Need help with printf in bash shell

[peterever]

This is puzzling me.

$ x=165
$ printf "%2.1f\n" $[$x/10]
16.0

The result is 16.0 instead of 16.5.

If I put

$ printf "%2.1f\n" $[$x/10.0]
bash: 165/10.0: syntax error: invalid arithmetic operator (error token is ".0")

So what should I do to get the correct result, which is 16.5?

[tpl]

welcome to the forum

because '/' truncates the quotient, you need to
pick up the remainder: like this

printf "%2.1f\n" $[$x/10].$[$x%10]