calculator in bash

script7.sh

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+#!/bin/bash
+
+##This script illustrates how to make a calculator using bash
+
+clear
+
+sum=0
+i="y"
+
+echo "Enter first no: "
+read n1
+echo "Enter second no: "
+read n2
+
+while [ $i = "y" ]
+do
+echo "1. Addition"
+echo "2. Subtraction"
+echo "3. Multiplication"
+echo "4. Division"
+read op
+
+case $op in
+	1) sum= expr $n1 + $n2
+	echo "sum = "$sum;;
+ 	2) sum= expr $n1 - $n2
+	echo "Sub = "$sum;;
+	3) sum= expr $n1 \* $n2
+	echo "Mult = "$sum;;
+	4) sum= expr $n1 / $n2
+	echo "Div = "$sum;;
+	*)echo "Invalid choice";;
+
+esac
+
+echo "Do you want to continue (Y/n))? "
+read i
+if [ $i != "y" ]
+then
+	exit
+fi
+done