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   switch and case and default

       switch(expression)
       {
           case constant1:
                statement();
                break;
           .
           .
           case constantn:
                statement();
                break;

           default:
                statement();
                break;
       }

   Expression  is  evaluated  and compared  against  constant  expression
   values constant1 to constantn.  If a match is found all the statements
   that follow,  upto and including the break, are obeyed. If no match is
   found then the default if present will be obeyed.