6.1 The LOOP Facility   6.1.2 Variable Initialization and Stepping Clauses   6.1.2.1 Iteration Control   6.1.2.1.1 The for-as-arithmetic subclause

6.1.2.1.1.1 Examples of for-as-arithmetic subclause

;; Print some numbers.
 (loop for i from 1 to 3
       do (print i))
1
2
3
  NIL
 
;; Print every third number.
 (loop for i from 10 downto 1 by 3
       do (print i))
10 
7 
4 
1 
  NIL
 
;; Step incrementally from the default starting value.
 (loop for i below 3
       do (print i))
0
1
2
  NIL