# Floating Point Operations | Shell Scripting

**This is a multipart blog article series where I am going to explain the concepts of shell scripting and how to write a shell script in Linux, UNIX or Mac based systems. You can also follow this tutorial blog using windows but for that you have to install a bash from.**

*We cannot solve floating point numbers using simple arithmetic operations. So in this article we will see that how we solve floating point numbers.*

We cannot perform arithmetic operations on decimal using previous methods, it will give an error. For that we use `bc`

which stands for basic calculator.

- We can use bc command in this way
`echo “20.5+5” | bc`

- But there is a problem with division that it will not show the values after decimal. So to remove that we have to define a variable scale like this
`echo “scale=2;20.5+5” | bc`

- Here we can see the value till
`2`

decimal places. - We can also solve/calculate square root of some number and can also solve trigonometric equations using the
`bc`

keyword. - If you want to use variables then the syntax becomes
`echo “$<variable_name1>+$<variable_name2>” | bc`

. Here num1 and num2 are variables which have some value in it. - We can calculate the square root of a number in this way
`echo “scale=2;sqrt($<variable_name>)” | bc -l`

- To calculate we have to use a function called sqrt and pass the variable name to it, whose square root we want to calculate.
- But sqrt function is a math function and we need to call. To call math function we use
`-l`

command. - We can also calculate power of any number like this
`echo “scale=2;3^3” | bc -l`

- You can get more information about
`bc`

command by just typing`man bc`

in terminal.

Reference code file for this article

*So this was all about performing arithmetic operations on floating point numbers. Hope you liked it and learned something new form it.*

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