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fix more r6rs expt problems on 0 or 0.0 base

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svn: r11371
This commit is contained in:
Matthew Flatt 2008-08-21 19:50:28 +00:00
parent c170f390a7
commit 6c89ae4f09
1 changed files with 20 additions and 6 deletions
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22
collects/rnrs/base-6.ss
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@ -302,12 +302,26 @@
[(n m) (/ (log n) (log m))]))
(define (r6rs:expt base power)
(if (and (or (eq? base 0)
(eq? base 1))
(cond
[(and (number? base)
(zero? base)
(number? power))
(if (zero? power)
(if (and (eq? base 0)
(exact? power))
1
1.0)
(if (positive? (real-part power))
(if (and (eq? base 0)
(exact? power))
0
0.0)
(expt base power)))]
[(and (eq? base 1)
(number? power)
(inexact? power))
(expt (exact->inexact base) power)
(expt base power)))
(expt (exact->inexact base) power)]
[else (expt base power)]))
(define (r6rs:angle n)
; because `angle' produces exact 0 for reals: