sqrtf---positive square root
#include <math.h> double sqrt(double x); float sqrtf(float x);
sqrt computes the positive square root of the argument.
You can modify error handling for this function with
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).
sqrt is ANSI C.
sqrtf is an extension.
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