#!/bin/bash
#### Mean average.

average()
{
	if [ $2 -eq 0 ]
	then
		echo "ERROR:  0/0 is undefined!"; exit 1
	fi
	let result=$1/$2
	echo $result
}


total=0
count=0

echo "#### Mean average ####"
echo "(Enter positve numbers; zero to stop.)"
echo -n "First number:	"
read n

while [ $n -gt 0 ]
do
	let count=count+1
	let total=$total+$n
	echo "Total:	$total"

	echo -n "Next number:	"
	read n
done

echo -n "Mean average:	"
average $total $count

echo "# Thank you for using my mean script. #"
exit 0