11-Arithmetic-Operations.md

Arithmetic Operations

• Take me to Video Tutorial

In this section, we will take a look at "Arithmetic Operations"

• There are different methods with which we can perform arithemetic operations

expr

• For addition

  $ expr 6 + 3
  

• For substraction

  $ expr 6 - 3
  

• For Division

  $ expr 6 / 3
  

• For Multiplication

  $ expr 6 \* 3
  

• These can be used with vairable substitution as well

  $ A=6
  $ B=3
  $ expr $A + $B
  $ expr $A - $B
  $ expr $A / $B
  $ expr $A \* $B
  

  

Double Parentheses

• Another method for performing arithmetic operations is double parenthesis.

  $ echo $(( A + B ))
  $ echo $(( A-B ))
  $ echo $((A / B))
  $ echo $((A*B))
  

• You may also programming language C stype manipulations of variables

  $ echo $(( ++A ))
  $ echo $(( --A ))
  $ echo $(( A++ ))
  $ echo $(( A-- ))
  

  

bc

• expr and "double parentheses" only return decimal output, they do not support floating values.

• For this we use another utility called bc, it referred to as Basic Calculator.

• It works in an interactive mode and also you can input to another command as well

  $ A=10
  $ B=3
  $ expr $A / $B
  $ echo $((A/B))
  $ echo $A / $B |bc -l