Created
December 23, 2011 03:54
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Factorial in lisp recursive process
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| (defun fact(n) | |
| (if (<= n 1) | |
| 1 | |
| (* n (fact (- n 1))))) | |
| SICP3> (fact 10) | |
| 0: (FACT 10) | |
| 1: (FACT 9) | |
| 2: (FACT 8) | |
| 3: (FACT 7) | |
| 4: (FACT 6) | |
| 5: (FACT 5) | |
| 6: (FACT 4) | |
| 7: (FACT 3) | |
| 8: (FACT 2) | |
| 9: (FACT 1) | |
| 9: FACT returned 1 | |
| 8: FACT returned 2 | |
| 7: FACT returned 6 | |
| 6: FACT returned 24 | |
| 5: FACT returned 120 | |
| 4: FACT returned 720 | |
| 3: FACT returned 5040 | |
| 2: FACT returned 40320 | |
| 1: FACT returned 362880 | |
| 0: FACT returned 3628800 |
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