Round number up to the nearest multiple of 3

Question

Hay, how would i go about rounded a number up the nearest multiple of 3?

ie

25 would return 27
1 would return 3
0 would return 3
6 would return 6
         


        

Answer 1

This function will round up to the nearest multiple of whatever factor you provide. It will not round up 0 or numbers which are already multiples.

round_up = function(x,factor){ return x - (x%factor) + (x%factor>0 && factor);}

round_up(25,3)
27
round up(1,3)
3
round_up(0,3)
0
round_up(6,3)
6

The behavior for 0 is not what you asked for, but seems more consistent and useful this way. If you did want to round up 0 though, the following function would do that:

round_up = function(x,factor){ return x - (x%factor) + ( (x%factor>0 || x==0) && factor);}

round_up(25,3)
27
round up(1,3)
3
round_up(0,3)
3
round_up(6,3)
6