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NetBSD 6.1.5 - man page for isfinite (netbsd section 3)

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 repre-
     sented 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


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