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1bafa2271c
* Replace mapcar by apply * Add map and reduce to core lib * Add pi.lsp example * Fix tests * Refactor pi-digits * Move builtin join to core lib as string-join * Rename decode-* and encode-* to *-decode and *-encode * Update doc
17 lines
330 B
Common Lisp
17 lines
330 B
Common Lisp
(load "/lib/lisp/core.lsp")
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(defn pi-nth (n)
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(* (^ 16 (- n)) (-
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(/ 4 (+ 1 (* 8 n)))
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(/ 2 (+ 4 (* 8 n)))
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(/ 1 (+ 5 (* 8 n)))
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(/ 1 (+ 6 (* 8 n))))))
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(defn pi-digits (n)
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(apply + (map pi-nth (range 0 n))))
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(println
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(cond
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((null? args) "Usage: pi <precision>")
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(true (pi-digits (parse (car args))))))
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