Re: How do I round number to x decimal places eg to round 12.5000 0009 to 12.5

["bestworldweb" <bestworldweb@...>]

thanks for the help

--- In lua-l@yahoogroups.com, John Mckenna <jmckenna@r...> wrote:
> From: bestworldweb [mailto:bestworldweb@y...]
> 
> >How do I round number to x decimal places eg to round 12.50000009  to
> >12.5?
> 
> Easy!  Multiply the number by a power of 10 to get all of the digits you
> want to keep above the decimal point.  Truncate it to an integer.  Then
> divide to get everything back where it started:
> 
> x = 12.50000009
> digits = 1		-- you want 1 digit after the decimal point
> 
> shift = 10 ^ digits
> result = floor( x*shift + 0.5 ) / shift
> 
> I'm adding 0.5 so it rounds (12.5400009 would become 12.5,
12.55000009 would
> become 12.6)
> -Virus scanned and cleared ok