CODEWITHSUNDEEP
perlintdivision
Jim
Jim

Reputation: 19582

Find the next multiple of a number

I want to find (given a number that could be a float) how to find the next multiple of 60.
I am doing the following which works: 

my $nextMultiple = int($input/$constant);                                                                                                                                         
$nextMultiple = ((int($nextMultiple/60)) * 60);                                                                                                                                   
$nextMultiple += 60;

I actually add 60 in the last line on purpose. Is there a better way for this?

Upvotes: 1

Views: 810

Answers (2)

ikegami
ikegami

Reputation: 386461

Next highest:

 #  121 =>  180    -119 =>  -60
 #  120 =>  180    -120 =>  -60
 #  119 =>  120    -121 => -120

 $n - ($n % 60) + 60

Next largest:

 #  121 =>  180    -119 => -120
 #  120 =>  180    -120 => -180
 #  119 =>  120    -121 => -180

 $n + ( $n >= 0 ? +1 : -1 ) * ( 60 - (abs($n) % 60) )

$n % 60 == 0 will tell you if $n is a multiple of 60.

Upvotes: 2

cjm
cjm

Reputation: 62109

If you want multiples of 60 to be unchanged:

use POSIX 'ceil';

my $next_multiple = ceil(($input/$constant)/60) * 60;

If you want multiples of 60 to be bumped up to the next multiple (as your existing code does):

use POSIX 'floor';

my $next_multiple = (1 + floor(($input/$constant)/60)) * 60;

Upvotes: 1

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