- marked as enhancement
Implement 'positive?' and 'negative?' in Scheme
Issue #58
new
positive? should return #t if real is greater than zero, #f otherwise.
negative? should return #t if real is less than zero, #f otherwise.
( http://www.scheme.com/tspl4/objects.html#./objects:s94 )
(positive? 128)
Traceback (most recent call last):
File "stdin", line 1, col 2
RunTimeError: unbound variable 'positive?'
(negative? -65)
Traceback (most recent call last):
File "stdin", line 1, col 2
RunTimeError: unbound variable 'negative?'
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