Re: What is wrong with this code?

FROM : John Stiles
DATE : Fri Jun 23 22:33:12 2006

Without really considering the error you're experiencing, I'd say an 
easier implementation would be
   return floor(x * 4.0 + 0.5) / 4.0;

If you want to round down instead of to nearest:
   return floor(x * 4.0) / 4.0;

Or round up this way:
   return ceil(x * 4.0) / 4.0;

You can change the rounding by replacing "4.0" with "1.0 / 
roundAmount". (e.g. 1.0 / 0.25 == 4.0)


On Jun 23, 2006, at 1:28 PM, Brad Bumgarner wrote:

> I am in the process of converting an Applescript Studio app I wrote 
> a couple of years ago to ObjC (as a learning experience). The 
> following code doesn't compile and I'm not sure why. What I want to 
> do is round a float to the nearest .25 (quarter inch). Here is the 
> code:
>
> - (float)roundToNearestQuarter: (float)numberToRound {
>     
>     float decimalNumber;
>     int intNumber;
>     
>     decimalNumber = (numberToRound * 100) + 125;
>     intNumber = decimalNumber - (decimalNumber % 25); // error: 
> invalid operands to binary %
>     return intNumber / 100;
> }
>
> What do I need to change to make this work?
>
> Thanks,
> Brad Bumgarner, CTA
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