Short: Postfix Expression Calculator
Author: Daniel Charles Kovacs
Uploader: dkovacs cyberbeach net
Type: misc/math
Architecture: m68k-amigaos
This is a semi-functional postfix expression calculator for Amigados.
What is postfix?
The opposite of infix ;)
Postfix expressions are written differently than regular expressions, but we
have all done them in the past (as early as grade 1). Here is what I mean:
Normal (infix) math:
2 + 2 = 4
Postfix
2
+2
--
4
Operations always follow the numbers. Consider this evaluation:
(3+4)*(2+3) = 35
it would be written in postfix (for the this program)
3 4 add 2 3 add mul
The program offers the following operations:
add, subtract, multiply, divide (with zero-checking), negate, absolute
value, sine, cosine, tangent, inverse tangent, and PI.
Usage:
Double click on the postfix icon. A window will open awaiting your input,
type help and press enter to get a list of operations. Type quit to exit
the calculator, show to display the result and clear to empty the stack.
Distribution:
Give it to anyone, except not for money.
Contact:
Daniel Kovacs
106 Main St.
Lion's Head
Ontario Canada
N0H 1W0
(519) 793 4431
(705) 523 0899
dkovacs@cyberbeach.net
http://www.cyberbeach.net/~dkovacs