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trunc (3)
  • trunc (3) ( Solaris man: Библиотечные вызовы )
  • trunc (3) ( FreeBSD man: Библиотечные вызовы )
  • trunc (3) ( Русские man: Библиотечные вызовы )
  • >> trunc (3) ( Linux man: Библиотечные вызовы )
  • trunc (3) ( POSIX man: Библиотечные вызовы )
  •  

    NAME

    trunc, truncf, truncl - round to integer, towards 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(): _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE; or cc -std=c99  

    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.  

    CONFORMING TO

    C99, POSIX.1-2001.  

    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 3.14 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/.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    ERRORS
    VERSIONS
    CONFORMING TO
    NOTES
    SEE ALSO
    COLOPHON


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