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NAN(3) Library Functions Manual NAN(3) NAME nan, nanf, nanl - return quiet NaN LIBRARY Math Library (libm, -lm) SYNOPSIS #include <math.h> double nan(const char *tagp); float nanf(const char *tagp); long double nanl(const char *tagp); DESCRIPTION The call nan("n-char-sequence") is equivalent to the call strtod("NAN(n-char-sequence)", NULL). The call nan("") is equivalent to the call strtod("NAN()", NULL). The nanf() and nanl() functions are equivalent to nan() but substituting strtof() and strtold(), respectively. RETURN VALUES IEEE 754 The nan(), nanf(), and nanl() functions return a quiet NaN as specified by tagp. VAX The nan(), nanf(), and nanl() functions return zero. SEE ALSO math(3), strtod(3) STANDARDS The nan(), nanf(), and nanl() functions conform to ISO/IEC 9899:1999 ("ISO C99"). NetBSD 10.99 March 15, 2006 NetBSD 10.99