hypotl(3)

1HYPOT(3)                   Linux Programmer's Manual                  HYPOT(3)
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NAME

6       hypot, hypotf, hypotl - Euclidean distance function
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SYNOPSIS

9       #include <math.h>
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11       double hypot(double x, double y);
12       float hypotf(float x, float y);
13       long double hypotl(long double x, long double y);
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15       Link with -lm.
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17   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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19       hypot():
20           _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
21               || _XOPEN_SOURCE
22               || /* Since glibc 2.19: */ _DEFAULT_SOURCE
23               || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
24       hypotf(), hypotl():
25           _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
26               || /* Since glibc 2.19: */ _DEFAULT_SOURCE
27               || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
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DESCRIPTION

30       These  functions  return  sqrt(x*x+y*y).  This is the length of the hy‐
31       potenuse of a right-angled triangle with sides of length x  and  y,  or
32       the distance of the point (x,y) from the origin.
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34       The calculation is performed without undue overflow or underflow during
35       the intermediate steps of the calculation.
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RETURN VALUE

38       On success, these functions return the length of the  hypotenuse  of  a
39       right-angled triangle with sides of length x and y.
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41       If x or y is an infinity, positive infinity is returned.
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43       If x or y is a NaN, and the other argument is not an infinity, a NaN is
44       returned.
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46       If the result overflows, a range error occurs, and the functions return
47       HUGE_VAL, HUGE_VALF, or HUGE_VALL, respectively.
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49       If  both  arguments are subnormal, and the result is subnormal, a range
50       error occurs, and the correct result is returned.
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ERRORS

53       See math_error(7) for information on how to determine whether an  error
54       has occurred when calling these functions.
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56       The following errors can occur:
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58       Range error: result overflow
59              errno  is  set  to ERANGE.  An overflow floating-point exception
60              (FE_OVERFLOW) is raised.
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62       Range error: result underflow
63              An underflow floating-point exception (FE_UNDERFLOW) is raised.
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65              These functions do not set errno for this case.
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ATTRIBUTES

68       For an  explanation  of  the  terms  used  in  this  section,  see  at‐
69       tributes(7).
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71       ┌────────────────────────────┬───────────────┬─────────┐
72       │Interface                   │ Attribute     │ Value   │
73       ├────────────────────────────┼───────────────┼─────────┤
74       │hypot(), hypotf(), hypotl() │ Thread safety │ MT-Safe │
75       └────────────────────────────┴───────────────┴─────────┘
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CONFORMING TO

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

86       This  page  is  part of release 5.10 of the Linux man-pages project.  A
87       description of the project, information about reporting bugs,  and  the
88       latest     version     of     this    page,    can    be    found    at
89       https://www.kernel.org/doc/man-pages/.
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93                                  2017-09-15                          HYPOT(3)