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nanl(3) [netbsd man page]

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

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 strod("NAN(n-char-sequence)", NULL). The call nan("") is equivalent to the call strod("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''). BSD
March 15, 2006 BSD

Check Out this Related Man Page

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

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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