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man:nextdownl

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

NAME

     nextup,  nextupf, nextupl, nextdown, nextdownf, nextdownl - return next
     floating-point number toward positive/negative infinity

SYNOPSIS

     #define _GNU_SOURCE     /* See feature_test_macros(7) */
     #include <math.h>
     double nextup(double x);
     float nextupf(float x);
     long double nextupl(long double x);
     double nextdown(double x);
     float nextdownf(float x);
     long double nextdownl(long double x);
     Link with -lm.

DESCRIPTION

     The nextup(), nextupf(), and nextupl() functions return the next repre-
     sentable floating-point number greater than x.
     If x is the smallest representable negative number in the corresponding
     type, these functions return -0.  If x is 0, the returned value is  the
     smallest representable positive number of the corresponding type.
     If x is positive infinity, the returned value is positive infinity.  If
     x is negative infinity, the returned value is the largest representable
     finite negative number of the corresponding type.
     If x is Nan, the returned value is NaN.
     The value returned by nextdown(x) is -nextup(-x), and similarly for the
     other types.

RETURN VALUE

     See DESCRIPTION.

VERSIONS

     These functions first appeared in glibc in version 2.24.

ATTRIBUTES

     For  an  explanation  of  the  terms  used   in   this   section,   see
     attributes(7).
     allbox; lbw36 lb lb l l l.  Interface Attribute Value T{ nextup(), nex-
     tupf(), nextupl(),
     nextdown(), nextdownf(), nextdownl() T}   Thread safety  MT-Safe

CONFORMING TO

     These functions are described in  IEEE  Std  754-2008  -  Standard  for
     Floating-Point Arithmetic and ISO/IEC TS 18661.

SEE ALSO

     nearbyint(3), nextafter(3)

COLOPHON

     This  page  is  part of release 4.16 of the Linux man-pages project.  A
     description of the project, information about reporting bugs,  and  the
     latest     version     of     this    page,    can    be    found    at
     https://www.kernel.org/doc/man-pages/.

GNU 2017-09-15 NEXTUP(3)

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