Section : 3 Updated : 2023-02-05 Source : Linux man-pages 6.03 NAMEfinite, finitef, finitel, isinf, isinff, isinfl, isnan, isnanf, isnanl − BSD floating-point classification functions LIBRARYMath library (libm, −lm)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_SOURCEDESCRIPTIONThe 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. ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7).
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).SEE ALSOfpclassify(3)0 Johanes Gumabo Data Size : 13,079 byte man-finitef.3Build : 2025-03-22, 13:26 : Visitor Screen : x Visitor Counter ( page / site ) : 40 / 2,298,450 Visitor ID : : Visitor IP : 216.73.217.6 : Visitor Provider : AMAZON-02 : Provider Position ( lat x lon ) : 39.962500 x -83.006100 : x Provider Accuracy Radius ( km ) : 20 : Provider City : Columbus : Provider Province : Ohio , : , Provider Country : United States : Provider Continent : North America : Visitor Recorder : Version : Visitor Recorder : Library : Online Linux Manual Page : Version : Online Linux Manual Page - Fedora.40 - march=x86-64 - mtune=generic - 25.03.22 Online Linux Manual Page : Library : lib_c - 24.10.03 - march=x86-64 - mtune=generic - Fedora.40 Online Linux Manual Page : Library : lib_m - 24.10.03 - march=x86-64 - mtune=generic - Fedora.40 Data Base : Version : Online Linux Manual Page Database - 24.04.13 - march=x86-64 - mtune=generic - fedora-38 Data Base : Library : lib_c - 23.02.07 - march=x86-64 - mtune=generic - fedora.36
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