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NEXTAFTER(3)               Linux Programmer's Manual              NEXTAFTER(3)



NAME
       nextafter, nextafterf, nextafterl, nexttoward, nexttowardf, nexttowardl
       - floating point number manipulation

SYNOPSIS
       #include <&lt;math.h>&gt;

       double nextafter(double x, double y);
       float nextafterf(float x, float y);
       long double nextafterl(long double x, long double y);

       double nexttoward(double x, long double y);
       float nexttowardf(float x, long double y);
       long double nexttowardl(long double x, long double y);

       Link with -lm.

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       All functions shown above: _BSD_SOURCE || _SVID_SOURCE ||
       _XOPEN_SOURCE >= 500 || _ISOC99_SOURCE; or cc -std=c99

DESCRIPTION
       The  nextafter()  functions return the next representable neighbor of x
       in the direction towards y.  The size of the step  between  x  and  the
       result depends on the type of the result.  If x = y the function simply
       returns y.  If either value is NaN, then NaN is returned.  Otherwise  a
       value  corresponding  to  the value of the least significant bit in the
       mantissa is added or subtracted, depending on the direction.

       The nexttoward() functions do the same as  the  nextafter()  functions,
       except that they have a long double second argument.

       These  functions  will  signal overflow or underflow if the result goes
       outside of the range of normalized numbers.

CONFORMING TO
       C99.  This function is defined in IEC 559 (and the appendix with recom-
       mended functions in IEEE 754/IEEE 854).

SEE ALSO
       nearbyint(3)

COLOPHON
       This  page  is  part of release 3.05 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.



GNU                               2007-07-26                      NEXTAFTER(3)