sqrt, sqrtf, sqrtl - Square root

Definition	#include <math.h> double sqrt(double x); float sqrtf(float x); (C11) long double sqrtl(long double x); (C11) These functions calculate the square root of a non-negative floating-point number x.
Return val.	sqrt(x)	if x is >= 0.
	0	if x is negative. In addition, errno is set to EDOM (domain error, i.e. invalid argument).
Example	The following program calculates the square root of an input value x. #include <math.h> #include <stdio.h> int main(void) { double x; scanf("%lf", &x); printf("Square root of %g : %g\n", x, sqrt(x)); printf("%d\n", errno); return 0; }
See also	exp, pow, log, log10, hypot, sinh