Manpage of INFINITY

INFINITY

Section: Linux Programmer's Manual (3)
Updated: 2007-07-26
Index
 

NAME

INFINITY, NAN, HUGE_VAL, HUGE_VALF, HUGE_VALL - floating-point constants  

SYNOPSIS

#define _ISOC99_SOURCE      /* See feature_test_macros(7) */

#include <math.h>INFINITYNANHUGE_VAL
HUGE_VALF
HUGE_VALL
 

DESCRIPTION

The macro INFINITYexpands to a floatconstant representing positive infinity.

The macro NANexpands to a floatconstant representing a quiet NaN (when supported). A quietNaN is a NaN ("not-a-number") that does not raise exceptions when it is used in arithmetic. The opposite is a signalingNaN. See IEC 60559:1989.

The macros HUGE_VAL, HUGE_VALF, HUGE_VALLexpand to constants of types double, floatand long double, respectively, that represent a large positive value, possibly positive infinity.  

CONFORMING TO

C99.  

AVAILABILITY

On a glibc system, the macro HUGE_VALis always available. Availability of the NANmacro can be tested using #ifdef NAN, and similarly for INFINITY, HUGE_VALF, HUGE_VALL. They will be defined by <math.h>if _ISOC99_SOURCEor _GNU_SOURCEis defined, or __STDC_VERSION__is defined and has a value not less than 199901L.  

SEE ALSO

fpclassify(3), math_error(7)


 

Index

NAME
SYNOPSIS
DESCRIPTION
CONFORMING TO
AVAILABILITY
SEE ALSO

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