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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-24 04:52:24 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-24 04:52:24 +0000 |
commit | 100d1b33f088fd38f69129afff7f9c2a1e084a57 (patch) | |
tree | 5bf6b0bb14f22ecf0a5e9439fdd4c4758402400c /man/man3/INFINITY.3 | |
parent | Releasing progress-linux version 6.7-2~progress7.99u1. (diff) | |
download | manpages-100d1b33f088fd38f69129afff7f9c2a1e084a57.tar.xz manpages-100d1b33f088fd38f69129afff7f9c2a1e084a57.zip |
Merging upstream version 6.8.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'man/man3/INFINITY.3')
-rw-r--r-- | man/man3/INFINITY.3 | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/man/man3/INFINITY.3 b/man/man3/INFINITY.3 new file mode 100644 index 0000000..334c79d --- /dev/null +++ b/man/man3/INFINITY.3 @@ -0,0 +1,85 @@ +.\" Copyright 2004 Andries Brouwer <aeb@cwi.nl>. +.\" +.\" SPDX-License-Identifier: Linux-man-pages-copyleft +.\" +.TH INFINITY 3 2024-05-02 "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> +.P +.B INFINITY +.P +.B NAN +.P +.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. +.P +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. +.P +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. +.P +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) |