Bash + Recursive Method

SuchANewb · 11-04-2010, 08:19 AM

I have made a program which reads the input number and then sums it up. Example: If you write 5 then the program will sum up -> 1+2+3+4+5=15

But apparently I need to solve this program so it will solve this mathematical problem recursively and the function summ should call itself.

Any suggestions?

Code:

#!/bin/bash
GLOBAL=$1
SUM=0
COUNTER=1

function summ {

if [ -z $GLOBAL ] ; then
	echo "Insert number!"
	exit 1
fi

while [ $SUM -le $GLOBAL ]; do
	let SUM=SUM+COUNTER
	let COUNTER=COUNTER+1
done
echo $SUM
}

summ

alli_yas · 11-04-2010, 08:51 AM

Hi

This sounds like home work; but anyway:

Read this which explains the technique of bash recursion and calling a function within itself.

Also what would make the solution even better is this - which is a mathematical formula that adds numbers from 1..n