Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!uunet!willett!ForthNet
From: ForthNet@willett.UUCP (ForthNet articles from GEnie)
Newsgroups: comp.lang.forth
Subject: Advanced Beginners
Message-ID: <535.UUL1.3#5129@willett.UUCP>
Date: 23 Feb 90 23:19:12 GMT
Organization: Latest link in the ForthNet chain.  (Pgh, PA)
Lines: 23


 Date: 02-22-90 (08:50)              Number: 2941 (Echo)
   To: IAN GREEN                     Refer#: 2939
 From: STEVE PALINCSAR                 Read: NO
 Subj: FORTH                         Status: PUBLIC MESSAGE

 Ian, the words are ! (store) and @ (fetch).  Before discussing their 
 usage, I must explain that the default behavior of a forth variable is 
 to place its address on the stack.  Now let's define a variable: 
 VARIABLE SNIP <cr>
 When we invoke SNIP what we do is place its address on the stack.
 To store 5 at the memory location we've established with SNIP we simply 
 put 5 on the stack, put SNIP's address on the stack by invoking its 
 name, and then use the ! operator:  5 SNIP !   The stack diagram for !
 is ( n addr -- ) which indicates that it wants an integer value with
 an address on top of it as its stack arguments; after execution, no
 arguments are returned.

 SNIP @ will put the value stored at SNIP on the stack.  @'s stack 
 diagram is ( addr -- n ).
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