create or replace function Show_Binary(i_Number IN Number) Return Varchar2
    AS

    V_Binary varchar2(50) := '';

    Begin
      While i_Number/2>=2 LOOP

        V_Binary := V_Binary + Remainder(i_Number, 2);
        i_Number := i_Number / 2;


    End LOOP;
     V_Binary := V_Binary + i_Number;
     return reverse(V_Binary);
End;

1)expression i_Number can not be used as an assignment target.
2)Identifier 'Reverse' must be declared