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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 '14 at 16:48

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "This is not about Ubuntu. Questions about other Linux distributions can be asked on Unix & Linux, those about Windows on Super User, those about Apple products on Ask Different and generic programming questions on Stack Overflow." – roadmr, dobey, Aditya, Radu Rădeanu, falconer
If this question can be reworded to fit the rules in the help center, please edit the question.

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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