Homework & Coursework Questions

I've made a script using the code above. When I got the variables DIR and OUT declared in the code by the full path, everything works alright, but when I want declare them by the parameters the script doesn't work . Would be anybody so kind and show me how to write the script to be able to declare variables DIR and OUT from parameters?

#!/bin/bash

DIR=/home/martin/java
OUT=/home/martin/abcd

A=`cd "$DIR" && ls| find -d | xargs cat | tr "\ " "\n"| uniq -u | wc -l`
B=`cd "$DIR" && ls| find -d | wc -l`
DIVISION=$(($A/$B))

if [ "$(ls $OUT | wc -l)" == '0' ]
then
echo $DIVISION>$OUT/pocet1
else
{
a=`ls $OUT | sort -n | tail -n1`
numToIncr=${a#${a%?}}
numToIncr=$(($numToIncr+1))
outDir=pocet$numToIncr
echo $DIVISION>$OUT/$outDir
}
fi

DIR="$1" and OUT="$2" perhaps?

The code showing error and basically strange one to compete.