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  1. (define (accumulate a b combiner null-value term next)
  2. 	(if (> a b)
  3. 		null-value
  4. 		(combiner (term a)
  5. 			  (accumulate (next a) b combiner null-value term next))))
  6.  
  7. (define (accumulate-iter a b combiner null-value term next)
  8. 		(define (iter a result)
  9. 			(if (> a b)
  10. 				result
  11. 				(iter (next a) (combiner result
  12. 							 (term a)))))
  13. 		(iter a null-value))
  14.  
  15. (define (sum a b term next)
  16. 	(accumulate a b + 0 term next))
  17.  
  18. (define (product a b term next)
  19. 	(accumulate a b * 1 term next))
  20.  
  21. (define (sum-iter a b term next)
  22. 	(accumulate-iter a b + 0 term next))
  23.  
  24. (define (product-iter a b term next)
  25. 	(accumulate-iter a b * 1 term next))
  26.  
  27. (define (identity n) n)
  28.  
  29. (define (inc n) (+ n 1))
  30.  
  31.  
  32.  
  33. (display (sum 1 10 identity inc))
  34. (newline)
  35. (display (sum-iter 1 10 identity inc))
  36. (newline)
  37.  
  38. (display (product 1 10 identity inc))
  39. (newline)
  40. (display (product-iter 1 10 identity inc))
  41. (newline)
Success #stdin #stdout 0.03s 8656KB
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https://ideone.com/WUgQli
language:
Scheme (guile 2.2.4)
created:
8 years ago
visibility:
public

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