The next arg is printed as a float in fixed-format notation.
The full form is ~d,n,w,padchar$.
The parameter d is the number
of digits to print after the decimal point (default value 2);
n is the minimum number of digits to print before the decimal
point (default value 1);
w is the minimum total width of the field to be printed (default
value 0).
First padding and the sign are output.
If the arg is negative, then a minus sign is printed;
if the arg is not negative, then a plus sign is printed
if and only if the @ modifier was supplied.
If the : modifier is used, the sign appears before any padding,
and otherwise after the padding.
If w is supplied and the number of other characters to be output
is less than w, then copies of padchar (which defaults
to a space) are output to
make the total field width equal w.
Then n digits are printed for the integer part of arg,
with leading zeros if necessary; then a decimal point;
then d digits of fraction, properly rounded.
If the magnitude of arg is so large that more than m digits would
have to be printed, where m is the larger of w and 100, then an
implementation is free, at its discretion, to print the number using
exponential notation instead, as if by the directive
~w,q,,,,padcharE, where w and padchar are
present or omitted according to whether they were present or omitted in
the ~$ directive, and where q=d+n- 1,
where d and n are the (possibly default) values given to the
~$ directive.
If arg is a rational number, then it is coerced to be a single float and then printed. Alternatively, an implementation is permitted to process a rational number by any other method that has essentially the same behavior but avoids loss of precision or overflow because of the coercion.
If arg is a complex number or some non-numeric
object,
then it is printed using the format directive ~wD,
thereby printing it in decimal radix and a minimum field width of w.
~$ binds *print-escape* to false
and *print-readably* to false.