sqrt(3) - f39

1sqrt(3)                    Library Functions Manual                    sqrt(3)
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NAME

6       sqrt, sqrtf, sqrtl - square root function
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LIBRARY

9       Math library (libm, -lm)
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SYNOPSIS

12       #include <math.h>
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14       double sqrt(double x);
15       float sqrtf(float x);
16       long double sqrtl(long double x);
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18   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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20       sqrtf(), sqrtl():
21           _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
22               || /* Since glibc 2.19: */ _DEFAULT_SOURCE
23               || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
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DESCRIPTION

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

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

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

50       For  an  explanation  of  the  terms  used  in  this  section,  see at‐
51       tributes(7).
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53       ┌────────────────────────────────────────────┬───────────────┬─────────┐
54       │Interface                                   │ Attribute     │ Value   │
55       ├────────────────────────────────────────────┼───────────────┼─────────┤
56       │sqrt(), sqrtf(), sqrtl()                    │ Thread safety │ MT-Safe │
57       └────────────────────────────────────────────┴───────────────┴─────────┘
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STANDARDS

60       C11, POSIX.1-2008.
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HISTORY

63       C99, POSIX.1-2001.
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65       The variant returning double also conforms to SVr4, 4.3BSD, C89.
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