sqrt - Online Linux Manual PageSection : 3
Updated : 2023-02-05
Source : Linux man-pages 6.03

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NAMEsqrt, sqrtf, sqrtl − square root function

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LIBRARYMath library (libm, −lm)

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SYNOPSIS#include <math.h>double sqrt(double x); float sqrtf(float x); long double sqrtl(long double x);Feature Test Macro Requirements for glibc (see feature_test_macros(7)): sqrtf(), sqrtl(): _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L || /* Since glibc 2.19: */ _DEFAULT_SOURCE || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

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DESCRIPTIONThese functions return the nonnegative square root of x.

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RETURN VALUEOn 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.

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ERRORSSee 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.

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ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7). InterfaceAttributeValue sqrt(), sqrtf(), sqrtl() Thread safetyMT-Safe

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STANDARDSC99, POSIX.1-2001, POSIX.1-2008. The variant returning double also conforms to SVr4, 4.3BSD.

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SEE ALSOcbrt(3), csqrt(3), hypot(3) 0

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