NAME

sqrt — square root function

SYNOPSIS

#include <math.h>

double
sqrt(double x);

long double
sqrtl(long double x);

float
sqrtf(float x);

DESCRIPTION

The sqrt() function compute the non-negative square root of x.

SPECIAL VALUES

sqrt(-0) returns -0.

sqrt(x) returns a NaN and generates a domain error for x < 0.

VECTOR OPERATIONS

If you need to apply the sqrt() function to SIMD vectors or arrays, using the following functions provided by the Accelerate.framework may give significantly better performance:

#include <Accelerate/Accelerate.h>

vFloat vsqrtf(vFloat x);
vFloat vrsqrtf(vFloat x);
void vvsqrtf(float *y, const float *x, const int *n);
void vvsqrt(double *y, const double *x, const int *n);
void vvrsqrtf(float *y, const float *x, const int *n);
void vvrsqrt(double *y, const double *x, const int *n);

SEE ALSO

math(3)

STANDARDS

The sqrt() function conforms to ISO/IEC 9899:2011.