## Re: [stella] Rounding with DASM?

 Subject: Re: [stella] Rounding with DASM? From: Adam Wozniak Date: Wed, 1 Dec 2004 10:43:52 -0800 (PST)
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On Wed, 1 Dec 2004, Dennis Debro wrote:
> [(3 * 256 / 16)* 6] / 5
> Is there a way for DASM to evaluate this as 58 instead of 57?

I assume you're rounding to the nearest whole number...

5 isn't easily divisible by 2, so let's change your original equation
by multiplying top and bottom by 2.

[(3 * 256 / 16)* 6 * 2] / 10

Now, to get the rounding, add 5 (half your denominator) to the numerator before
you divide:

([(3 * 256 / 16)* 6 * 2] + 5) / 10

This will get you rounded to the nearest whole number.

In the general case...

If you've got

N/D

and you want a rounded to the whole number result, compute

(2*N+D) / (2*D)

- --

"Feminist?  Why would I want to alienate half the population?  I'm an egalitarian."

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