NAME  SYNOPSIS  DESCRIPTION  RETURN VALUE  ERRORS  CONFORMING TO  SEE ALSO  COLOPHON 

SQRT(3) Linux Programmer's Manual SQRT(3)
sqrt, sqrtf, sqrtl  square root function
#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
The sqrt() function returns the nonnegative square root of x.
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.
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 floatingpoint exception (FE_INVALID) is raised.
C99, POSIX.12001. The variant returning double also conforms to SVr4, 4.3BSD, C89.
cbrt(3), csqrt(3), hypot(3)
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20100920 SQRT(3)
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