NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | SEE ALSO | COLOPHON

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

NAME         top

       sqrt, sqrtf, sqrtl - square root function

SYNOPSIS         top

       #include <math.h>

       double sqrt(double x);
       float sqrtf(float x);
       long double sqrtl(long double x);

       Link with -lm.

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       sqrtf(), sqrtl():
           _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 ||
           _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
           or cc -std=c99

DESCRIPTION         top

       The sqrt() function returns the nonnegative square root of x.

RETURN VALUE         top

       On success, these functions return the square root of x.

       If x is a NaN, a NaN is returned.

       If x is +0 (-0), +0 (-0) is returned.

       If x is positive infinity, positive infinity is returned.

       If x is less than -0, a domain error occurs, and a NaN is returned.

ERRORS         top

       See math_error(7) for information on how to determine whether an
       error has occurred when calling these functions.

       The following errors can occur:

       Domain error: x less than -0
              errno is set to EDOM.  An invalid floating-point exception
              (FE_INVALID) is raised.

CONFORMING TO         top

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

SEE ALSO         top

       cbrt(3), csqrt(3), hypot(3)

COLOPHON         top

       This page is part of release 3.75 of the Linux man-pages project.  A
       description of the project, information about reporting bugs, and the
       latest version of this page, can be found at
       http://www.kernel.org/doc/man-pages/.

                                 2010-09-20                          SQRT(3)