Hi folks,
I am wondering how to output awk back to a variable.

I am new to Unix/Linux.
I am trying to get rid of a decimal number and put the output back in a variable for further use in the script. here is how I used awk:

var=$1
echo $var |awk '{print $1 *100}' | $var
echo $var

this gives me an error!
I don't necessarily need to use awk any suggestion of other commands that help get rid of the decimal is fine.

your help will be greatly appreciated!
Bashir