FINITE(3) BSD Programmer's Manual FINITE(3)
finite, finitef - tests for finite values
#include <math.h> int finite(double x); int finitef(float x);
The finite() function returns the value 1 when -Infinity < x < +Infinity. Otherwise a zero is returned (that is, |x| = Infinity or x is NaN).
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.
The finite and finitef() functions first appeared in 4.3BSD. MirOS BSD #10-current July 28, 2011 1
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