Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!uwvax!tank!uxc!iuvax!watmath!watdragon!djsalomon
From: djsalomon@watdragon.waterloo.edu (Daniel J. Salomon)
Newsgroups: comp.lang.modula2
Subject: Re: type conversion question
Message-ID: <14226@watdragon.waterloo.edu>
Date: 1 Jun 89 17:06:27 GMT
References: <2027@csuna.csun.edu>
Reply-To: djsalomon@watdragon.waterloo.edu (Daniel J. Salomon)
Organization: U. of Waterloo, Ontario
Lines: 18

In article <2027@csuna.csun.edu> abcscagz@csuna.csun.edu (Jeff Boeing) writes:
>
>I couldn't find this anywhere in Wirth's book (4th edition), so here goes:
>
>How do you convert from a cardinal or integer type to an enumerated type?
> ...          If x is of my enumerated type, it's easy enough to save
>it to a file by saying "WriteInt (ORD(x))" (after redirecting output, of
>course), but how do I read that value back in?
>

Use the standard procedure VAL.  E.g.
     ReadInt (i);
     enumvar := VAL (enumtype, i);
See section 10.2 of "Programming in Modula-2" by Niklaus Wirth.

A better book (clearer and a lot shorter) is "Modula-2 for Pascal
Programmers" by Richard Gleaves, section 11.6.  This book has a
usable index, not like Wirth's book.