CentOS 5.2

GNU/Linux	CentOS 5.2
	sqrtf(3)

SQRT

NAME

sqrt, sqrtf, sqrtl − square root function

#include <math.h>

double sqrt(double x);
float sqrtf(float x);
long double sqrtl(long double x);

Link with −lm.

The sqrt() function returns the non-negative square root of x. It fails and sets errno to EDOM, if x is negative.

EDOM

x is negative.

SVr4, 4.3BSD, C89. The float and long double variants are C99 requirements.