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dc: Undocumented feature ?
From: |
Judicael Courant |
Subject: |
dc: Undocumented feature ? |
Date: |
Fri, 22 Sep 2000 12:50:57 +0200 |
Hi,
I am trying to use dc as a pedagogical tool in a compilation course (I
want my students to see how they would compile simple arithmetic
expressions to dc).
I noticed that "s" is understood as an instruction by dc (It does not
answer that 's' is unimplemented) but it is nowhere described in the
info documentation. Is this a bug of dc or of its documentation ?
BTW, what "s" does is very interesting: it discards the top of the stack
which is clearly an interesting feature for dc (no such feature seems to
be described in the doc).
pc87:~/> dc
1 # Lines marked with # are the input I typed
2 #
3 #
4 #
f #
4
3
2
1
s # discards the top of the stack, undocumented
f #
3
2
1
t # this command is rejected, this is consistent with the doc
dc: 't' (0164) unimplemented
Truly yours,
Judicaël Courant.
PS : BTW, thanks a lot for all the software you provide!
--
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Tim, matricule #929, condamné à mort.
http://rozenn.picard.free.fr/tim.html
- dc: Undocumented feature ?,
Judicael Courant <=