Execute this pl/sql function with some proper example & syntax

Question

--program is compiled but how to run this function with some proper example please please help me
CREATE OR REPLACE
FUNCTION EMP_GENDER(
EMP_GEN CHAR)
RETURN CHAR
IS
CUST_GEN CHAR(1) ;
DTECH1 EXCEPTION;
BEGIN
CUST_GEN :=UPPER(EMP_GEN);
IF CUST_GEN !='M' OR CUST_GEN != 'F' THEN
RAISE DTECH1;
ELSE
RETURN CUST_GEN;
END IF;
EXCEPTION
WHEN DTECH1 THEN
DBMS_OUTPUT.PUT_LINE('INVALID GEN');
WHEN OTHERS THEN
DBMS_OUTPUT.PUT_LINE(SQLERRM);
END;

Answer 1

Or in pl/sql;-
declare
            v_gender char(1) default 'M';--change M to whatever test scenario
begin
            v_gender:= emp_gender(v_gender);
            dbms_output.put_line(v_gender);
end;And remember to set your serveroutput on.... though your errors will be obvious enough...