I am not able to call a stored function in database

Question

Hi,
i have created a function and when i call it every time i faced error. what is the reasone plz help me. the whole script is as under:
SQLWKS> create or replace function get_months ( v_year in number) return number
2> is
3> v_months number;
4> begin
5> v_months := v_year * 12;
6> return v_months;
7> end get_months;
Statement processed.
SQLWKS> execute get_months (10);
get_months (10);
ORA-06550: line 2, column 2:
PLS-00221: 'GET_MONTHS' is not a procedure or is undefined
ORA-06550: line 2, column 2:
PL/SQL: Statement ignored
plz suggest me, because it is a simple function.

Answer 1

I ask because the Oracle 10g SQL Reference says that execute
can be used for either function and procedures.The SQL Reference manual says that? Where? Do you mean the SQL Plus manual?
Anyway, you can. Like this:
SQL> create or replace
  2  function get_months ( v_year in number) return number is
  3  begin
  4     return v_year * 12;
  5  end get_months;
  6  /
Function created.
SQL> var vmonths number
SQL> exec :vmonths := get_months(10);
PL/SQL procedure successfully completed.
SQL> print vmonths
             VMONTHS
                 120