Answer: How do I round a number?


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Answer: How do I round a number?

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Q&A > math > How do I round a number? contributed by fundflow

The guy asked to round a number, the simplest way is (my highschool teacher would be proud now..): $rounded = int ( $orig + 0.5 )
This approach floors any decimal portion less than 0.5, and rounds up (in value) any decimal portion greater than .5. That means the following:

 1.1 rounds to 1.0.
 1.5 rounds to 2.0.
-1.1 rounds to 1.0.
-1.5 rounds to 1.0.
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RE: Answer: How do i round a generated number in Perl? ...math.round (as in javascript) ...? by lhoward (Vicar) on Jul 26, 2000 at 00:27 UTC
This concept presented above can be expanded to round to more (or less) percision than just "round number to nearest integer". i.e. Round to nearest hundred (100): `$rounded=100int(0.5+$number/100);` [download] Round to nearst tenth (0.1): `$rounded=0.1int(0.5+$number/0.1);` [download] etc...	[reply] [d/l] [select]
Re: Answer: How do I round a number? by I0 (Priest) on Dec 16, 2000 at 02:38 UTC
`$rounded = int ( $orig + 0.5 )` assumes $rounded is positive. More generally: `use POSIX; $rounded = floor ( $orig + 0.5 )` or `$rounded = sprintf( "%.f" , $orig )` to properly handle the half-way case See also `perldoc -q round`	[reply] [d/l] [select]

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