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-rw-r--r--doc/gawk.texi452
1 files changed, 392 insertions, 60 deletions
diff --git a/doc/gawk.texi b/doc/gawk.texi
index c3ec64e5..84612764 100644
--- a/doc/gawk.texi
+++ b/doc/gawk.texi
@@ -754,6 +754,8 @@ particular records in a file and perform operations upon them.
* Arrays Summary:: Summary of arrays.
* Built-in:: Summarizes the built-in functions.
* Calling Built-in:: How to call built-in functions.
+* Boolean Functions:: A function that returns Boolean
+ values.
* Numeric Functions:: Functions that work with numbers,
including @code{int()}, @code{sin()}
and @code{rand()}.
@@ -863,6 +865,7 @@ particular records in a file and perform operations upon them.
* Programs Summary:: Summary of programs.
* Programs Exercises:: Exercises.
* Nondecimal Data:: Allowing nondecimal input data.
+* Boolean Typed Values:: Values with @code{number|bool} type.
* Array Sorting:: Facilities for controlling array
traversal and sorting arrays.
* Controlling Array Traversal:: How to use PROCINFO["sorted_in"].
@@ -926,6 +929,7 @@ particular records in a file and perform operations upon them.
* Inexact representation:: Numbers are not exactly represented.
* Comparing FP Values:: How to compare floating point values.
* Errors accumulate:: Errors get bigger as they go.
+* Strange values:: A few words about infinities and NaNs.
* Getting Accuracy:: Getting more accuracy takes some work.
* Try To Round:: Add digits and round.
* Setting precision:: How to set the precision.
@@ -3144,11 +3148,12 @@ column means that the person is a friend.
An @samp{R} means that the person is a relative:
@example
-@c system if test ! -d eg ; then mkdir eg ; fi
-@c system if test ! -d eg/lib ; then mkdir eg/lib ; fi
-@c system if test ! -d eg/data ; then mkdir eg/data ; fi
-@c system if test ! -d eg/prog ; then mkdir eg/prog ; fi
-@c system if test ! -d eg/misc ; then mkdir eg/misc ; fi
+@c system if test ! -d eg ; then mkdir eg ; fi
+@c system if test ! -d eg/lib ; then mkdir eg/lib ; fi
+@c system if test ! -d eg/data ; then mkdir eg/data ; fi
+@c system if test ! -d eg/prog ; then mkdir eg/prog ; fi
+@c system if test ! -d eg/misc ; then mkdir eg/misc ; fi
+@c system if test ! -d eg/test-programs ; then mkdir eg/test-programs ; fi
@c file eg/data/mail-list
Amelia 555-5553 amelia.zodiacusque@@gmail.com F
Anthony 555-3412 anthony.asserturo@@hotmail.com A
@@ -4848,7 +4853,10 @@ blocksize, which is usually the filesystem's I/O blocksize.)
If this variable exists with a value of @samp{gst}, @command{gawk}
switches to using the hash function from GNU Smalltalk for
managing arrays.
-This function may be marginally faster than the standard function.
+With a value of @samp{fnv1a}, @command{gawk} uses the
+@uref{http://www.isthe.com/chongo/tech/comp/fnv/index.html,
+FNV1-A hash function}.
+These functions may be marginally faster than the standard function.
@item AWKREADFUNC
If this variable exists, @command{gawk} switches to reading source
@@ -10203,7 +10211,7 @@ infinity are formatted as
and positive infinity as
@samp{inf} or @samp{infinity}.
The special ``not a number'' value formats as @samp{-nan} or @samp{nan}
-(@pxref{Math Definitions}).
+(@pxref{Strange values}).
@item @code{%F}
Like @samp{%f}, but the infinity and ``not a number'' values are spelled
@@ -18306,6 +18314,7 @@ but are summarized here for your convenience.
@menu
* Calling Built-in:: How to call built-in functions.
+* Boolean Functions:: A function that returns Boolean values.
* Numeric Functions:: Functions that work with numbers, including
@code{int()}, @code{sin()} and @code{rand()}.
* String Functions:: Functions for string manipulation, such as
@@ -18375,6 +18384,25 @@ and 12. But if the order of evaluation is right to left, @code{i}
first becomes 10, then 11, and @code{atan2()} is called with the
two arguments 11 and 10.
