1SQRT(3)                    Linux Programmer's Manual                   SQRT(3)
2
3
4

NAME

6       sqrt, sqrtf, sqrtl - square root function
7

SYNOPSIS

9       #include <math.h>
10
11       double sqrt(double x);
12       float sqrtf(float x);
13       long double sqrtl(long double x);
14
15       Link with -lm.
16
17   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
18
19       sqrtf(), sqrtl():
20           _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
21               || /* Since glibc 2.19: */ _DEFAULT_SOURCE
22               || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
23

DESCRIPTION

25       These functions return the nonnegative square root of x.
26

RETURN VALUE

28       On success, these functions return the square root of x.
29
30       If x is a NaN, a NaN is returned.
31
32       If x is +0 (-0), +0 (-0) is returned.
33
34       If x is positive infinity, positive infinity is returned.
35
36       If x is less than -0, a domain error occurs, and a NaN is returned.
37

ERRORS

39       See  math_error(7) for information on how to determine whether an error
40       has occurred when calling these functions.
41
42       The following errors can occur:
43
44       Domain error: x less than -0
45              errno is set  to  EDOM.   An  invalid  floating-point  exception
46              (FE_INVALID) is raised.
47

ATTRIBUTES

49       For   an   explanation   of   the  terms  used  in  this  section,  see
50       attributes(7).
51
52       ┌─────────────────────────┬───────────────┬─────────┐
53       │Interface                │ Attribute     │ Value   │
54       ├─────────────────────────┼───────────────┼─────────┤
55       │sqrt(), sqrtf(), sqrtl() │ Thread safety │ MT-Safe │
56       └─────────────────────────┴───────────────┴─────────┘

CONFORMING TO

58       C99, POSIX.1-2001, POSIX.1-2008.
59
60       The variant returning double also conforms to SVr4, 4.3BSD, C89.
61

SEE ALSO

63       cbrt(3), csqrt(3), hypot(3)
64

COLOPHON

66       This page is part of release 4.15 of the Linux  man-pages  project.   A
67       description  of  the project, information about reporting bugs, and the
68       latest    version    of    this    page,    can     be     found     at
69       https://www.kernel.org/doc/man-pages/.
70
71
72
73                                  2017-09-15                           SQRT(3)
Impressum