Copyright 2004 Andries Brouwer <firstname.lastname@example.org>. %%%LICENSE_START(VERBATIM) Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. Since the Linu...
NAMEINFINITY, NAN, HUGE_VAL, HUGE_VALF, HUGE_VALL - floating-point constants
#define _ISOC99_SOURCE /* See feature_test_macros(7) */
#include <math.h> INFINITY NAN HUGE_VAL
DESCRIPTIONThe 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.