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nan(3) [opendarwin man page]

NAN(3)							   BSD Library Functions Manual 						    NAN(3)

NAME
nan -- generate a quiet NaN SYNOPSIS
#include <math.h> double nan(const char *tagp); float nanf(const char *tagp); DESCRIPTION
The nan() and nanf() functions return a quiet NaN. The character string tagp is converted to an integer, which is clipped to the range 0 to 255, inclusive. This value is used as the NaN code. The NaN code is placed in the 8th through 15th most significant bits of the fraction field of the resulting NaN. SPECIAL VALUES
If tagp is empty, 0 is used for the NaN code. STANDARDS
The nan() and nanf functions conform to ISO/IEC 9899:1999(E). BSD
July 24, 2003 BSD

Check Out this Related Man Page

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

NAME
nan, nanf, nanl - return quiet NaN SYNOPSIS
cc [ 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 5.10 1 Sep 2002 nan(3M)
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