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

6       sqrt, sqrtf, sqrtl - square root function
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SYNOPSIS

9       #include <math.h>
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11       double sqrt(double x);
12       float sqrtf(float x);
13       long double sqrtl(long double x);
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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       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
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DESCRIPTION

25       These functions return the nonnegative square root of x.
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RETURN VALUE

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

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

49       For   an   explanation   of   the  terms  used  in  this  section,  see
50       attributes(7).
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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.
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60       The variant returning double also conforms to SVr4, 4.3BSD, C89.
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SEE ALSO

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

66       This page is part of release 4.16 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/.
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73                                  2017-09-15                           SQRT(3)
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