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-'\" t
-.\" Copyright 2008, Linux Foundation, written by Michael Kerrisk
-.\"     <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH erfc 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-erfc, erfcf, erfcl \- complementary error function
-.SH LIBRARY
-Math library
-.RI ( libm ", " \-lm )
-.SH SYNOPSIS
-.nf
-.B #include <math.h>
-.P
-.BI "double erfc(double " x );
-.BI "float erfcf(float " x );
-.BI "long double erfcl(long double " x );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR erfc ():
-.nf
-    _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE
-        || /* Since glibc 2.19: */ _DEFAULT_SOURCE
-        || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
-.fi
-.P
-.BR erfcf (),
-.BR erfcl ():
-.nf
-    _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
-        || /* Since glibc 2.19: */ _DEFAULT_SOURCE
-        || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
-.fi
-.SH DESCRIPTION
-These functions return the complementary error function of
-.IR x ,
-that is, 1.0 \- erf(x).
-.SH RETURN VALUE
-On success, these functions return the complementary error function of
-.IR x ,
-a value in the range [0,2].
-.P
-If
-.I x
-is a NaN, a NaN is returned.
-.P
-If
-.I x
-is +0 or \-0, 1 is returned.
-.P
-If
-.I x
-is positive infinity,
-+0 is returned.
-.P
-If
-.I x
-is negative infinity,
-+2 is returned.
-.P
-If the function result underflows and produces an unrepresentable value,
-the return value is 0.0.
-.P
-If the function result underflows but produces a representable
-(i.e., subnormal) value,
-.\" e.g., erfc(27) on x86-32
-that value is returned, and
-a range error occurs.
-.SH ERRORS
-See
-.BR math_error (7)
-for information on how to determine whether an error has occurred
-when calling these functions.
-.P
-The following errors can occur:
-.TP
-Range error: result underflow (result is subnormal)
-.\" .I errno
-.\" is set to
-.\" .BR ERANGE .
-An underflow floating-point exception
-.RB ( FE_UNDERFLOW )
-is raised.
-.P
-These functions do not set
-.IR errno .
-.\" It is intentional that these functions do not set errno for this case
-.\" see https://www.sourceware.org/bugzilla/show_bug.cgi?id=6785
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface	Attribute	Value
-T{
-.na
-.nh
-.BR erfc (),
-.BR erfcf (),
-.BR erfcl ()
-T}	Thread safety	MT-Safe
-.TE
-.SH STANDARDS
-C11, POSIX.1-2008.
-.SH HISTORY
-C99, POSIX.1-2001.
-.P
-The variant returning
-.I double
-also conforms to
-SVr4, 4.3BSD.
-.SH NOTES
-The
-.BR erfc (),
-.BR erfcf (),
-and
-.BR erfcl ()
-functions are provided to avoid the loss accuracy that
-would occur for the calculation 1-erf(x) for large values of
-.I x
-(for which the value of erf(x) approaches 1).
-.SH SEE ALSO
-.BR cerf (3),
-.BR erf (3),
-.BR exp (3)