Write example for loop? in oracle

Example 1: for loop in oracle

DECLARE
    count number(2) := 10;
BEGIN
    FOR count in 10..20                         (FOR count in REVERSE 10..20)
    LOOP
        dbms_output.put_line("COUNT : " || count);
    END LOOP;
END;

-- FOR count in 10..20 
-- it will print value from 10 to 20
-- FOR count in REVERSE 10..20 
-- it will print value from 20 to 10

Example 2: for loop oracle

-- FOR LOOP --------------
  FOR loop_counter IN [REVERSE] lowest_number..highest_number
  LOOP
     {...statements...}
  END LOOP;
  
-- FOR LOOP (MODERN) --------------
  FOR record_index in cursor_name
  LOOP
  {...statements...}
  END LOOP;
  
-- CURSOR LOOP (OLD STYLE) --------------
	OPEN c_customers; 
    LOOP 
    	FETCH c_customers into c_rowtype_var; 
    	EXIT WHEN c_customers%notfound; 
    	{...statements...}; 
    END LOOP;