Greetings again.
I made a program that tells the size of a dictionary and stores it into a temp.txt file.

temp="temp.txt"

if [ $# -ne 1 ]; then
      echo "Wrong parameter"
 else
      if [ -d "$1" ]; then
             rm "$temp"                        #Delete any previous temp file
             find "./$1" -maxdepth 1 -type f >> "$temp"           
             #save the found files to the temp file

IFS="           #set for breaking characters
"
size=0
files=`cat "$temp"`     #read the temp file
rm "$temp"                 
#delete the temp file (making sure its size wont be read)

#size counting
for i in $files; do
   if [ -f $i ]; then
      size=$(expr $size + $(stat -c%s "$i"))
   fi
done

echo "The directory's size is : $size"
else 
echo "A non directory parameter was given"
fi
fi

My impression is that you are posting homework in the main forums.

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Also, you need to write more descriptive subjects.

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The script deletes temp.txt after creating and reading back reading the file.

This causes temp.txt to be not present the next time the script is run and then this "rm" line will fail:

Actually the "Delete any previous temp file" line is not needed.
Consider replacing ">>" with ">" in the "find" line such that it creates the file if it does not exist or overwrites the file if it does exist.

find "./$1" -maxdepth 1 -type f > "$temp"