Re: Rational numbers operation

["Benjamin R. Haskell" <zsh@xxxxxxxxxx>]

On Wed, 16 Sep 2009, tartifola@xxxxxxxxx wrote:

> 
> 
> Hi,
> a newbie question on operations with rational numbers with the zshell. 
> If I try from the shell
> 
> >echo $((100.5 * 0.001 )) 
> 
> I got the correct result without any error. On the contrary if I try the same thing in script I get this error
> 
>  syntax error: invalid arithmetic operator (error token is ".5 * 0.001 ")
> 
> I'm sure I'm missing something very basic, any hints?
> Thanks

Perhaps you're not using the shell you think you are:

$ zsh -c 'echo $((100.5 * 0.001))'
0.10050000000000001
$ sh -c 'echo $((100.5 * 0.001))'
sh: 100.5 * 0.001: syntax error: invalid arithmetic operator (error token 
is ".5 * 0.001")

Best,
Ben