Member Avatar for trume

Hello,

How can I do it on a recursive way? (Function ''plus'' needs to call itself)

#!/bin/bash
function plus
{
	let GLOBAL=$GLOBAL+$1
}
GLOBAL=0
n=$1
for ((i=1; i<=n; i++))
do
plus $i
done
echo Answer: $GLOBAL

Any help is welcome!

Regards,
trume

Edited by trume because: /
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  • Latest Post Latest Post by griswolf
Member Avatar for danuz

.

Edited by danuz because: wrong
Member Avatar for trume

Yes, but your code wasn't have correct function. It needs to be as most similar to mine ( SUM ).

Member Avatar for shibblez

Put

set -xv

as your second line. You can now see what is happening as it executes. A clue -

plus $i

doesn't do what you think it does.

Member Avatar for trume

Actaully, I need suggestions about the recursion. How to make function will call itself...

Member Avatar for griswolf

There are many shells. Which one are you using?
The normal meaning for PLUS parameters is" Return the sum of all the parameters", so the recursive way would be to

  • return PLUS (first+second) rest of the parameters
  • Or calculate (i, i+1) for i in the proper range and return PLUS pair-sums

Or something that does part of the work now and defers some of the work to a call of itself.

Edited by griswolf because: n/a
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