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Marius Vollmer 2002-05-07 18:11:05 +00:00
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25
NEWS
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@ -20,6 +20,31 @@ debugging evaluator gives better error messages.
* Changes to Scheme functions and syntax
** There is support for Infinity and NaNs.
Following PLT Scheme, Guile can now work with infinite numbers, and
'not-a-numbers'.
There is new syntax for numbers: "+inf.0" (infinity), "-inf.0"
(negative infinity), "+nan.0" (not-a-number), and "-nan.0" (same as
"+nan.0"). These numbers are inexact and have no exact counterpart.
Dividing by an inexact zero returns +inf.0 or -inf.0, depending on the
sign of the dividend. The infinities are integers, and they answer #t
for both 'even?' and 'odd?'. The +nan.0 value is not an integer and is
not '=' to itself, but '+nan.0' is 'eqv?' to itself.
For example
(/ 1 0.0)
=> +inf.0
(/ 0 0.0)
=> +nan.0
(/ 0)
ERROR: Numerical overflow
** We now have uninterned symbols.
The new function 'make-symbol' will return a uninterned symbol. This

5
test-suite/ChangeLog
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@ -1,3 +1,8 @@
2002-05-07 Marius Vollmer <mvo@zagadka.ping.de>
* tests/numbers.test (/): Expect divison by an inexact zero to
yield +inf.0.
2002-05-06 Marius Vollmer <mvo@zagadka.ping.de>
* tests/regexp.test (regexp-substitute/global): Do not test with