The procedure number->string takes a number and a
radix and returns as a string an external representation
of the given number in the given radix such that
(let ((number number)
(radix radix))
(eqv? number
(string->number (number->string number radix)
radix)))
is true. It is an error if no possible result makes this expression true.
If present, radix must be an exact integer
in the range 2 to 36, inclusive.
If omitted, radix defaults to 10.
If z is inexact, the radix is 10, and the above expression
can be satisfied by a result that contains a decimal point,
then the result contains a decimal point and is expressed
using the minimum number of digits (exclusive of exponent
and trailing zeroes) needed to make the above expression;
otherwise the format of the result is unspecified.
The result returned by number->string never contains an
explicit radix prefix.
Note:
The error case can occur only when z is not a complex
number or is a complex number with a non-rational real or
imaginary part.
Rationale: If z is an inexact number and the radix is 10,
then the above expression is normally satisfied by a result containing
a decimal point. The unspecified case allows for infinities, NaNs,
and unusual representations.
