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Интерактивная система просмотра системных руководств (man-ов)

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

    NAME

    fegetround, fesetround - get and set current rounding direction
     
    

    SYNOPSIS

    #include <fenv.h>

    int fegetround(void);
    int fesetround(int
    round);
     

    DESCRIPTION

    The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of IEEE Std 1003.1-2001 defers to the ISO C standard.

    The fegetround() function shall get the current rounding direction.

    The fesetround() function shall establish the rounding direction represented by its argument round. If the argument is not equal to the value of a rounding direction macro, the rounding direction is not changed.  

    RETURN VALUE

    The fegetround() function shall return the value of the rounding direction macro representing the current rounding direction or a negative value if there is no such rounding direction macro or the current rounding direction is not determinable.

    The fesetround() function shall return a zero value if and only if the requested rounding direction was established.  

    ERRORS

    No errors are defined.

    The following sections are informative.  

    EXAMPLES

    The following example saves, sets, and restores the rounding direction, reporting an error and aborting if setting the rounding direction fails:

    
    #include <fenv.h>
    #include <assert.h>
    void f(int round_dir)
    {
        #pragma STDC FENV_ACCESS ON
        int save_round;
        int setround_ok;
        save_round = fegetround();
        setround_ok = fesetround(round_dir);
        assert(setround_ok == 0);
        /* ... */
        fesetround(save_round);
        /* ... */
    }
    
    
     

    APPLICATION USAGE

    None.  

    RATIONALE

    None.  

    FUTURE DIRECTIONS

    None.  

    SEE ALSO

    The Base Definitions volume of IEEE Std 1003.1-2001, <fenv.h>  

    COPYRIGHT

    Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    ERRORS
    EXAMPLES
    APPLICATION USAGE
    RATIONALE
    FUTURE DIRECTIONS
    SEE ALSO
    COPYRIGHT


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