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sqrt, sqrtf---positive square root

Synopsis 
#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.


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