+
+@node Boolean Functions
+@subsection Generating Boolean Values
+@cindex boolean function
+
+This function is specific to @command{gawk}. It is not
+available in compatibility mode (@pxref{Options}):
+
+@c @asis for docbook
+@table @asis
+@item @code{mkbool(@var{expression})}
+@cindexgawkfunc{mkbool}
+Return a Boolean-typed value based on the regular Boolean value
+of @var{expression}. Boolean ``true'' values have numeric value one.
+Boolean ``false'' values have numeric
+zero. This is discussed in more
+detail in @ref{Boolean Typed Values}.
+@end table
+
@node Numeric Functions
@subsection Numeric Functions
@cindex numeric @subentry functions
@@ -18439,7 +18467,7 @@ compatibility mode (@pxref{Options}).
@cindexawkfunc{log}
@cindex logarithm
Return the natural logarithm of @var{x}, if @var{x} is positive;
-otherwise, return @code{NaN} (``not a number'') on IEEE 754 systems.
+otherwise, return NaN (``not a number'') on IEEE 754 systems.
Additionally, @command{gawk} prints a warning message when @code{x}
is negative.
@@ -20900,6 +20928,9 @@ Return one of the following strings, depending upon the type of @var{x}:
@item "number"
@var{x} is a number.
+@item "number|bool"
+@var{x} is a Boolean typed value (@pxref{Boolean Typed Values}).
+
@item "string"
@var{x} is a string.
@@ -21778,7 +21809,7 @@ being aware of them.
@cindex pointers to functions
@cindex differences in @command{awk} and @command{gawk} @subentry indirect function calls
-This section describes an advanced, @command{gawk}-specific extension.
+This @value{SECTION} describes an advanced, @command{gawk}-specific extension.
Often, you may wish to defer the choice of function to call until runtime.
For example, you may have different kinds of records, each of which
@@ -29429,6 +29460,7 @@ discusses the ability to dynamically add new built-in functions to
@menu
* Nondecimal Data:: Allowing nondecimal input data.
+* Boolean Typed Values:: Values with @code{number|bool} type.
* Array Sorting:: Facilities for controlling array traversal and
sorting arrays.
* Two-way I/O:: Two-way communications with another process.
@@ -29495,6 +29527,49 @@ leads to less surprising results.
This option may disappear in a future version of @command{gawk}.
@end quotation
+@node Boolean Typed Values
+@section Boolean Typed Values
+
+Scalar values in @command{awk} are either numbers or strings.
+@command{gawk} also supports values of type @code{regexp}
+(@pxref{Strong Regexp Constants}).
+
+As described in @ref{Truth Values}, Boolean values in @command{awk}
+don't have a separate type: a value counts as ``true'' if it is nonzero
+or non-null, and as ``false'' otherwise.
+
+When interchanging data with languages that do have a real Boolean type,
+using a standard format such as JSON or XML, the lack of a true Boolean
+type in @command{awk} is problematic.
+(See, for example, the @code{json} extension provided by
+@uref{https://sourceforge.net/projects/gawkextlib, the @code{gawkextlib} project}.)
+
+It's easy to import Boolean data into @command{awk}, but then the fact
+that it was originally Boolean is lost. Exporting data is even harder;
+there's no way to indicate that a value is really Boolean.
+
+To solve this problem, @command{gawk} provides a function named @code{mkbool()}.
+It takes one argument, which is any @command{awk} expression, and it
+returns a value of Boolean type.
+
+The returned values are normal @command{awk} numeric values, with
+values of either one or zero,
+depending upon the truth
+value of the original expression passed in the call to @code{mkbool()}.
+
+The @code{typeof()} function (@pxref{Type Functions}) returns
+@code{"number|bool"} for these values.
+
+Thus Boolean-typed values @emph{are} numbers as far as @command{gawk}
+is concerned, except that extension code can treat them as Booleans
+if desired.
+
+While it would have been possible to add two new built-in variables
+of Boolean type named @code{TRUE} and @code{FALSE}, doing so would
+undoubtedly have broken many existing @command{awk} programs. Instead,
+having a ``generator'' function that creates Boolean values gives
+flexibility, without breaking as much existing code.
