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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | STANDARDS | HISTORY | SEE ALSO | COLOPHON |
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INFINITY(3) Library Functions Manual INFINITY(3)
INFINITY, NAN, HUGE_VAL, HUGE_VALF, HUGE_VALL - floating-point
constants
Math library (libm)
#define _ISOC99_SOURCE /* See feature_test_macros(7) */
#include <math.h>
INFINITY
NAN
HUGE_VAL
HUGE_VALF
HUGE_VALL
The macro INFINITY expands to a float constant representing
positive infinity.
The macro NAN expands to a float constant representing a quiet
NaN (when supported). A quiet NaN is a NaN ("not-a-number") that
does not raise exceptions when it is used in arithmetic. The
opposite is a signaling NaN. See IEC 60559:1989.
The macros HUGE_VAL, HUGE_VALF, HUGE_VALL expand to constants of
types double, float, and long double, respectively, that
represent a large positive value, possibly positive infinity.
C11.
C99.
On a glibc system, the macro HUGE_VAL is always available.
Availability of the NAN macro can be tested using #ifdef NAN, and
similarly for INFINITY, HUGE_VALF, HUGE_VALL. They will be
defined by <math.h> if _ISOC99_SOURCE or _GNU_SOURCE is defined,
or __STDC_VERSION__ is defined and has a value not less than
199901L.
fpclassify(3), math_error(7)
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Linux man-pages 6.9.1 2024-05-02 INFINITY(3)
Pages that refer to this page: fpclassify(3), math_error(7)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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