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man:truncf

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

NAME

     trunc, truncf, truncl - round to integer, toward zero

SYNOPSIS

     #include <math.h>
     double trunc(double x);
     float truncf(float x);
     long double truncl(long double x);
     Link with -lm.
 Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
     trunc(), truncf(), truncl():
         _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L

DESCRIPTION

     These  functions  round x to the nearest integer not larger in absolute
     value.

RETURN VALUE

     These functions return the rounded integer value.
     If x is integral, infinite, or NaN, x itself is returned.

ERRORS

     No errors occur.

VERSIONS

     These functions first appeared in glibc in version 2.1.

ATTRIBUTES

     For  an  explanation  of  the  terms  used   in   this   section,   see
     attributes(7).
     allbox;  lbw27  lb  lb  l  l  l.  Interface Attribute Value T{ trunc(),
     truncf(), truncl() T}   Thread safety  MT-Safe

CONFORMING TO

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

NOTES

     The integral value returned by these functions  may  be  too  large  to
     store  in  an  integer  type  (int, long, etc.).  To avoid an overflow,
     which will produce undefined results, an application should  perform  a
     range  check  on  the  returned value before assigning it to an integer
     type.

SEE ALSO

     ceil(3), floor(3), lrint(3), nearbyint(3), rint(3), round(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/.
                                2017-09-15                          TRUNC(3)
/data/webs/external/dokuwiki/data/pages/man/truncf.txt · Last modified: 2019/05/17 09:47 by 127.0.0.1

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