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

ISINF(3)			   BSD Library Functions Manual 			 ISINF(3)

NAME
     isinf -- test for infinity

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <math.h>

     int
     isinf(real-floating x);

DESCRIPTION
     The isinf() macro determines whether its argument x is an infinity (positive or negative).
     An argument represented in a format wider than its semantic type is converted to its seman-
     tic type first.  The determination is then based on the type of the argument.

   IEEE 754
     It is determined whether the value of x is an infinity.

   VAX
     Infinities are not supported.

RETURN VALUES
     The isinf() macro returns a non-zero value if the value of x is an infinity.  Otherwise 0 is
     returned.

SEE ALSO
     fpclassify(3), isfinite(3), isinff(3), isnan(3), isnanf(3), isnormal(3), math(3), signbit(3)

     IEEE Standard for Binary Floating-Point Arithmetic, Std 754-1985, ANSI.

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

BSD					  March 5, 2004 				      BSD


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