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Edit history of sicp-ex-4.31

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32014-07-14 00:54:37+4 -1 line(s)[View this version, source] [Diff to previous]
add a clause to test if the cdr is also a pair, to avoid an error when we take the cadr of it. changed eval to actual-value to force arguments.
22013-12-05 13:40:54+1 -1 line(s)[View this version, source] [Diff to current|previous]
typo
12013-12-02 11:43:55+80 -0 line(s)[View this version, source] [Diff to current|previous]
add a solution. felix021
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