— procedure: **number->string**` z`

— procedure:**number->string**` z radix`

— procedure:

Radixmust be an exact integer, either 2, 8, 10, or 16. If omitted,radixdefaults to 10. 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 ((numbernumber) (radixradix)) (eqv? number (string->number (number->string number radix) radix)))is true. It is an error if no possible result makes this expression true.

If

zis 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 true [howtoprint], [howtoread]; 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 whenzis not a complex number or is a complex number with a non-rational real or imaginary part.Rationale:Ifzis an inexact number represented using flonums, 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 non-flonum representations.

— procedure: **string->number**` string`

— procedure:**string->number**` string radix`

— procedure:

Returns a number of the maximally precise representation expressed by the given

string.Radixmust be an exact integer, either 2, 8, 10, or 16. If supplied,radixis a default radix that may be overridden by an explicit radix prefix instring(e.g."#o177"). Ifradixis not supplied, then the default radix is 10. Ifstringis not a syntactically valid notation for a number, then string->number returns#f.(string->number "100") ==> 100 (string->number "100" 16) ==> 256 (string->number "1e2") ==> 100.0 (string->number "15##") ==> 1500.0Note:The domain of string->number may be restricted by implementations in the following ways. String->number is permitted to return#fwheneverstringcontains an explicit radix prefix. If all numbers supported by an implementation are real, then string->number is permitted to return#fwheneverstringuses the polar or rectangular notations for complex numbers. If all numbers are integers, then string->number may return#fwhenever the fractional notation is used. If all numbers are exact, then string->number may return#fwhenever an exponent marker or explicit exactness prefix is used, or if a#appears in place of a digit. If all inexact numbers are integers, then string->number may return#fwhenever a decimal point is used.