point in formatted real numbers is affected by the LC_NUMERIC locale.
See L<perllocale>.
+If Perl understands "quads" (64-bit integers) (this requires
+either that the platform natively supports quads or that Perl
+has been specifically compiled to support quads), the flags
+
+ d u o x X b i D U O
+
+print quads, and they may optionally be preceded by
+
+ ll L q
+
+For example
+
+ %lld %16LX %qo
+
+You can find out whether your Perl supports long doubles via L<Config>:
+
+ use Config;
+ $Config{use64bits} and print "quads\n";
+
+If Perl understands "long doubles" (this requires that the platform
+supports long doubles), the flags
+
+ e f g E F G
+
+may optionally be preceded by
+
+ ll L
+
+For example
+
+ %llf %Lg
+
+You can find out whether your Perl supports long doubles via L<Config>:
+
+ use Config;
+ $Config{d_longdbl} and print "long doubles\n";
+
=item sqrt EXPR
=item sqrt