how to check user permissions in c shell script

HI ,

I got a bash script for checking whether the script is run by the user root. If the user is not 'root' then I need to run the script. Now I have to write the same code in c-script using switch statement. Can you please tell me how to write this? Following is the code written in bash.

case `id` in
'uid=0('*)
echo "ERROR: cannot execute as user 'root'"
exit 1
;;
uid=?'(mcidas)'* |\
uid=??'(mcidas)'* |\
uid=???'(mcidas)'* |\
uid=????'(mcidas)'* |\
uid=?????'(mcidas)'* |\
uid=??????'(mcidas)'* |\
uid=???????'(mcidas)'* )
MCDATA=$HOME/workdata
;;
*)
MCDATA=$HOME/mcidas/data
;;
esac


Thanks,
Sridhar.