ISFINITE(3)             NetBSD 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 con-
     verted 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 nei-
     ther 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
     fpclassify(3), isnormal(3), math(3), signbit(3)

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

NetBSD 5.0_STABLE              October 29, 2003              NetBSD 5.0_STABLE
