Path: utzoo!mnetor!uunet!lll-winken!lll-lcc!ames!pasteur!ucbvax!DE0HRZ1A.BITNET!HPA111
From: HPA111@DE0HRZ1A.BITNET ("Michael Drechsler +49  343062", 0201)
Newsgroups: comp.lang.modula2
Subject: CHAR-String compatibility
Message-ID: <INFO-M2%88042209060985@DB0TUI11>
Date: 22 Apr 88 08:43:27 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Reply-To: Info-Modula2 Distribution List <INFO-M2%UCF1VM.bitnet@jade.berkeley.edu>
Organization: The Internet
Lines: 26

Hello,

Given: PROCEDURE P(S : ARRAY OF CHAR);

If I try to call this proc with a CHAR type argument, the compiler I'm
using (M2/CMS for IBMs running VM/CMS; based on a ETH-compiler(?))
flags a "type incompatibility" error.

I think, that a single char should be compatible because it can be seen
as an ARRAY [0..0] OF CHAR. I have nothing found about that problem in
Wirth's book PIM2 ed.3 (german version).

Does anyone of you knows more about that problem? Perhaps in the english
version of the above book?

But if a CHAR as ARRAY [0..0] OF CHAR is compatible to a formal parameter
ARRAY OF CHAR, then the following should also be valid:

calling a PROCEDURE pp(AnyVar : ARRAY OF AnyType);

with a single variable of type "AnyType", because the single variable
in the procedure call can also be seen as an ARRAY [0..0] OF AnyType.

Is this correct?

Thanks for your help,
Michael