Re: text equation

[Larry Bolhuis <lbolhui@xxxxxxx>]

There was a presentation many many moons ago at COMMON that did this.  It was a
two piece process.  Piece one translated the equation from infix notation
(parenthesis and signs between the factors) to reverse polish notation (RPN) 
also
referred to as Postfix notation.  Postfix is very easy to evaluate.  We
implemented this for custom costing routings for a large printing company.  I do
remember having at least source listings of this stuff somewhat recently but
don't think I have magnetic copies available.  I do recall that the code was not
all that complicated and involved some simple stack handling.  This code was all
RPGIII level too and should be simpler now with the string handling available.

Interestingly when we evaluated performance using the stored postfix expressions
instead of compiled expressions did not affect run time noticably.

I will look for the printed source.  If I recall there was only a couple pages 
of
code.

 - Larry

Eric Panissard wrote:
> 
> Hi everybody,
> 
> I am looking for an RPG sub-program who can recognize and calculate a text
> equation like :
>     (250*(12+45.5))-10
> 
> the equation can contain : the 4 basic operation, decimal point, multiple
> parenthesis
> 
> Eric Panissard
> EPanissard@idt.pf
> 
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-- 
Larry Bolhuis         |         What if it's True?
Arbor Solutions, Inc  |
(616) 451-2500        |  
(616) 451-2571 -fax   | 
lbolhui@ibm.net       |
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