved word 'exit' that mimics "return" ?

Is some analogy to "return" not supported in the official pascal dialect ?

is 'exit' the only way to do this, and obviously, not portable to other compilers ?

is there another token that i could/should use ?

i do know that there is goto/label, but i would prefer not to use that, as that construct has been beat into my head over the years as being very bad.

tia,
Tony

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Jonas Maebe
to Tony Pelton
Tony Pelton wrote
over and above any philisophical judgments on my programming technique, I see Free Pascal has a reserved word 'exit' that mimics "return" ?

Yes.

Is some analogy to "return" not supported in the official pascal dialect ?

exit with a parameter is not supported in other compilers afaik (e.g. exit(5), equivalent to "return 5"). It may exist in Delphi (I've never used Delphi), but it definitely does not exist in Turbo Pascal.

is 'exit' the only way to do this, and obviously, not portable to other compilers ?

Exit without a parameter is supported in Turbo Pascal and Delphi.

is there another token that i could/should use ?

Not that I can think of.

Jonas

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Paul Davidson
to Jonas Maebe
Perhaps combinations of RESULT and EXIT may help?
   if TimeToLeave then begin
     Result := 5;
     Exit;
   end else ....
Jonas Maebe wrote 34 lines
On 25 mei 2005, at 18:20, Tony Pelton wrote: > over and above any philisophical judgments on my programming > technique, I see Free Pascal has a reserved word 'exit' that mimics > "return" ? Yes. > Is some analogy to "return" not supported in the official pascal > dialect ? exit with a parameter is not supported in other compilers afaik (e.g. exit(5), equivalent to "return 5"). It may exist in Delphi (I've never used Delphi), but it definitely does not exist in Turbo Pascal. > is 'exit' the only way to do this, and obviously, not portable to > other compilers ? Exit without a parameter is supported in Turbo Pascal and Delphi. > is there another token that i could/should use ? Not that I can think of. Jonas _______________________________________________ fpc-pascal maillist - http://lists.freepascal.org/mailman/listinfo/fpc-pascal

P Davidson
Corax Networks Inc.
http://CoraxNetworks.com

IMPORTANT NOTICE: This message is intended only for the use of the individual or entity to which it is addressed. The message may contain information that is privileged, confidential and exempt from disclosure under applicable law. If the reader of this message is not the intended recipient, or the employee or agent responsible for delivering the message to the intended recipient, you are notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please notify Corax Networks immediately by email at Thank you.

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Adriaan van Os
to Jonas Maebe: Yes. exit with a parameter is not supported in other compilers afaik (e.g. exit(5),…
Jonas Maebe wrote 5 lines
> Is some analogy to "return" not supported in the official pascal > dialect ? exit with a parameter is not supported in other compilers afaik (e.g. exit(5), equivalent to "return 5").

UCSD Pascal has

EXIT( procedurename)
EXIT( programname)
EXIT( PROGRAM)

Macintosh Pascal compilers support EXIT( procedurename) and EXIT( PROGRAM). EXIT( procedurename) has been implemented in GNU Pascal recently.

> is 'exit' the only way to do this, and obviously, not portable to > other compilers ? Exit without a parameter is supported in Turbo Pascal and Delphi.

Delphi has the built-in "Result" variable and GNU Pascal (also) has "Return".

Regards,

Adriaan van Os

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L505
to Paul Davidson: Perhaps combinations of RESULT and EXIT may help? if TimeToLeave then begin Result := 5;…

One could wonder whether return really exits or not. I guess exit is more obvious. ReturnAndExit is a bit verbose I suppose.

Another thing to do is go

result:=5; Exit;

on the same line

Lars

Earlier message 68 lines
----- Original Message ----- From: "Paul Davidson" To: "FPC-Pascal users discussions" Sent: Wednesday, May 25, 2005 9:39 AM Subject: Re: [fpc-pascal] exit ? | Perhaps combinations of RESULT and EXIT may help? | if TimeToLeave then begin | Result := 5; | Exit; | end else .... | | On May 25, 2005, at 12:33, Jonas Maebe wrote: | | > | > On 25 mei 2005, at 18:20, Tony Pelton wrote: | > | >> over and above any philisophical judgments on my programming | >> technique, I see Free Pascal has a reserved word 'exit' that mimics | >> "return" ? | > | > Yes. | > | >> Is some analogy to "return" not supported in the official pascal | >> dialect ? | > | > exit with a parameter is not supported in other compilers afaik (e.g. | > exit(5), equivalent to "return 5"). It may exist in Delphi (I've never | > used Delphi), but it definitely does not exist in Turbo Pascal. | > | >> is 'exit' the only way to do this, and obviously, not portable to | >> other compilers ? | > | > Exit without a parameter is supported in Turbo Pascal and Delphi. | > | >> is there another token that i could/should use ? | > | > Not that I can think of. | > | > | > Jonas | > | > | > _______________________________________________ | > fpc-pascal maillist - | > http://lists.freepascal.org/mailman/listinfo/fpc-pascal | > | > | P Davidson | Corax Networks Inc. | http://CoraxNetworks.com | | IMPORTANT NOTICE: This message is intended only for the use of the | individual or entity to which it is addressed. The message may contain | information that is privileged, confidential and exempt from disclosure | under applicable law. If the reader of this message is not the | intended recipient, or the employee or agent responsible for delivering | the message to the intended recipient, you are notified that any | dissemination, distribution or copying of this communication is | strictly prohibited. If you have received this communication in error, | please notify Corax Networks immediately by email at | Thank you. | | | _______________________________________________ | fpc-pascal maillist - | http://lists.freepascal.org/mailman/listinfo/fpc-pascal

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