some solutions for MIT Press's "structure and interpretation of computer programs", I guess
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(define (double x) |
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(+ x x)) |
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(define (halve x) |
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(/ x 2)) |
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(define (nice-mult a b) |
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(cond ((zero? b) 0) |
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((even? b) (double (nice-mult a (halve b)))) |
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(else (+ a (nice-mult a (- b 1)))))) |
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(display (nice-mult 3 3)) |
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(newline)
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