#!/bin/bash

yesno=Y

while [ "$yesno" = "y" ] || [ "$yesno" = "Y" ]
do
 
clear
counter=1

echo -n "please enter the first element : "
read first
 
echo -n "please enter the number of elements : "
read number

echo -n "please enter R or D : "
read rd

echo -n "please enter AP or GP : "
read apgp

result=$first

echo $result

while [ "$counter" -le "$number" ] 
do
     	echo " result value is "$result" for element "$counter" "
	
	let counter+=1 

	if [ "$apgp" = "AP" ] || [ "$apgp" = "ap" ] || [ "$apgp" = "Ap" ] || [ "$apgp" = "aP" ]; then

		let result=result+rd

	elif [ "$apgp" = "GP" ] || [ "$apgp" = "gp" ] || [ "$apgp" = "Gp" ] || [ "$apgp" = "gP" ]; then

		let result=result*rd
	else 

		echo " bad progression must be AP or GP "
		let counter=number+1
	fi

	
     
done

sleep 3


echo

echo

echo -n "Do you want to play again Y/N  "
read yesno

done

echo "Thank you"