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Date:	Mon, 20 Nov 2000 15:51:35 +0800
To:	djgpp AT delorie DOT com
From:	"Nimrod A. Abing" <n_abing AT ns DOT roxas-online DOT net DOT ph>
Subject:	Re: C++ stack
Cc:	lauris007 AT takas DOT lt
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At 12:00 AM 11/20/2000 +0200, you wrote:
>Well, don't laugh at me, but i don't know...
>
>I just know i have to make something like a calculator with C+ and have to
>use stack..
>Am i dumb or is it the lecturer who doesn't understand that it is impossible
>to make a
>stack programme with c+ ?

You only think it's impossible because it seems that you have never tried.
So if your instructor tells you to write a proggy using a stack and
implement it in C++, you should ask yourself (and your instructor): Can I
use (a) STL in this program or (b) do I have to implement a stack class
myself? Is the program (a) TUI/GUI based or (b) command-line based? If you
answered ``b'' to both questions, then you're almost done. Get the book by
the man himself, ``C++ The Language'' by Bjarne Stroustrup, there's an
example there that shows how to build a calculator program from the ground
up. If you need to use STL, there is a stack abstract class there. If you
need a GUI, get Allegro since it implements a simple dialog ``class'' in C.
If you need a TUI, get the curses library.

Also there are three notations used in calculator programs (command-line
based): prefix, infix, and postfix notations. The first two are common. In
prefix notation, operators precede operands and allows calculation without
using parentheses (e.g. + A B). Postfix is similar to prefix, however
operators follow the operands (e.g. A B +). Infix (e.g. A + B) is an
interesting case in that most implementations just convert an infix
expression into prefix or postfix to eliminate the need for parentheses in
the final calculations.

That should provide some insight into calculator programs. Now the
important question (because you have not answered Damian's question): Are
you using DJGPP (with STL) or Visual C++ (with MFC)? If you're using Visual
C++, then I just wasted my time responding to a post by a future MicroSerf
;-P.

Bye.

nimrod_a_abing
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