How to write mathematical formula in Linux Shell Scripting

linuxmantra · 12-05-2013, 01:32 PM

I am writing a code to calculate the profit and loss.
For example, I want to write a equation as
profit = (SP - CP)/ Cp

or any other complex mathematical equation.

How can I write these equation in linux shell script.

suicidaleggroll · 12-05-2013, 01:43 PM

send it to a program that can do math:

Code:

profit=$(echo "(SP - CP) / Cp" | bc -l)

Of course replacing SP, CP, and Cp with actual numbers or variables containing their values.

jdkaye · 12-05-2013, 02:30 PM

There are loads of tutorials around to help you learn to use arithmetic expressions in scripts. Here's one example. You can easily find many more.
jdk

linuxmantra · 12-05-2013, 02:36 PM

echo "Enter cost price"
read cp
echo "Enter selling price"
read sp
if [ $cp -gt $sp ]
then
echo "Loss percent" `expr (($cp - $sp ) / $cp) /*100`"
else
echo "Profit percent" `expr (($sp - $cp ) / $cp) /*100`"
fi

-- Need Help to degbug the code----

rknichols · 12-05-2013, 04:25 PM

Keep in mind that the shell and expr perform only integer arithmetic, so you either have to scale the input and format the output appropriately or else do the calculation in a program like bc that understands floating point.

grail · 12-05-2013, 06:53 PM

Was there a question in post #4? What help is it you need?