While loop sample

DECLARE
VALUE VARCHAR2(8)='RUN';
NUM NUMBER =2;
BEGIN
 WHILE VALUE<>'STOP' LOOP
 IF NUM>5
 THEN VALUE='STOP';
 END IF;
 dbms_output.put_line(VALUE||': ' ||NUM);
 NUM=NUM+1;
 END LOOP;
 
 VALUE='DOWN';
 WHILE NUM>1 AND VALUE='DOWN' LOOP
 dbms_output.put_line(VALUE||': ' ||NUM);
 NUM=NUM-1;
 END LOOP;
 
 WHILE 7=4 LOOP
 NULL;
 END LOOP;
END;