Rounding to the nearest 0.05

Ruby
1

Hey guys.

Having difficulty figuring out where to begin with trying to round a
calculation to the nearest 0.05. Can anyone offer any suggestions
please?

Kind Regards

Pete

2

On Oct 26, 1:19 pm, Peter R. [email protected] wrote:

Having difficulty figuring out where to begin with trying to round a
calculation to the nearest 0.05. Can anyone offer any suggestions
please?

irb(main):016:0> 10.times{
irb(main):017:1* n = rand
irb(main):018:1> rounded = (n * 20).round / 20.0
irb(main):019:1> puts “%.02f” % rounded
irb(main):020:1> }
0.95
0.05
0.70
0.50
0.30
0.35
0.95
0.25
0.75
0.45

3

Peter R. writes:

Hey guys.

Having difficulty figuring out where to begin with trying to round a
calculation to the nearest 0.05. Can anyone offer any suggestions
please?

Kind Regards

Pete

Posted via http://www.ruby-forum.com/.

Just off-hand, my initial reaction would be:

(a * 20).round.to_f/20

where “a” is your variable. Some quick tests with irb seems to show
this as working.

Coey

4

Just off-hand, my initial reaction would be:

(a * 20).round.to_f/20

where “a” is your variable. Some quick tests with irb seems to show
this as working.

Coey

Cheers for the quick response guys, much appreciated. What difference
would the .to_f make between these solutions?

5

Quoth Peter R.:

would the .to_f make between these solutions?

Posted via http://www.ruby-forum.com/.

One solution used (expr).to_f/20, the other used (expr)/20.0.
Both of these ensure floating point division is used instead of integer
division, that’s all.

6

Konrad M. wrote:

Quoth Peter R.:

would the .to_f make between these solutions?

Posted via http://www.ruby-forum.com/.

One solution used (expr).to_f/20, the other used (expr)/20.0.
Both of these ensure floating point division is used instead of integer
division, that’s all.

Ahhhh ok thanks for clearing that up!

7

On Oct 26, 2:48 pm, Zoltar S. [email protected] wrote:

Just out of interest how did you get 20 as the number to multiply and
divide by?! Sorry its been a heavy week :-s

1 / 0.05 #=> 20

8

Gavin K. wrote:

On Oct 26, 2:48 pm, Zoltar S. [email protected] wrote:

Just out of interest how did you get 20 as the number to multiply and
divide by?! Sorry its been a heavy week :-s

1 / 0.05 #=> 20

Ace cheers!

9

Just out of interest how did you get 20 as the number to multiply and
divide by?! Sorry its been a heavy week :-s