Area & Circumference of a circle - Shell script for Mac OS X

Guys in todays post let us look into a simple basic Mathematics problem. Let us automate the calculation of area and circumference of a circle, using a simple bash script. It's an easy script useful for learning some basic shell scripting.

Note : Value of pi used is a constant value rounded off to 3.142

#!/bin/bash

#program to calculate area and circumference of a circle

echo "=========================================="

echo "Area & Circumference of Circle Calculator"

echo "=========================================="

pi=3.142

echo "Please enter the radius of the circle : "

read radius

circumference=`expr "2*$pi*$radius"|bc`

echo "Circumference of circle : $circumference"

area=`expr "$pi*$radius*$radius"|bc`

echo "Area of circle : $area"

Output :

./AreaOfCircle.sh

==========================================

Area & Circumference of Circle Calculator

==========================================

Please enter the radius of the circle : 

5

Circumference of circle : 31.420

Area of circle : 78.550

Also do check out my previous post on Simple Interest Tool for additional scripting reference.