#
# Accept number and check the number is even or odd, finds the length of the number, sum of the digits    
# in the number. 
#
clear
echo -n "Enter any number :"
read number
 
echo "===== Available choices ====="
echo "1. Odd or even"
echo "2. Find length of number"
echo "3. Sum of digits of number"
echo "E. Exit"
echo "============================="
 
echo -n "\nEnter your choice:"
read choice
 
while [ $choice != 'E' -o $choice != 'e' ]
do
    case $choice in
	1)
		if [ `expr $number % 2` -eq 0 ]
		then
			echo "Number is even"
		else
			echo "Number is odd"
		fi
	;;
	2)
		length=$((`echo $number | wc -c` - 1))
		echo "Length of number is "$length
	;;
	3)
		tempnumber=$number
		sum=0
		while [ $tempnumber -gt 0 ]
		do
			digit=`expr $tempnumber % 10`
			sum=`expr $sum + $digit`
			tempnumber=`expr $tempnumber / 10`
		done
		echo "Sum of digit of a number is "$sum
 
	;;
	[eE])
		exit;
	;;
	*)
		echo "Invalid choice"
	;;
	esac
	read temp #for pause
	clear
	echo "Number you entred : "$number"\n"
	echo "===== Available choices ====="
	echo "1. Odd or even"
	echo "2. Find length of number"
	echo "3. Sum of digits of number"
	echo "E. Exit"
	echo "============================="
 
	echo -n "\nEnter your choice:"
	read choice
done