sqrt

NAME

sqrt, sqrtf, sqrtl - square root function

#include <math.h>
 I double sqrt(double  x );

I float sqrtf(float  x );

I long double sqrtl(long double  x );

Link with -lm.

The R 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.