Oracle > Exception Handling

CREATE OR REPLACE PROCEDURE myproc IS

BEGIN
  NULL;
  /*IF MOD(inval, 2) = 1 THEN
    RAISE oddno;
  ELSE
    RAISE evenno;
  END IF;*/ 
EXCEPTION
  WHEN NO_DATA_FOUND THEN
    NULL; 
  WHEN ZERO_DIVIDE THEN
    emesg := SQLERRM;
    dbms_output.put_line(emesg);
  WHEN OTHERS THEN
    ecode := SQLCODE;
    dbms_output.put_line(thisproc || ' - ' || ecode);
  WHEN too_long THEN
    dbms_output.put_line('More Than 11 Characters');
    RETURN 'FALSE';
  WHEN too_short THEN
    dbms_output.put_line('Less Than 11 Characters');
    RETURN 'FALSE';
  WHEN delimiter THEN
    dbms_output.put_line('Incorrect Delimiter');
    RETURN 'FALSE';
  WHEN OTHERS THEN
    dbms_output.put_line('Some Other Issue');
    RETURN 'FALSE';
  WHEN evenno THEN
    dbms_output.put_line(TO_CHAR(inval) || ' is even');
  WHEN oddno THEN
    dbms_output.put_line(TO_CHAR(inval) || ' is odd');
END;