dc: Undocumented feature ?

[Judicael Courant]

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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