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

    NAME

    hypot, hypotf, hypotl - Euclidean distance function
     
    

    SYNOPSIS

    #include <math.h>
    
    double hypot(double x, double y);
    
    float hypotf(float x, float y);
    long double hypotl(long double x, long double y);

    Link with -lm.

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

    hypot(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE || _ISOC99_SOURCE; or cc -std=c99
    hypotf(), hypotl(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE; or cc -std=c99  

    DESCRIPTION

    The hypot() function returns sqrt(x*x+y*y). This is the length of the hypotenuse of a right-angled triangle with sides of length x and y, or the distance of the point (x,y) from the origin.

    The calculation is performed without undue overflow or underflow during the intermediate steps of the calculation.  

    RETURN VALUE

    On success, these functions return the length of a right-angled triangle with sides of length x and y.

    If x or y is an infinity, positive infinity is returned.

    If x or y is a NaN, and the other argument is not an infinity, a NaN is returned.

    If the result overflows, a range error occurs, and the functions return HUGE_VAL, HUGE_VALF, or HUGE_VALL, respectively.

    If both arguments are subnormal, and the result is subnormal, a range error occurs, and the correct result 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
    errno is set to ERANGE. An overflow floating-point exception (FE_OVERFLOW) is raised.
    Range error: result underflow
    An underflow floating-point exception (FE_UNDERFLOW) is raised.
    These functions do not set errno for this case.
     

    CONFORMING TO

    C99, POSIX.1-2001. The variant returning double also conforms to SVr4, 4.3BSD.  

    SEE ALSO

    cabs(3), sqrt(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
    SEE ALSO
    COLOPHON


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