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December 28, 2019 08:06
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quick and dirty "x ^ y" power function in scheme to raise a base to an exponent
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| (define (myabs x) | |
| (cond ((< x 0) (* x -1)) | |
| ((x >= 0) (* x 1)))) | |
| (define (myexpt x y) | |
| (cond ((< x 0) (* (cond ((odd? (myabs y)) -1) | |
| (else 1)) | |
| (myexpt (myabs x) y))) | |
| ((< y 0) (/ 1 (myexpt x (myabs y)))) | |
| ((= y 0) 1) | |
| ((> y 0) (* x (myexpt x (- y 1)))))) |
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tested in kawa and sisc