Bash Scripting

Question

I just started Kali and I'm learning bash scripting at the moment. Please how can I use float numbers?
I'm really confused about the concept.

Answer 1

bash does not support floating-point arithmetic by default, but you can use external tools for this

Answer 2

please what kind of external tools?

Let's say I'm trying to calculate the area of a trapezium

echo "Area of a Trapezium"

read -p "length on one side" a

read -p "length on the other side" b

read -p "height of the trapezium" h

echo "Area of trapezium: $(( 1/2 * (a+b) * h" | bc))

What's wrong with the code?
I know it's incorrect but I don't know how to correct it.

Answer 3

https://unix.stackexchange.com/questions/40786/how-to-do-integer-float-calculations-in-bash-or-other-languages-frameworks