Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!ukma!psuvm.bitnet!rice.bitnet!storkel
From: STORKEL@RICE.BITNET (Scott Storkel)
Newsgroups: comp.sys.mac.programmer
Subject: I thought I knew C, but...
Message-ID: <341STORKEL@RICE>
Date: 27 May 88 16:29:42 GMT
Organization: Rice University - ICSA
Lines: 36

Okay, I give up. Could somebody please explain the following problem to me?
I tried to compile the following piece of code using  MPW C:

void convertfile()
{
     SFReply        myreply;
     Point          where;
     SFTypeList     mylist;

     where.v=40;
     where.h=40;
     mylist[0]="WORD";
     SFGetFile(&where, "File to convert?",nil,1,mylist,nil,&myreply);
}

Looks like it should put up an SFGetFile dialog box listing only MacWrite files
right? WRONG. When compiling, it gives a "warning: illegal combination of
pointer and integer" error on the line containing   mylist[0]="WORD". So, I
try all kinds of things to fix it, until I've almost driven myself crazy. Then
I change the offending line to the following:

     mylist[0]='WORD';

Just changing the double quotes to single quotes makes everything work fine. No
compiler warnings, and MacWrite files do  indeed show up in the dialog box.

So, my question is WHY? What is the big difference between single and double
quotes, and how do you know when to use them? If someone could please enlighten
me I would greatly appreciate it. Please e-mail responses directly to me if
possible.

Thanks,
Scott Storkel
Macintosh Software Development
Rice University
Houston, Texas