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   while

       while(expression)
          statement();

       while(expression)
       {
         statement1();
         .
         .
         statementn();
       }

   The  program  statement(s)  are  executed as  long  as  the  value  of
   expression is NONE-ZERO. Because the evaluation takes place before the
   execution of the statement(s), they may NEVER be executed.