Why getting error in bash for loop?

Question

I am trying to run the below code using for loop but i am getting syntax error. Please help.

Input Format: The first line of the input contains an i

Answer 1

The printf "%s" "$n" | hexdump -C shows that the CR is contained in the input rather than in the script file, so running dos2unix on the script won't help anyway. A simple means to get rid of it is setting IFS=$'\r'.
Then, read val in a loop is unfit to read space-separated integers, since read reads a whole line at a time. But for the task of bitwise exclusive ORing those N space-separated integers we don't need an explicit loop - we can just replace all spaces with the desired operator and evaluate the result.

#!/bin/bash
IFS=$'\r'
read n
read a
((sum = ${a// /^}))
echo $sum