Dynamically cursor ?

Hello

[Quoted]            I have a cursor which SQL-statement is as followong

           cursor  is
              select  A
              from   emp
              where emp_no in(XXXXXXXX);

         what I wish is that I can pass a string into XXXXXXX dynamically..
         can I write this?

           cursor  is
              select  A
              from   emp
              where emp_no in &v_string;
          v_string:='('201','202','204');