Rounding a float to the nearest .5

Question

I need to round a float to the nearest .5, for example:

1.1 = 1
1.5 = 1.5
1.6 = 1.5
1.8 = 2

and so on. I really don't know how to do it. Any help would be greatly appreciated.

@RobertHarvey - Nearest 0.5, not 5, but I guess the link is close enough. — Michael Dorgan, Apr 29 '13 at 15:51
your third example, if rounded to the nearest .5, would be 1.5 not 2. Do you really mean round? — PeteH, Apr 29 '13 at 15:54

score 9 · Accepted Answer · answered Apr 29 '13 at 15:49

9

For positive numbers Multiply by 2, add 0.5, truncate, divide by 2.

answered Apr 29 '13 at 15:49

Michael Dorgan

1 Answers1