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

    NAME

    nextafter, nextafterf, nextafterl, nexttoward, nexttowardf, nexttowardl -
    floating-point number manipulation
     
    

    SYNOPSIS

    #include <math.h>

    double nextafter(double x, double y);
    float nextafterf(float x, float y);
    long double nextafterl(long double x, long double y);

    double nexttoward(double x, long double y);
    float nexttowardf(float x, long double y);
    long double nexttowardl(long double x, long double y);

    Link with -lm.

    Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

    nextafter(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 500 || _ISOC99_SOURCE; or cc -std=c99
    nextafterf(), nextafterl(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE; or cc -std=c99
    nexttoward(), nexttowardf(), nexttowardl(): _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE; cc -std=c99  

    DESCRIPTION

    The nextafter() functions return the next representable floating-point value following x in the direction of y. If y is less than x, these functions will return the largest representable number less than y.

    If x equals y, the functions return y.

    The nexttoward() functions do the same as the nextafter() functions, except that they have a long double second argument.  

    RETURN VALUE

    On success, these functions return the next representable floating-point value after x in the direction of y.

    If x equals y, then y (cast to the same type as x) is returned.

    If x or y is a NaN, a NaN is returned.

    If x is finite, and the result would overflow, a range error occurs, and the functions return HUGE_VAL, HUGE_VALF, or HUGE_VALL, respectively, with the correct mathematical sign.

    If x is not equal to y, and the correct function result would be subnormal, zero, or underflow, a range error occurs, and either the correct value (if it can be represented), or 0.0, is returned.  

    ERRORS

    See math_error(7) for information on how to determine whether an error has occurred when calling these functions.

    The following errors can occur:

    Range error: result overflow
    An overflow floating-point exception (FE_OVERFLOW) is raised.
    Range error: result is subnormal or underflows
    An underflow floating-point exception (FE_UNDERFLOW) is raised.

    These functions do not set errno.  

    CONFORMING TO

    C99, POSIX.1-2001. This function is defined in IEC 559 (and the appendix with recommended functions in IEEE 754/IEEE 854).  

    BUGS

    In glibc version 2.5 and earlier, these functions do not raise an underflow floating-point (FE_UNDERFLOW) exception when an underflow occurs.  

    SEE ALSO

    nearbyint(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
    CONFORMING TO
    BUGS
    SEE ALSO
    COLOPHON


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