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FINITE(3) |
Library Functions Manual |
FINITE(3) |
NAME
finite, finitef — tests for finite values
LIBRARY
Math Library (libm, -lm)
SYNOPSIS
#include <math.h>
int
finite(double x);
int
finitef(float x);
DESCRIPTION
The
finite() function returns the value 1 when
-infinity < x < +infinity.
Otherwise a zero is returned (that is, |x| = infinity or x is NaN).
STANDARDS
The described functions conform to IEEE Std 754-1985. Note that unlike
isfinite(3), neither function is present in the
ISO C-language standards or in the
IEEE POSIX standards.
HISTORY
The finite and finitef() functions first appeared in 4.3BSD.