+
@node Array Sorting
@section Controlling Array Traversal and Array Sorting
@@ -33849,21 +33924,9 @@ A special value representing infinity. Operations involving another
number and infinity produce infinity.
@item NaN
-``Not a number.''@footnote{Thanks to Michael Brennan for this description,
-which we have paraphrased, and for the examples.} A special value that
-results from attempting a calculation that has no answer as a real number.
-In such a case, programs can either receive a floating-point exception,
-or get @code{NaN} back as the result. The IEEE 754 standard recommends
-that systems return @code{NaN}. Some examples:
-
-@table @code
-@item sqrt(-1)
-This makes sense in the range of complex numbers, but not in the
-range of real numbers, so the result is @code{NaN}.
-
-@item log(-8)
-@minus{}8 is out of the domain of @code{log()}, so the result is @code{NaN}.
-@end table
+``Not a number.'' A special value that results from attempting a
+calculation that has no answer as a real number. @xref{Strange values},
+for more information about infinity and not-a-number values.
@item Normalized
How the significand (see later in this list) is usually stored. The
@@ -34032,6 +34095,7 @@ decimal places in the final result.
* Inexact representation:: Numbers are not exactly represented.
* Comparing FP Values:: How to compare floating point values.
* Errors accumulate:: Errors get bigger as they go.
+* Strange values:: A few words about infinities and NaNs.
@end menu
@node Inexact representation
@@ -34153,6 +34217,242 @@ $ @kbd{gawk 'BEGIN @{}
@print{} 4
@end example
+@node Strange values
+@subsubsection Floating Point Values They Didn't Talk About In School
+
+Both IEEE 754 floating-point hardware, and MPFR, support two kinds of
+values that you probably didn't learn about in school. The first is
+@dfn{infinity}, a special value, that can be either negative or positive,
+and which is either smaller than any other value (negative infinity),
+or larger than any other value (positive infinity). When such values
+are generated, @command{gawk} prints them as either @samp{-inf} or
+@samp{+inf}, respectively. It accepts those strings as data input and
+converts them to the proper floating-point values internally.
+
+Infinity values of the same sign compare as equal to each other.
+Otherwise, operations (addition, subtraction, etc.) involving another
+number and infinity produce mathematically reasonable results.
+
+The second kind of value is ``not a number'', or NaN for
+short.@footnote{Thanks to Michael Brennan for this description, which we
+have paraphrased, and for the examples.} This is a special value that results
+from attempting a calculation that has no answer as a real number.
+In such a case, programs can either receive a floating-point exception,
+or get NaN back as the result. The IEEE 754 standard recommends
+that systems return NaN. Some examples:
+
+@table @code
+@item sqrt(-1)
+@iftex
+The @math{\sqrt{-1}}
+@end iftex
+@ifnottex
+This
+@end ifnottex
+makes sense in the range of complex numbers, but not in the
+range of real numbers, so the result is NaN.
+
+@item log(-8)
+@minus{}8 is out of the domain of @code{log()}, so the result is NaN.
+@end table
+
+NaN values are strange. In particular, they cannot be compared with other
+floating point values; any such comparison, except for ``is not equal
+to'', returns false. NaN values are so much unequal to other values that
+even comparing two identical NaN values with @code{!=} returns true!
+
+NaN values can also be signed, although it depends upon the implementation
+as to which sign you get for any operation that returns a NaN. For
+example, on some systems, @code{sqrt(-1)} returns a negative NaN. On
+others, it returns a positive NaN.
+
+When such values are generated, @command{gawk} prints them as either
+@samp{-nan} or @samp{+nan}, respectively. Here too, @command{gawk}
+accepts those strings as data input and converts them to the proper
+floating-point values internally.
+
+If you want to dive more deeply into this topic, you can find
+test programs in C, @command{awk} and Python in the directory
+@file{awklib/eg/test-programs} in the @command{gawk} distribution.
+These programs enable comparison among programming languages as to how
+they handle NaN and infinity values.
