[LarzI]

Here's how you would do it:

pawn Код:

CMD:clan(playerid, params[])
{
    new id, level, subcmd[9];
    if(sscanf(params, "s[9]ud", subcmd, id, level)) 
        return SendClientMessage(playerid, Red, "/Clan SetLevel [id] [level]");
    if( strcmp( subcmd, "setlevel", true ))
        return SendClientMessage(playerid, Red, "/Clan SetLevel [id] [level]");

    SendClientMessage(playerid, Red, "Work !");
    return true;
}

sscanf checks it any params aren't included, so no need for the isnull check.