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  2. RPG400-L
  3. August 2005

RE: Dumb programming question..

Hi Jon -


 >> That really simplies the equation.

Does it?  I can't help wondering.  If you "simplify" to the point that a
knowledge of algebra is needed before you can understand the relationship of
the code to the original requirement ... then haven't you obfuscated rather
than simplified?

The version ( ( FieldA - 1 ) / FieldA ) * 100 is a direct representation of
the original requirement and there can't be a lot of difference performance
wise.
I agree with you, except for one issue which I haven't seen mentioned (or missed seeing). Because of the intermediate field length issues on divide operations, I would move the divide to the end ... 

( ( FieldA - 1) * 100 ) / FieldA
Since the compiler cannot generate a field with an infinite number of decimal places, it is always best to eliminate or minimize divide operations, and keep them as late in the equation as possible. 

Ken
http://www.ke9nr.net/
Opinions expressed are my own and do not necessarily represent the views of my employer or anyone in their right mind.

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