SQRT(3) - man page online | library functions

Square root function.

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

NAME sqrt, sqrtf, sqrtl - square root function
SYNOPSIS #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 These functions return the nonnegative square root of x.
RETURN VALUE 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 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.
ATTRIBUTES For an explanation of the terms used in this section, see attributes(7). ┌─────────────────────────┬───────────────┬─────────┐ │Interface │ Attribute │ Value │ ├─────────────────────────┼───────────────┼─────────┤ │sqrt(), sqrtf(), sqrtl() │ Thread safety │ MT-Safe │ └─────────────────────────┴───────────────┴─────────┘
CONFORMING TO C99, POSIX.1-2001, POSIX.1-2008. The variant returning double also conforms to SVr4, 4.3BSD, C89.
SEE ALSO cbrt(3), csqrt(3), hypot(3)
COLOPHON This page is part of release 4.04 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
2015-04-19 SQRT(3)
This manual Reference Other manuals
sqrt(3) referred by aribas(1) | bigint(3perl) | bignum(3perl) | bigrat(3perl) | cbrt(3) | exp(3) | exp10(3) | exp2(3) | gmx-editconf(1) | hypot(3) | log(3) | log10(3) | log2(3) | Math::BigInt(3perl) | Math::BigInt(3pm) | Math::NumSeq::PlanePathCoord(3pm) | Math::NumSeq::PlanePathDelta(3pm) | Math::PlanePath(3pm) | Math::PlanePath::CubicBase(3pm) | Math::PlanePath::DragonCurve(3pm)
refer to attributes(7) | cbrt(3) | csqrt(3) | feature_test_macros(7) | hypot(3) | math_error(7)