Output +inf, +nan etc. also, so that output can be input. Doc, tests, fixed.

1 files changed, 468 insertions, 452 deletions

diff --git a/doc/gawk.info b/doc/gawk.info
index 29051f64..dc1aa075 100644
--- a/doc/gawk.info
+++ b/doc/gawk.info
@@ -6733,6 +6733,15 @@ width.  Here is a list of the format-control letters:
      versions of 'awk' may print invalid values or do something else
      entirely.  (d.c.)
 
+     NOTE: The IEEE 754 standard for floating-point arithmetic allows
+     for special values that represent "infinity" (positive and
+     negative) and values that are "not a number" (NaN).
+
+     Input and output of these values occurs as text strings.  This is
+     somewhat problematic for the 'awk' language, which predates the
+     IEEE standard.  Further details are provided in *note POSIX
+     Floating Point Problems::; please see there.
+
 
 File: gawk.info,  Node: Format Modifiers,  Next: Printf Examples,  Prev: Control Letters,  Up: Printf
 
@@ -23424,13 +23433,20 @@ and infinity values.  The solution implemented in 'gawk' is as follows:
           $ echo nanny | gawk '{ print $1 + 0 }'
           -| 0
           $ echo +nan | gawk '{ print $1 + 0 }'
-          -| nan
+          -| +nan
           $ echo 0xDeadBeef | gawk '{ print $1 + 0 }'
           -| 0
 
      'gawk' ignores case in the four special values.  Thus, '+nan' and
      '+NaN' are the same.
 
+   Besides handling imput, 'gawk' also needs to print "correct" values
+on output when a value is either NaN or infinity.  Starting with version
+4.2.2, for such values 'gawk' prints one of the four strings just
+described: '+inf', '-inf', '+nan', or '-nan'.  Similarly, in POSIX mode,
+'gawk' prints the result of the system's C 'printf()' function using the
+'%g' format string for the value, whatever that may be.
+
    ---------- Footnotes ----------
 
    (1) You asked for it, you got it.
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+Node: Usenet1199711
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+Node: Old Extension Mechanism1241894
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+Node: Basic Concepts1244839
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+Ref: figure-process-flow1246487
+Ref: Basic High Level-Footnote-11249788
+Node: Basic Data Typing1249973
+Node: Glossary1253301
+Node: Copying1285139
+Node: GNU Free Documentation License1322682
+Node: Index1347802
 
 End Tag Table