sql procedure oracle

1CREATE OR REPLACE PROCEDURE my_schema.my_procedure(param1 IN VARCHAR2) IS
2    cnumber NUMBER;
3BEGIN
4    cnumber := 10;
5    INSERT INTO my_table (num_field) VALUES (param1 + cnumber);
6    COMMIT;
7EXCEPTION
8    WHEN OTHERS THEN
9        raise_application_error(-20001, 'An error was encountered - '
10            || sqlcode || ' -ERROR- ' || sqlerrm);
11END;