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From: tom@vrdxhq.UUCP
Newsgroups: comp.sys.ibm.pc,comp.lang.c
Subject: Assigning to Pointers
Message-ID: <3537@vrdxhq.UUCP>
Date: Tue, 28-Apr-87 12:56:50 EDT
Article-I.D.: vrdxhq.3537
Posted: Tue Apr 28 12:56:50 1987
Date-Received: Thu, 30-Apr-87 01:48:05 EDT
Organization: Verdix Corporation, Chantilly, VA
Lines: 45
Xref: utgpu comp.sys.ibm.pc:3221 comp.lang.c:1879


This may be a dumb question, but could someone please explain
to me how I assign an absolute address to a pointer to an array?

I'm trying to overlay various structures and arrays at different
times on top of the physical page frame in EMM.

I'm using MSC 4.0

I want to do the following :


int *aa[];


aa = 0x50000;


-- or even better --

struct POINTER_PARTS
  {
    unsigned offset_part;
    unsigned segment_part;
   }

union POINTER_ACCESS
  {
     struct POINTER_PARTS pp;
     int *far_pointer;
   }

union POINTER_ACCESS upa;


upa.pp.segment_part = 0x5000;
upa.pp.offset_part = 0x0;

aa = upa.far_pointer;


===

I keep getting "need lvalue" type errors.  Any help anyone can provide,
or comments on my code example, are greatly appreciated.