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From: mark@hpcllmr.HP.COM (Mark Rozhin)
Newsgroups: comp.lang.pascal
Subject: Re: Pascal Exception Handling
Message-ID: <950024@hpcllmr.HP.COM>
Date: 23 Mar 89 19:17:03 GMT
References: <236@bk.dk>
Organization: Hewlett-Packard Calif. Language Lab
Lines: 25

the draft for ansi extended pascal contains nothing on exception handling.

hewlett-packard pascal has defined a structured statement called try/recover.
anything that goes wrong in the try part of the statement (including anything
called from the try part) casues execution to 'jump' to the recover
part. this gives you a nice envelope to enclose any code.

there are some predefined routine to cause an error (called an escape)
explicitly and to find out what the last error was.

for example:

   try
      <stuff>
      <stuff>
      if (<something>) then
	 escape( <number> );
      <stuff>
   recover
      case escapecode of
	 <stuff>

let me know if you want to know more.

m