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HYPOT(3) Linux Programmer's Manual HYPOT(3)


     hypot, hypotf, hypotl - Euclidean distance function


     #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)):
         _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
             || _XOPEN_SOURCE
             || /* Since glibc 2.19: */ _DEFAULT_SOURCE
             || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
     hypotf(), hypotl():
         _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
             || /* Since glibc 2.19: */ _DEFAULT_SOURCE
             || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE


     These  functions  return  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.


     On success, these functions return the length of a right-angled  trian-
     gle 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
     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.


     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.


     For   an   explanation   of   the  terms  used  in  this  section,  see
     |Interface                   | Attribute     | Value   |
     |hypot(), hypotf(), hypotl() | Thread safety | MT-Safe |


     C99, POSIX.1-2001, POSIX.1-2008.
     The variant returning double also conforms to SVr4, 4.3BSD.


     cabs(3), sqrt(3)


     This  page  is  part of release 4.16 of the Linux man-pages project.  A
     description of the project, information about reporting bugs,  and  the
     latest     version     of     this    page,    can    be    found    at
                                2017-09-15                          HYPOT(3)
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