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ISINF(3)                   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 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 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'').

NetBSD 7.1.2                     March 5, 2004                    NetBSD 7.1.2