Copyright (c) 2007 David Schultz <das@FreeBSD.org>
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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SUCH DAMAGE.
$FreeBSD: releng/10.2/lib/msun/man/nan.3 174684 2007-12-16 21:19:28Z das $
.Dd December 16, 2007 .Dt NAN 3 .Os .Sh NAME .Nm nan , .Nm nanf , .Nm nanl .Nd quiet \*(Nas .Sh LIBRARY .Lb libm .Sh SYNOPSIS n math.h .Ft double .Fn nan "const char *s" .Ft float .Fn nanf "const char *s" .Ft long double .Fn nanl "const char *s" .Sh DESCRIPTION The .Dv NAN macro expands to a quiet \*(Na (Not A Number). Similarly, each of the .Fn nan , .Fn nanf , and .Fn nanl functions generate a quiet \*(Na value without raising an invalid exception. The argument .Fa s should point to either an empty string or a hexadecimal representation of a non-negative integer (e.g., "0x1234".) In the latter case, the integer is encoded in some free bits in the representation of the \*(Na, which sometimes store machine-specific information about why a particular \*(Na was generated. There are 22 such bits available for .Vt float variables, 51 bits for .Vt double variables, and at least 51 bits for a .Vt long double . If .Fa s is improperly formatted or represents an integer that is too large, then the particular encoding of the quiet \*(Na that is returned is indeterminate. .Sh COMPATIBILITY Calling these functions with a non-empty string isn't portable. Another operating system may translate the string into a different \*(Na encoding, and furthermore, the meaning of a given \*(Na encoding varies across machine architectures. If you understood the innards of a particular platform well enough to know what string to use, then you would have no need for these functions anyway, so don't use them. Use the .Dv NAN macro instead. .Sh SEE ALSO .Xr fenv 3 , .Xr ieee 3 , .Xr isnan 3 , .Xr math 3 , .Xr strtod 3 .Sh STANDARDS The .Fn nan , .Fn nanf , and .Fn nanl functions and the .Dv NAN macro conform to .St -isoC-99 .
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
$FreeBSD: releng/10.2/lib/msun/man/nan.3 174684 2007-12-16 21:19:28Z das $
.Dd December 16, 2007 .Dt NAN 3 .Os .Sh NAME .Nm nan , .Nm nanf , .Nm nanl .Nd quiet \*(Nas .Sh LIBRARY .Lb libm .Sh SYNOPSIS n math.h .Ft double .Fn nan "const char *s" .Ft float .Fn nanf "const char *s" .Ft long double .Fn nanl "const char *s" .Sh DESCRIPTION The .Dv NAN macro expands to a quiet \*(Na (Not A Number). Similarly, each of the .Fn nan , .Fn nanf , and .Fn nanl functions generate a quiet \*(Na value without raising an invalid exception. The argument .Fa s should point to either an empty string or a hexadecimal representation of a non-negative integer (e.g., "0x1234".) In the latter case, the integer is encoded in some free bits in the representation of the \*(Na, which sometimes store machine-specific information about why a particular \*(Na was generated. There are 22 such bits available for .Vt float variables, 51 bits for .Vt double variables, and at least 51 bits for a .Vt long double . If .Fa s is improperly formatted or represents an integer that is too large, then the particular encoding of the quiet \*(Na that is returned is indeterminate. .Sh COMPATIBILITY Calling these functions with a non-empty string isn't portable. Another operating system may translate the string into a different \*(Na encoding, and furthermore, the meaning of a given \*(Na encoding varies across machine architectures. If you understood the innards of a particular platform well enough to know what string to use, then you would have no need for these functions anyway, so don't use them. Use the .Dv NAN macro instead. .Sh SEE ALSO .Xr fenv 3 , .Xr ieee 3 , .Xr isnan 3 , .Xr math 3 , .Xr strtod 3 .Sh STANDARDS The .Fn nan , .Fn nanf , and .Fn nanl functions and the .Dv NAN macro conform to .St -isoC-99 .