INFINITY
NAME
SYNOPSIS
DESCRIPTION
CONFORMING TO
SEE ALSO
COLOPHON
NAME
INFINITY, NAN, HUGE_VAL, HUGE_VALF, HUGE_VALL − floating-point constants
SYNOPSIS
#define _ISOC99_SOURCE /bin /boot /dead.letter /dev /etc /home /initrd /lib /lib64 /lost+found /media /mnt /opt /proc /release-notes.html /release-notes.txt /root /run /sbin /srv /sys /tmp /usr /var See feature_test_macros(7) bodies/ usr/
#include
INFINITY
NAN
HUGE_VAL
HUGE_VALF
HUGE_VALL
DESCRIPTION
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.
CONFORMING TO
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
SEE ALSO
fpclassify(3), math_error(7)
COLOPHON
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