Rounding up to two decimal places

Rails
1

Hi there

I am going to calculate VAT at one of my websites, and UK VAT is 17.5
%.
So the question is how to round up some value to two decimal points?

I often get values like 6,991…

In php I was using round function

round($price, 2)

is in ruby something similat to PHP’s round function where I could
specify number of decimal places ?

P.

2

On 9/16/07, pgega [email protected] wrote:

Hi there

I am going to calculate VAT at one of my websites, and UK VAT is 17.5
%.
So the question is how to round up some value to two decimal points?

one way is to use round(n * 100) / 100.0

3

n would be your number, then multiplying it by 100 and rounding it would
round it to 2 decimal places, then divide it by 100 to get your decimal
back…

n = 12.3456
n * 100 = 1234.56
round(n) = 1235
1235 / 100 = 12.35

4

On Sep 16, 8:54 am, pgega [email protected] wrote:

Thanks,

And which part of the code corresponds for the number of decimal
places I want to round?

in Ruby, it is like (n * 100).round / 100.0

it is like (n * 102).round / (102).to_f

the 2 is the one you want and 10**2 is 10 to the power of 2.

5

and as I assume n is my value I want to round ?

6

On 9/16/07, kendear [email protected] wrote:

So the question is how to round up some value to two decimal points?

one way is to use round(n * 100) / 100.0

in Ruby, it is like (n * 100).round / 100.0

7

n = 12.3456
n * 100 = 1234.56
round(n) = 1235
1235 / 100 = 12.35

So clear , so easy.
Thanks a lot.

8

sorry, line 3 should be n.round()

9

Thanks,

And which part of the code corresponds for the number of decimal
places I want to round?
(I am sorry sorry for killing you, I am just a small designer.)