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Document '%F' format specifier

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The '%F' format specifier was implemented in commit 6c46718f9f on
2000-08-23, but remains undocumented in the manual.
https://stackoverflow.com/questions/75157669/format-specifier-f-missing-from-glibcs-documentation

Fix that.

Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
This commit is contained in:
Paul Pluzhnikov 2023-01-25 00:39:31 +00:00
parent 33f0f58b59
commit 0674613e66
1 changed files with 12 additions and 11 deletions
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23
manual/stdio.texi
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@ -1845,8 +1845,9 @@ Print an integer as an unsigned hexadecimal number. @samp{%x} uses
lower-case letters and @samp{%X} uses upper-case. @xref{Integer
Conversions}, for details.
@item @samp{%f}
@item @samp{%f}, @samp{%F}
Print a floating-point number in normal (fixed-point) notation.
@samp{%f} uses lower-case letters and @samp{%F} uses upper-case.
@xref{Floating-Point Conversions}, for details.
@item @samp{%e}, @samp{%E}
@ -2073,11 +2074,11 @@ various format options, using the template string:
@subsection Floating-Point Conversions
This section discusses the conversion specifications for floating-point
numbers: the @samp{%f}, @samp{%e}, @samp{%E}, @samp{%g}, and @samp{%G}
conversions.
numbers: the @samp{%f}, @samp{%F}, @samp{%e}, @samp{%E}, @samp{%g}, and
@samp{%G} conversions.
The @samp{%f} conversion prints its argument in fixed-point notation,
producing output of the form
The @samp{%f} and @samp{%F} conversions print their argument in fixed-point
notation, producing output of the form
@w{[@code{-}]@var{ddd}@code{.}@var{ddd}},
where the number of digits following the decimal point is controlled
by the precision you specify.
@ -2093,7 +2094,7 @@ the precision. The exponent always contains at least two digits. The
The @samp{%g} and @samp{%G} conversions print the argument in the style
of @samp{%e} or @samp{%E} (respectively) if the exponent would be less
than -4 or greater than or equal to the precision; otherwise they use
the @samp{%f} style. A precision of @code{0}, is taken as 1.
the @samp{%f} or @samp{%F} style. A precision of @code{0}, is taken as 1.
Trailing zeros are removed from the fractional portion of the result and
a decimal-point character appears only if it is followed by a digit.
@ -2123,7 +2124,7 @@ If the value to be printed represents infinity or a NaN, the output is
@w{[@code{-}]@code{inf}} or @code{nan} respectively if the conversion
specifier is @samp{%a}, @samp{%e}, @samp{%f}, or @samp{%g} and it is
@w{[@code{-}]@code{INF}} or @code{NAN} respectively if the conversion is
@samp{%A}, @samp{%E}, or @samp{%G}. On some implementations, a NaN
@samp{%A}, @samp{%E}, @samp{%F} or @samp{%G}. On some implementations, a NaN
may result in longer output with information about the payload of the
NaN; ISO C2X defines a macro @code{_PRINTF_NAN_LEN_MAX} giving the
maximum length of such output.
@ -2162,8 +2163,8 @@ specified.
@end table
The precision specifies how many digits follow the decimal-point
character for the @samp{%f}, @samp{%e}, and @samp{%E} conversions. For
these conversions, the default precision is @code{6}. If the precision
character for the @samp{%f}, @samp{%F}, @samp{%e}, and @samp{%E} conversions.
For these conversions, the default precision is @code{6}. If the precision
is explicitly @code{0}, this suppresses the decimal point character
entirely. For the @samp{%g} and @samp{%G} conversions, the precision
specifies how many significant digits to print. Significant digits are
@ -3535,7 +3536,7 @@ Matches an unsigned integer written in decimal radix.
Matches an unsigned integer written in hexadecimal radix.
@xref{Numeric Input Conversions}.
@item @samp{%e}, @samp{%f}, @samp{%g}, @samp{%E}, @samp{%G}
@item @samp{%e}, @samp{%f}, @samp{%g}, @samp{%E}, @samp{%F}, @samp{%G}
Matches an optionally signed floating-point number. @xref{Numeric Input
Conversions}.
@ -3691,7 +3692,7 @@ Specifies that the argument is a @code{size_t *}.
This modifier was introduced in @w{ISO C99}.
@end table
All of the @samp{%e}, @samp{%f}, @samp{%g}, @samp{%E}, and @samp{%G}
All of the @samp{%e}, @samp{%f}, @samp{%g}, @samp{%E}, @samp{%F} and @samp{%G}
input conversions are interchangeable. They all match an optionally
signed floating point number, in the same syntax as for the
@code{strtod} function (@pxref{Parsing of Floats}).