Created
April 15, 2018 17:37
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SICP 1.9 My solution
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| (define (+ a b) | |
| (if (= a 0) | |
| b | |
| (inc (+ (dec a) b)))) | |
| (+ 4 5) | |
| (inc (+ (dec 4) 5)) | |
| (inc (+ 3 5)) | |
| (inc (inc (+ 2 5))) | |
| (inc (inc (inc (+ 1 5)))) | |
| (inc (inc (inc (inc (+ 0 5))))) | |
| (inc (inc (inc (inc 5)))) | |
| (inc (inc (inc 6))) | |
| (inc (inc 7)) | |
| (inc 8) | |
| 9 | |
| Recursive | |
| (define (+ a b) | |
| (if (= a 0) | |
| b | |
| (+ (dec a) (inc b)))) | |
| (+ 4 5) | |
| (+ (dec 4) (inc 5)) | |
| (+ 3 6) | |
| (+ 2 7) | |
| (+ 1 8) | |
| (+ 0 9) | |
| 9 | |
| Iterative |
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