|SQRT(3)||Linux Programmer's Manual||SQRT(3)|
double sqrt(double x); float sqrtf(float x); long double sqrtl(long double x);
Link with -lm.
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L || /* Since glibc 2.19: */ _DEFAULT_SOURCE || /* Glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
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.
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.
|sqrt (), sqrtf (), sqrtl ()||Thread safety||MT-Safe|
The variant returning double also conforms to SVr4, 4.3BSD, C89.