#!/bin/sh
# Linux Shell Script Tutorial
# Q4
#

if test $# = 3
then
	case $2 in
	 +) let z=$1+$3;;
	 -) let z=$1-$3;;
	 /) let z=$1/$3;;
	 x|X) let z=$1*$3;;
	 *) echo Warning - $2 invalied operator, only +,-,x,/ operator allowed
	    exit;;
	esac
	echo Answer is $z
else
	echo "Usage - $0   value1  operator value2"
	echo "        Where, value1 and value2 are numeric values"
	echo "               operator can be +,-,/,x (For Multiplication)"
fi