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How do i multiply 2 array index variables given the following

foo=(1 2)
bar=(0.1 0.2)

foobar=$((foo[1]*price[1])) # this is wrong

echo "$foobar"

Current output : 0

Correct/Expected output : 0.4

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closed as off-topic by roadmr, dobey, Aditya, Radu Rădeanu, falconer Jan 10 at 16:48

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1 Answer 1

Aside from the typo (you have used price instead of bar) the main issue is that the shell only performs integer arithmetic. If you want to perform floating-point arithmetic, the easiest way is probably via the bc command e.g.

foobar=$(bc <<< ${foo[1]}*${bar[1]})

for example

$ foo=(1 2); bar=(0.1 0.2)
$ foobar=$(bc <<< "${foo[1]}*${bar[1]}")
$ echo $foobar
.4
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