ISFINITE(3)						   BSD Library Functions Manual 					       ISFINITE(3)

NAME

     isfinite -- test for finite value

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <math.h>

     int
     isfinite(real-floating x);

DESCRIPTION

     The isfinite() determines whether its argument x has a finite value.  An argument represented in a format wider than its semantic type is
     converted to its semantic type first.  The determination is then based on the type of the argument.

   IEEE 754
     It is determined whether the value of x is zero, subnormal, or normal, and neither infinite nor NaN.

   VAX
     It is determined whether the value of x is true zero or finite, and neither dirty zero nor ROP.

RETURN VALUES

     The isfinite() macro returns a non-zero value if the value of x is finite.  Otherwise 0 is returned.

ERRORS

     No errors are defined.

SEE ALSO

     finite(3), fpclassify(3), isnormal(3), math(3), signbit(3)

STANDARDS

     The isfinite() macro conforms to ISO/IEC 9899:1999 (``ISO C99'').

BSD
								  August 6, 2011							       BSD