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21.2.9 Converting Numbers To and From Strings
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-- Scheme Procedure: number->string n [radix]
-- C Function: scm_number_to_string (n, radix)
Return a string holding the external representation of the number
N in the given RADIX. If N is inexact, a radix of 10 will be used.
-- Scheme Procedure: string->number string [radix]
-- C Function: scm_string_to_number (string, radix)
Return a number of the maximally precise representation expressed
by the given STRING. RADIX must be an exact integer, either 2, 8,
10, or 16. If supplied, RADIX is a default radix that may be
overridden by an explicit radix prefix in STRING (e.g. "#o177").
If RADIX is not supplied, then the default radix is 10. If string
is not a syntactically valid notation for a number, then
`string->number' returns `#f'.
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