+
+@ignore
+@c file eg/test-programs/gen-float-table.awk
+function eq(left, right)
+@{
+ return left == right
+@}
+
+function ne(left, right)
+@{
+ return left != right
+@}
+
+function lt(left, right)
+@{
+ return left < right
+@}
+
+function le(left, right)
+@{
+ return left <= right
+@}
+
+function gt(left, right)
+@{
+ return left > right
+@}
+
+function ge(left, right)
+@{
+ return left >= right
+@}
+
+BEGIN @{
+ nan = sqrt(-1)
+ inf = -log(0)
+ split("== != < <= > >=", names)
+ names[3] = names[3] " "
+ names[5] = names[5] " "
+ split("eq ne lt le gt ge", funcs)
+
+ compare[1] = 2.0
+ compare[2] = values[1] = -sqrt(-1.0) # nan
+ compare[3] = values[2] = sqrt(-1.0) # -nan
+ compare[4] = values[3] = -log(0.0) # inf
+ compare[5] = values[4] = log(0.0) # -inf
+
+ for (i = 1; i in values; i++) @{
+ for (j = 1; j in compare; j++) @{
+ for (k = 1; k in names; k++) @{
+ the_func = funcs[k]
+ printf("%g %s %g -> %s\n",
+ values[i],
+ names[k],
+ compare[j],
+ @@the_func(values[i], compare[j]) ?
+ "True" : "False");
+ @}
+ printf("\n");
+ @}
+ @}
+@}
+@c endfile
+@end ignore
+
+@ignore
+@c file eg/test-programs/gen-float-table.c
+#include <stdio.h>
+#include <math.h>
+#include <stdbool.h>
+
+#define def_func(name, op) \
+ bool name(double left, double right) @{ \
+ return left op right; \
+ @}
+
+def_func(eq, ==)
+def_func(ne, !=)
+def_func(lt, <)
+def_func(le, <=)
+def_func(gt, >)
+def_func(ge, >=)
+
+struct @{
+ const char *name;
+ bool (*func)(double left, double right);
+@} functions[] = @{
+ @{ "==", eq @},
+ @{ "!=", ne @},
+ @{ "< ", lt @},
+ @{ "<=", le @},
+ @{ "> ", gt @},
+ @{ ">=", ge @},
+ @{ 0, 0 @}
+@};
+
+int main()
+@{
+ double values[] = @{
+ -sqrt(-1), // nan
+ sqrt(-1), // -nan
+ -log(0.0), // inf
+ log(0.0) // -inf
+ @};
+ double compare[] = @{ 2.0,
+ -sqrt(-1), // nan
+ sqrt(-1), // -nan
+ -log(0.0), // inf
+ log(0.0) // -inf
+ @};
+
+ int i, j, k;
+
+ for (i = 0; i < 4; i++) @{
+ for (j = 0; j < 5; j++) @{
+ for (k = 0; functions[k].name != NULL; k++) @{
+ printf("%g %s %g -> %s\n", values[i],
+ functions[k].name,
+ compare[j],
+ functions[k].func(values[i], compare[j]) ? "True" : "False");
+ @}
+ printf("\n");
+ @}
+ @}
+
+ return 0;
+@}
+@c endfile
+@end ignore
+
+@ignore
+@c file eg/test-programs/gen-float-table.py
+from math import *
+
+nan = float('NaN')
+inf = float('Inf')
+
+def eq(left, right):
+ return left == right
+
+def ne(left, right):
+ return left != right
+
+def lt(left, right):
+ return left < right
+
+def le(left, right):
+ return left <= right
+
+def gt(left, right):
+ return left > right
+
+def ge(left, right):
+ return left >= right
+
+func_map = {
+ "==": eq,
+ "!=": ne,
+ "< ": lt,
+ "<=": le,
+ "> ": gt,
+ ">=": ge,
+}
+
+compare = [2.0, nan, -nan, inf, -inf]
+values = [nan, -nan, inf, -inf]
+
+for i in range(len(values)):
+ for j in range(len(compare)):
+ for op in func_map:
+ print("%g %s %g -> %s" %
+ (values[i], op, compare[j], func_map[op](values[i], compare[j])))
+
+ print("")
+@c endfile
+@end ignore
+
@node Getting Accuracy
@subsection Getting the Accuracy You Need
@@ -35424,7 +35724,8 @@ multibyte encoding.
