INFINITY, NAN, HUGE_VAL, HUGE_VALF, HUGE_VALL: konstanty s pohyblivou řádovou čárkou

Originální popis anglicky: INFINITY, NAN, HUGE_VAL, HUGE_VALF, HUGE_VALL - floating point constants

Návod, kniha: Linux Programmer's Manual

STRUČNĚ

#define _ISOC99_SOURCE
 
#include <math.h>
 
INFINITY
 
NAN
 
HUGE_VAL
 
HUGE_VALF
 
HUGE_VALL

POPIS / INSTRUKCE

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 signalling 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 plus infinity.

DOSTUPNOST

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.

ODPOVÍDAJÍCÍ

C99

SOUVISEJÍCÍ

fpclassify(3)