sqrt, sqrtf—positive square root #include <math.h>
double sqrt(double x);
float sqrtf(float x);
Description
sqrt computes the positive square root of the argument.
You can modify error handling for this function with
matherr.
Returns
On success, the square root is returned. If x is real and
positive, then the result is positive. If x is real and
negative, the global value errno is set to EDOM (domain error).
Portability
sqrt is ANSI C. sqrtf is an extension.