@itemx @ @ @ @ AWK_STRNUM,
@itemx @ @ @ @ AWK_ARRAY,
@itemx @ @ @ @ AWK_SCALAR,@ @ @ @ @ @ @ @ @ /* opaque access to a variable */
-@itemx @ @ @ @ AWK_VALUE_COOKIE@ @ @ @ /* for updating a previously created value */
+@itemx @ @ @ @ AWK_VALUE_COOKIE,@ @ @ /* for updating a previously created value */
+@itemx @ @ @ @ AWK_BOOL
@itemx @} awk_valtype_t;
This @code{enum} indicates the type of a value.
It is used in the following @code{struct}.
@@ -35437,6 +35738,7 @@ It is used in the following @code{struct}.
@itemx @ @ @ @ @ @ @ @ awk_array_t@ @ @ @ @ @ @ @ a;
@itemx @ @ @ @ @ @ @ @ awk_scalar_t@ @ @ @ @ @ @ scl;
@itemx @ @ @ @ @ @ @ @ awk_value_cookie_t@ vc;
+@itemx @ @ @ @ @ @ @ @ awk_bool_t@ @ @ @ @ @ @ @ @ b;
@itemx @ @ @ @ @} u;
@itemx @} awk_value_t;
An ``@command{awk} value.''
@@ -35452,6 +35754,7 @@ The @code{val_type} member indicates what kind of value the
@itemx #define array_cookie@ @ @ u.a
@itemx #define scalar_cookie@ @ u.scl
@itemx #define value_cookie@ @ @ u.vc
+@itemx #define bool_value@ @ @ @ @ u.b
Using these macros makes accessing the fields of the @code{awk_value_t} more
readable.
@@ -35779,6 +36082,11 @@ the regular expression of length @code{len}. It expects @code{string}
to be a @samp{char *} value pointing to data previously obtained from
@code{gawk_malloc()}, @code{gawk_calloc()}, or @code{gawk_realloc()}.
+@item static inline awk_value_t *
+@itemx make_bool(awk_bool_t boolval, awk_value_t *result);
+This function creates a boolean value in the @code{awk_value_t} variable
+pointed to by @code{result}.
+
@end table
@node API Ownership of MPFR and GMP Values
@@ -36579,7 +36887,8 @@ value type, as appropriate. This behavior is summarized in
<colspec colname="c6"/>
<colspec colname="c7"/>
<colspec colname="c8"/>
- <spanspec spanname="hspan" namest="c3" nameend="c8" align="center"/>
+ <colspec colname="c9"/>
+ <spanspec spanname="hspan" namest="c3" nameend="c9" align="center"/>
<thead>
<row><entry></entry><entry spanname="hspan"><para>Type of Actual Value</para></entry></row>
<row>
@@ -36589,6 +36898,7 @@ value type, as appropriate. This behavior is summarized in
<entry><para>Strnum</para></entry>
<entry><para>Number</para></entry>
<entry><para>Regex</para></entry>
+ <entry><para>Bool</para></entry>
<entry><para>Array</para></entry>
<entry><para>Undefined</para></entry>
</row>
@@ -36601,6 +36911,7 @@ value type, as appropriate. This behavior is summarized in
<entry><para>String</para></entry>
<entry><para>String</para></entry>
<entry><para>String</para></entry>
+ <entry><para>String</para></entry>
<entry><para>false</para></entry>
<entry><para>false</para></entry>
</row>
@@ -36613,6 +36924,7 @@ value type, as appropriate. This behavior is summarized in
<entry><para>false</para></entry>
<entry><para>false</para></entry>
<entry><para>false</para></entry>
+ <entry><para>false</para></entry>
</row>
<row>
<entry></entry>
@@ -36621,6 +36933,7 @@ value type, as appropriate. This behavior is summarized in
<entry><para>Number</para></entry>
<entry><para>Number</para></entry>
<entry><para>false</para></entry>
+ <entry><para>Number</para></entry>
<entry><para>false</para></entry>
<entry><para>false</para></entry>
</row>
@@ -36629,6 +36942,7 @@ value type, as appropriate. This behavior is summarized in
<entry><para><emphasis role="bold">Regex</emphasis></para></entry>
<entry><para>false</para></entry>
<entry><para>false</para></entry>
+ <entry><para>false</para></entry>
<entry><para>Regex</para></entry>
<entry><para>false</para></entry>
<entry><para>false</para></entry>
@@ -36636,11 +36950,23 @@ value type, as appropriate. This behavior is summarized in
</row>
<row>
<entry><para><emphasis role="bold">Requested</emphasis></para></entry>
+ <entry><para><emphasis role="bold">Bool</emphasis></para></entry>
+ <entry><para>false</para></entry>
