Case ... in, file type cases

I was given homework where I need to test if $1 is a file, special file or a folder in a **Case $1 In statement**. I tried some things but wasn't able to make it work. Do you have any idea on how to implement this (in a case statement) What I need to achieve is : if [ -f $1 ] then exit 1 elif [ -d $1 ] then exit 2 elif [ -c $1 -o -b $1 ] then exit 3 else exit 0 fi I'm not asking for the final code, just a way to make the following work: Case $1 in -d) ...