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-.\" Copyright 2004 Andries Brouwer <aeb@cwi.nl>.
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH INFINITY 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-INFINITY, NAN, HUGE_VAL, HUGE_VALF, HUGE_VALL \- floating-point constants
-.SH LIBRARY
-Math library
-.RI ( libm )
-.SH SYNOPSIS
-.nf
-.BR "#define _ISOC99_SOURCE" "      /* See feature_test_macros(7) */"
-.B #include <math.h>
-.PP
-.B INFINITY
-.PP
-.B NAN
-.PP
-.B HUGE_VAL
-.B HUGE_VALF
-.B HUGE_VALL
-.fi
-.SH DESCRIPTION
-The macro
-.B INFINITY
-expands to a
-.I float
-constant representing positive infinity.
-.PP
-The macro
-.B NAN
-expands to a
-.I float
-constant representing a quiet NaN
-(when supported).
-A
-.I quiet
-NaN is a NaN ("not-a-number") that does not raise exceptions
-when it is used in arithmetic.
-The opposite is a
-.I signaling
-NaN.
-See IEC 60559:1989.
-.PP
-The macros
-.BR HUGE_VAL ,
-.BR HUGE_VALF ,
-.B HUGE_VALL
-expand to constants of types
-.IR double ,
-.IR float ,
-and
-.IR "long double" ,
-respectively,
-that represent a large positive value, possibly positive infinity.
-.SH STANDARDS
-C11.
-.SH HISTORY
-C99.
-.PP
-On a glibc system, the macro
-.B HUGE_VAL
-is always available.
-Availability of the
-.B NAN
-macro can be tested using
-.BR "#ifdef NAN" ,
-and similarly for
-.BR INFINITY ,
-.BR HUGE_VALF ,
-.BR HUGE_VALL .
-They will be defined by
-.I <math.h>
-if
-.B _ISOC99_SOURCE
-or
-.B _GNU_SOURCE
-is defined, or
-.B __STDC_VERSION__
-is defined
-and has a value not less than 199901L.
-.SH SEE ALSO
-.BR fpclassify (3),
-.BR math_error (7)