+ <entry><para>false</para></entry>
+ <entry><para>false</para></entry>
+ <entry><para>false</para></entry>
+ <entry><para>Bool</para></entry>
+ <entry><para>false</para></entry>
+ <entry><para>false</para></entry>
+ </row>
+ <row>
+ <entry><para></para></entry>
<entry><para><emphasis role="bold">Array</emphasis></para></entry>
<entry><para>false</para></entry>
<entry><para>false</para></entry>
<entry><para>false</para></entry>
<entry><para>false</para></entry>
+ <entry><para>false</para></entry>
<entry><para>Array</para></entry>
<entry><para>false</para></entry>
</row>
@@ -36651,6 +36977,7 @@ value type, as appropriate. This behavior is summarized in
<entry><para>Scalar</para></entry>
<entry><para>Scalar</para></entry>
<entry><para>Scalar</para></entry>
+ <entry><para>Scalar</para></entry>
<entry><para>false</para></entry>
<entry><para>false</para></entry>
</row>
@@ -36661,6 +36988,7 @@ value type, as appropriate. This behavior is summarized in
<entry><para>Strnum</para></entry>
<entry><para>Number</para></entry>
<entry><para>Regex</para></entry>
+ <entry><para>Bool</para></entry>
<entry><para>Array</para></entry>
<entry><para>Undefined</para></entry>
</row>
@@ -36673,6 +37001,7 @@ value type, as appropriate. This behavior is summarized in
<entry><para>false</para></entry>
<entry><para>false</para></entry>
<entry><para>false</para></entry>
+ <entry><para>false</para></entry>
</row>
</tbody>
</tgroup>
@@ -36689,43 +37018,46 @@ value type, as appropriate. This behavior is summarized in
\vglue-1.1\baselineskip
@end tex
@c @multitable @columnfractions .166 .166 .198 .15 .15 .166
-@multitable {Requested} {Undefined} {Number} {Number} {Scalar} {Regex} {Array} {Undefined}
-@headitem @tab @tab String @tab Strnum @tab Number @tab Regex @tab Array @tab Undefined
-@item @tab @b{String} @tab String @tab String @tab String @tab String @tab false @tab false
-@item @tab @b{Strnum} @tab false @tab Strnum @tab Strnum @tab false @tab false @tab false
-@item @tab @b{Number} @tab Number @tab Number @tab Number @tab false @tab false @tab false
-@item @b{Type} @tab @b{Regex} @tab false @tab false @tab false @tab Regex @tab false @tab false
-@item @b{Requested} @tab @b{Array} @tab false @tab false @tab false @tab false @tab Array @tab false
-@item @tab @b{Scalar} @tab Scalar @tab Scalar @tab Scalar @tab Scalar @tab false @tab false
-@item @tab @b{Undefined} @tab String @tab Strnum @tab Number @tab Regex @tab Array @tab Undefined
-@item @tab @b{Value cookie} @tab false @tab false @tab false @tab false @tab false @tab false
+@multitable {Requested} {Undefined} {Number} {Number} {Scalar} {Regex} {Number} {Array} {Undefined}
+@headitem @tab @tab String @tab Strnum @tab Number @tab Regex @tab Bool @tab Array @tab Undefined
+@item @tab @b{String} @tab String @tab String @tab String @tab String @tab String @tab false @tab false
+@item @tab @b{Strnum} @tab false @tab Strnum @tab Strnum @tab false @tab false @tab false @tab false
+@item @tab @b{Number} @tab Number @tab Number @tab Number @tab false @tab Number @tab false @tab false
+@item @b{Type} @tab @b{Regex} @tab false @tab false @tab false @tab Regex @tab false @tab false @tab false
+@item @b{Requested} @tab @b{Bool} @tab false @tab false @tab false @tab false @tab Bool @tab false @tab false
+@item @tab @b{Array} @tab false @tab false @tab false @tab false @tab false @tab Array @tab false
+@item @tab @b{Scalar} @tab Scalar @tab Scalar @tab Scalar @tab Scalar @tab Scalar @tab false @tab false
+@item @tab @b{Undefined} @tab String @tab Strnum @tab Number @tab Regex @tab Bool @tab Array @tab Undefined
+@item @tab @b{Value cookie} @tab false @tab false @tab false @tab false @tab false @tab false @tab false
@end multitable
@end ifnotdocbook
@end ifnotplaintext
@ifplaintext
@verbatim
