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SQRT(3) Linux Programmer's Manual SQRT(3)[top]NAMEsqrt, sqrtf, sqrtl - square root functionSYNOPSIS#include <math.h> double sqrt(double x); float sqrtf(float x); long double sqrtl(long double x); Link withFeature 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-lm.DESCRIPTIONThe sqrt() function returns the nonnegative square root of x.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, a domain error occurs, and a NaN is returned.-0ERRORSSee 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 thanerrno is set to EDOM. An invalid floating-point exception (FE_INVALID) is raised.-0CONFORMING TOC99, POSIX.1-2001. The variant returning double also conforms to SVr4, 4.3BSD, C89.SEE ALSOcbrt(3), csqrt(3), hypot(3)COLOPHONThis page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. 2010-09-20 SQRT(3)

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