oracle for loop

1DECLARE
2    i NUMBER;
3BEGIN
4    FOR i IN 1..5
5        LOOP
6            dbms_output.PUT_LINE('i value : ' || i);
7        END LOOP;
8END;

1DECLARE
2    count number(2) := 10;
3BEGIN
4    FOR count in 10..20                         (FOR count in REVERSE 10..20)
5    LOOP
6        dbms_output.put_line("COUNT : " || count);
7    END LOOP;
8END;
9
10-- FOR count in 10..20 
11-- it will print value from 10 to 20
12-- FOR count in REVERSE 10..20 
13-- it will print value from 20 to 10

1FOR contatore IN lower bound..upper bound
2LOOP 
3	...
4END LOOP;

1-- FOR LOOP --------------
2  FOR loop_counter IN [REVERSE] lowest_number..highest_number
3  LOOP
4     {...statements...}
5  END LOOP;
6  
7-- FOR LOOP (MODERN) --------------
8  FOR record_index in cursor_name
9  LOOP
10  {...statements...}
11  END LOOP;
12  
13-- CURSOR LOOP (OLD STYLE) --------------
14	OPEN c_customers; 
15    LOOP 
16    	FETCH c_customers into c_rowtype_var; 
17    	EXIT WHEN c_customers%notfound; 
18    	{...statements...}; 
19    END LOOP;