- +-------------------------------------------------------+
- | Type of Actual Value: |
- +--------+--------+--------+--------+-------+-----------+
- | String | Strnum | Number | Regex | Array | Undefined |
-+-----------+-----------+--------+--------+--------+--------+-------+-----------+
-| | String | String | String | String | String | false | false |
-| +-----------+--------+--------+--------+--------+-------+-----------+
-| | Strnum | false | Strnum | Strnum | false | false | false |
-| +-----------+--------+--------+--------+--------+-------+-----------+
-| | Number | Number | Number | Number | false | false | false |
-| +-----------+--------+--------+--------+--------+-------+-----------+
-| | Regex | false | false | false | Regex | false | false |
-| Type +-----------+--------+--------+--------+--------+-------+-----------+
-| Requested | Array | false | false | false | false | Array | false |
-| +-----------+--------+--------+--------+--------+-------+-----------+
-| | Scalar | Scalar | Scalar | Scalar | Scalar | false | false |
-| +-----------+--------+--------+--------+--------+-------+-----------+
-| | Undefined | String | Strnum | Number | Regex | Array | Undefined |
-| +-----------+--------+--------+--------+--------+-------+-----------+
-| | Value | false | false | false | false | false | false |
-| | Cookie | | | | | | |
-+-----------+-----------+--------+--------+--------+--------+-------+-----------+
+ +----------------------------------------------------------------+
+ | Type of Actual Value: |
+ +--------+--------+--------+--------+--------+-------+-----------+
+ | String | Strnum | Number | Regex | Bool | Array | Undefined |
++-----------+-----------+--------+--------+--------+--------+--------+-------+-----------+
+| | String | String | String | String | String | String | false | false |
+| +-----------+--------+--------+--------+--------+--------+-------+-----------+
+| | Strnum | false | Strnum | Strnum | false | false | false | false |
+| +-----------+--------+--------+--------+--------+--------+-------+-----------+
+| | Number | Number | Number | Number | false | Number | false | false |
+| +-----------+--------+--------+--------+--------+--------+-------+-----------+
+| | Regex | false | false | false | Regex | false | false | false |
+| +-----------+--------+--------+--------+--------+--------+-------+-----------+
+| Type | Bool | false | false | false | false | Bool | false | false |
+| Requested +-----------+--------+--------+--------+--------+--------+-------+-----------+
+| | Array | false | false | false | false | false | Array | false |
+| +-----------+--------+--------+--------+--------+--------+-------+-----------+
+| | Scalar | Scalar | Scalar | Scalar | Scalar | Scalar | false | false |
+| +-----------+--------+--------+--------+--------+--------+-------+-----------+
+| | Undefined | String | Strnum | Number | Regex | Bool | Array | Undefined |
+| +-----------+--------+--------+--------+--------+--------+-------+-----------+
+| | Value | false | false | false | false | false | false | false |
+| | Cookie | | | | | | | |
++-----------+-----------+--------+--------+--------+--------+--------+-------+-----------+
@end verbatim
@end ifplaintext
@end float
@@ -45296,8 +45628,8 @@ internationalized program to work in a particular language.
@item Logical Expression
An expression using the operators for logic, AND, OR, and NOT, written
-@samp{&&}, @samp{||}, and @samp{!} in @command{awk}. Often called Boolean
-expressions, after the mathematician who pioneered this kind of
+@samp{&&}, @samp{||}, and @samp{!} in @command{awk}. Often called @dfn{Boolean
+expressions}, after the mathematician who pioneered this kind of
mathematical logic.
@item Lvalue
generated by cgit v1.2.3 (git 2.25.1) at 2025-04-26 04:13:17 +0000