sqrtl(3) - f38

1sqrt(3)                    Library Functions Manual                    sqrt(3)
2
3
4

NAME

6       sqrt, sqrtf, sqrtl - square root function
7

LIBRARY

9       Math library (libm, -lm)
10

SYNOPSIS

12       #include <math.h>
13
14       double sqrt(double x);
15       float sqrtf(float x);
16       long double sqrtl(long double x);
17
18   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
19
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
24

DESCRIPTION

26       These functions return the nonnegative square root of x.
27

RETURN VALUE

29       On success, these functions return the square root of x.
30
31       If x is a NaN, a NaN is returned.
32
33       If x is +0 (-0), +0 (-0) is returned.
34
35       If x is positive infinity, positive infinity is returned.
36
37       If x is less than -0, a domain error occurs, and a NaN is returned.
38

ERRORS

40       See  math_error(7) for information on how to determine whether an error
41       has occurred when calling these functions.
42
43       The following errors can occur:
44
45       Domain error: x less than -0
46              errno is set  to  EDOM.   An  invalid  floating-point  exception
47              (FE_INVALID) is raised.
48

ATTRIBUTES

50       For  an  explanation  of  the  terms  used  in  this  section,  see at‐
51       tributes(7).
52
53       ┌────────────────────────────────────────────┬───────────────┬─────────┐
54       │Interface                                   │ Attribute     │ Value   │
55       ├────────────────────────────────────────────┼───────────────┼─────────┤
56       │sqrt(), sqrtf(), sqrtl()                    │ Thread safety │ MT-Safe │
57       └────────────────────────────────────────────┴───────────────┴─────────┘
58

STANDARDS

60       C11, POSIX.1-2008.
61

HISTORY

63       C99, POSIX.1-2001.
64
65       The variant returning double also conforms to SVr4, 4.3BSD, C89.
66