sqrt

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():

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).

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

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Referenced By

cbrt(3), exp(3), exp10(3), exp2(3), ffmpeg-all(1), ffmpeg-filters(1), ffplay-all(1), ffprobe-all(1), glutSolidDodecahedron(3), glutWireDodecahedron(3), gmx-editconf(1), hypot(3), log(3), log10(3), log2(3), pow(3).

The man pages sqrtf(3) and sqrtl(3) are aliases of sqrt(3).