CREATE OR REPLACE FUNCTION rectangle_area (length IN NUMBER,width IN NUMBER) RETURN NUMBER IS
    area NUMBER;
BEGIN
    area := length * width;
    RETURN area;
END rectangle_area;
/
DECLARE
	length NUMBER := 5;
	width NUMBER := 4;
	area NUMBER;
BEGIN
      area := rectangle_area(length, width);      
      DBMS_OUTPUT.PUT_LINE('Length: ' || length);
      DBMS_OUTPUT.PUT_LINE('Width: ' || width);
      DBMS_OUTPUT.PUT_LINE('Area of the rectangle: ' || area);
  END;
/