Re: text equation

["Eric Panissard" <EPanissard@xxxxxx>]

Hi Jim,

I don't know "Perl", what is it ? High level langage ?

Thanks,
Eric

-----Message d'origine-----
De : Jim Langston <jlangston@conexfreight.com>
À : MIDRANGE-L@midrange.com <MIDRANGE-L@midrange.com>
Date : mardi 21 décembre 1999 10:54
Objet : Re: text equation


>Hmm... that looks like something Perl would be more
>apt at doing.  Perl is great at parsing.
>
>I can see that would be a big program in RPG if you are
>looking for all possible cases.  You have to look for the
>parenthesis, you have to look at the signs, most mathematical
>formulas use sign hierarchy (* and / before + and -) most are
>left to right, but some are right to left, etc...
>
>That is, 12 * 10 + 3 / 2 can produce a number of answers,
>depending on how you parse it.
>61.5 = ((12 * 10) + 3) / 2 = Left to right
>121.5 = (12 * 10) + (3 / 2) = Hierarchy
>138 = 12 * (10 + (3 / 2)) = Right to left (APL uses this)
>
>and then you get into combinations of hierarchy and left to right
>or right to left.  Most interpreters doe them with hierarchy and
>Left to Right (such as Visual Basic).  I'm not sure what the
>Eval statement does, I would assume the same way.
>
>It doesn't look like a quick program.
>
>Regards,
>
>Jim Langston
>
>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
>
><SNIP>
>
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