Posible HP-49G+ bug using DOLIST.
Message #1 Posted by r. d. bärtschiger. on 17 Nov 2003, 3:39 p.m.
I have just noticed what may be a bug on the hp-49g+. To duplicate it try the following:
1.) Navigate to an empty directory. If your calculator does not have an empty directory,
then create one. You can purge it later.
2.) Place a number on the stack, a 5 for instance. This number is not actually needed,
it will only be used as a place holder.
3.) Execute VARS, this will place an empty pair of curly braces on the stack, { }
4.) Place a 1 on the stack.
5.) Place this program on the stack, \<< DTAG \>>
6.) Execute this command, DOLIST
7.) The stack should now contain:
2: 5.00
1: { }
8.) Execute OBJ\->
9.) The stack should now contain:
3: 5.00
2:
1: 1.00
10.) According to the result the 'empty list' contained one item. That one item is
on stack level 2. However what is shown on level two is a 'blank' item.
The 5 is on level 3.
11.) Normally executing OBJ\-> on an empty list results in a zero on level one with
the list having been deleted.
If the above is tried on an hp-48gx, the execution of DOLIST causes an error.
Any comments?
rdb.
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