A sample for arithmetical expression evaluation

C

coldraymagic

New Member

• Jan 21, 2009

• #1

A sample for arithmetical expression evaluation.(the sample supported function)

 

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D

Deleted member 103

Guest

• Jan 21, 2009

• #2

Hi coldraymagic,

i think the bills are not right.


Ciao,
Filippo

 

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klaus

Expert

Licensed User

Longtime User

• Jan 21, 2009

• #3

I agree with Filippo, unfortunately your math evaluator doesn't take into account the order of operations Order of operations - Wikipedia, the free encyclopedia !

In Filippo's examples:
sqrt(9) + 2 ^ 2 = 3 + 4 = 7 and not 25
the sqrt operation AND the ^ operation must be executed before the + operation !
your calculation is equivalent to
(sqrt(9) + 2) ^ 2 = 25

Best regards.

 

Last edited: Jan 22, 2009

R

Rioven

Active Member

Licensed User

Longtime User

• Jan 22, 2009

• #4

Hi coldraymagic,
You may revise your code according to 'order of operations' and come up with solution rather than mine here-> http://www.b4x.com/forum/code-samples-tips/1207-scientific-math-text-input-evaluator.html#post6290 or perhaps debug, further investigate and optimized my code.

Hi Klaus,(typo) it is 7 not 9

Regards,

 

klaus

Expert

Licensed User

Longtime User

• Jan 22, 2009

• #5

Hi Rioven,

Thank's for the 'bug report', I corrected the value in my post.
It seems that I was more concentated on the principle rather than on the result? But anyway this one must be correct !

Best regards.