finite - Online Linux Manual PageSection : 3
Updated : 2023-02-05
Source : Linux man-pages 6.03

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NAMEfinite, finitef, finitel, isinf, isinff, isinfl, isnan, isnanf, isnanl − BSD floating-point classification functions

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LIBRARYMath library (libm, −lm)

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SYNOPSIS#include <math.h>int finite(double x); int finitef(float x); int finitel(long double x);int isinf(double x); int isinff(float x); int isinfl(long double x);int isnan(double x); int isnanf(float x); int isnanl(long double x);Feature Test Macro Requirements for glibc (see feature_test_macros(7)): finite(), finitef(), finitel(): /* glibc >= 2.19: */ _DEFAULT_SOURCE || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCEisinf(): _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || /* glibc >= 2.19: */ _DEFAULT_SOURCE || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCEisinff(), isinfl(): /* glibc >= 2.19: */ _DEFAULT_SOURCE || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCEisnan(): _XOPEN_SOURCE || _ISOC99_SOURCE || /* glibc >= 2.19: */ _DEFAULT_SOURCE || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCEisnanf(), isnanl(): _XOPEN_SOURCE >= 600 || /* glibc >= 2.19: */ _DEFAULT_SOURCE || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

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DESCRIPTIONThe finite(), finitef(), and finitel() functions return a nonzero value if x is neither infinite nor a "not-a-number" (NaN) value, and 0 otherwise. The isnan(), isnanf(), and isnanl() functions return a nonzero value if x is a NaN value, and 0 otherwise. The isinf(), isinff(), and isinfl() functions return 1 if x is positive infinity, −1 if x is negative infinity, and 0 otherwise.

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ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7). InterfaceAttributeValue finite(), finitef(), finitel(), isinf(), isinff(), isinfl(), isnan(), isnanf(), isnanl() Thread safetyMT-Safe

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NOTESNote that these functions are obsolete. C99 defines macros isfinite(), isinf(), and isnan() (for all types) replacing them. Further note that the C99 isinf() has weaker guarantees on the return value. See fpclassify(3).

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SEE ALSOfpclassify(3) 0

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