Help needed in passing arguments from command line in bash

#function myfunc
myfunc(){
echo $1
case $1 in
    e)
            a=5
            ;;
    q)
            a=10
            ;;
esac
}
myfunc

I need help in following :

$myfunc.sh e

echo $1 is not showing anything. case is also not working. What am I doing wrong?