INFINITY - Online Linux Manual PageSection : 3
Updated : 2022-10-09
Source : Linux man-pages 6.03

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NAMEINFINITY, NAN, HUGE_VAL, HUGE_VALF, HUGE_VALL − floating-point constants

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LIBRARYMath library (libm)

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SYNOPSIS#define _ISOC99_SOURCE /* See feature_test_macros(7) */ #include <math.h>INFINITYNANHUGE_VAL HUGE_VALF HUGE_VALL

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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.

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STANDARDSC99. 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.

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SEE ALSOfpclassify(3), math_error(7) 0

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