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Rational numbers operation




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



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