Rounding Numbers To The Nearest Half

[P3rL]

I would like to find out how i can round numbers to the nearest next half.

example: if i have 4.23 i would like to round it off to 4.5.

I have looked in other posts and I have only seen how to round off to the nearest full number.

I need this in a rating script which will rate things out of 10 or out of 5.

Thank you n advance.

 

[stakadush]

you need the module Math::Round
for more information go to:

http://search.cpan.org/search?dist=Math-Round

 

[raider2001]

You can get to the nearest tenth, by using sprintf.

$num = sprintf("%.1f", $num);

 

[tsdragon]

This sounds like a great challenge. What IS the best generic algorith for rounding to the nearest, or nearest NEXT half, quarter, etc?

Here's the best I can come up with on short notice: add .5 and subtract the modulus (remainder) .5:

$rounded = $amt + .5;
$rounded = $amt - ($amt % .5);

This would round any fraction from .1 to .5 up to .5, and any fraction from .6 to .9 to 1.0. It's not fully tested, but I think it will work.
Tracy Dryden
tracy@bydisn.com

http://www.bydisn.com

Meddle not in the affairs of dragons,
For you are crunchy, and good with mustard.