sqrtf(3)

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(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600
20       || _ISOC99_SOURCE; or cc -std=c99
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DESCRIPTION

23       The sqrt() function returns the non-negative square root of x.
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RETURN VALUE

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

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

47       C99, POSIX.1-2001.  The variant returning double also conforms to SVr4,
48       4.3BSD, C89.
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COLOPHON

54       This  page  is  part of release 3.22 of the Linux man-pages project.  A
55       description of the project, and information about reporting  bugs,  can
56       be found at http://www.kernel.org/doc/man-pages/.
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60                                  2008-08-05                           SQRT(3)