Premier IT Outsourcing and Support Services within the UK

User Tools

Site Tools


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


     lround,  lroundf, lroundl, llround, llroundf, llroundl - round to near-
     est integer


     #include <math.h>
     long int lround(double x);
     long int lroundf(float x);
     long int lroundl(long double x);
     long long int llround(double x);
     long long int llroundf(float x);
     long long int llroundl(long double x);
     Link with -lm.
 Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
     All functions shown above:
         _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L


     These functions round their argument  to  the  nearest  integer  value,
     rounding halfway cases away from zero, regardless of the current round-
     ing direction (see fenv(3)).
     Note that unlike the round(3) and ceil(3), functions, the  return  type
     of these functions differs from that of their arguments.


     These functions return the rounded integer value.
     If  x  is a NaN or an infinity, or the rounded value is too large to be
     stored in a long (long long in the case of the ll* functions),  then  a
     domain error occurs, and the return value is unspecified.


     See  math_error(7) for information on how to determine whether an error
     has occurred when calling these functions.
     The following errors can occur:
     Domain error: x is a NaN or infinite, or the rounded value is too large
            An invalid floating-point exception (FE_INVALID) is raised.
     These functions do not set errno.


     These functions first appeared in glibc in version 2.1.


     For  an  explanation  of  the  terms  used   in   this   section,   see
     allbox;  lbw33  lb  lb  l  l l.  Interface Attribute Value T{ lround(),
     lroundf(), lroundl(),
     llround(), llroundf(), llroundl() T}   Thread safety  MT-Safe


     C99, POSIX.1-2001, POSIX.1-2008.


     ceil(3), floor(3), lrint(3), nearbyint(3), rint(3), round(3)


     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
                                2017-09-15                         LROUND(3)
/data/webs/external/dokuwiki/data/pages/man/lroundl.txt · Last modified: 2019/05/17 09:47 by

Donate Powered by PHP Valid HTML5 Valid CSS Driven by DokuWiki