shell script in android gives [: not found

Question

I have this script which works on my linux machine

#!/bin/sh
c=1
if [ $c == 1 ]
then
  echo c is 1
else
  echo c is 0
fi

But when I use this in

Answer 1

How about checking that the .sh file doesn't contain a carriage return before line feed.

Windows \r\n -> CR LF

Unix \n -> LF