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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

    c99 [ flag... ] file... -lm [ library... ]
    #include <fenv.h>
    
    int fegetround(void);
    

    int fesetround(int round);
    

     

    DESCRIPTION

    The fegetround function gets the current rounding direction.

    The fesetround function establishes 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 VALUES

    The fegetround function returns 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 returns a 0 value if and only if the requested rounding direction was established.  

    ERRORS

    No errors are defined.  

    EXAMPLES

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

    Example 1 Save, set, and restore the rounding direction.

    #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);
         /* ... */
    }
    

     

    ATTRIBUTES

    See attributes(5) for descriptions of the following attributes:

    ATTRIBUTE TYPEATTRIBUTE VALUE

    Interface StabilityStandard

    MT-Level

     

    SEE ALSO

    fenv.h(3HEAD), attributes(5), standards(5)


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    ERRORS
    EXAMPLES
    ATTRIBUTES
    SEE ALSO


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