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nan(3m) [opensolaris man page]

nan(3M) 						  Mathematical Library Functions						   nan(3M)

nan, nanf, nanl - return quiet NaN SYNOPSIS
c99 [ flag... ] file... -lm [ library... ] #include <math.h> double nan(const char *tagp); float nanf(const char *tagp); long double nanl(const char *tagp); DESCRIPTION
The function call nan("n-char-sequence") is equivalent to: strtod("NAN(n-char-sequence)", (char **) NULL); The function call nan(" ") is equivalent to: strtod("NAN()", (char **) NULL) If tagp does not point to an n-char sequence or an empty string, the function call is equivalent to: strtod("NAN", (char **) NULL) Function calls to nanf() and nanl() are equivalent to the corresponding function calls to strtof() and strtold(). See strtod(3C). RETURN VALUES
These functions return a quiet NaN. ERRORS
No errors are defined. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
math.h(3HEAD), strtod(3C), attributes(5), standards(5) SunOS 5.11 12 Jul 2006 nan(3M)

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NAN(3)							     Linux Programmer's Manual							    NAN(3)

nan, nanf, nanl - return 'Not a Number' SYNOPSIS
#include <math.h> double nan(const char *tagp); float nanf(const char *tagp); long double nanl(const char *tagp); Link with -lm. Feature Test Macro Requirements for glibc (see feature_test_macros(7)): nan(), nanf(), nanl(): _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L; or cc -std=c99 DESCRIPTION
These functions return a representation (determined by tagp) of a quiet NaN. If the implementation does not support quiet NaNs, these functions return zero. The call nan("char-sequence") is equivalent to: strtod("NAN(char-sequence)", NULL); Similarly, calls to nanf() and nanl() are equivalent to analogous calls to strtof(3) and strtold(3). The argument tagp is used in an unspecified manner. On IEEE 754 systems, there are many representations of NaN, and tagp selects one. On other systems it may do nothing. VERSIONS
These functions first appeared in glibc in version 2.1. CONFORMING TO
C99, POSIX.1-2001. See also IEC 559 and the appendix with recommended functions in IEEE 754/IEEE 854. SEE ALSO
isnan(3), strtod(3), math_error(7) COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at GNU
2010-09-20 NAN(3)

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