sqrt

INTERFACE

#include <math.h>

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

#include <complex.h>
complex sqrt(complex x)
double complex csqrt(double complex x)
float complex csqrtf(float complex x)
long double complex csqrtl(long double complex x)

DESCRIPTION

The sqrt function computes the non-negative square root of x, i.e.

sqrt(x)$=\sqrt x$

For complex numbers x, sqrt returns the complex root of x, using the following formula

where $\mathrm{arg}(x)$ is the argument of x.

#include <stdio.h>
#include <math.h>
int main()
{
  double x = 1234321;
  double result = sqrt(x);
  printf("The square root of %.2lf is %.2lf\n", x, result);
  return 0;
}

The square root of 1234321.00 is 1111.00

SPECIAL VALUES

sqrt ( -0 ) returns -0.

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

STANDARDS

The sqrt function conforms to ISO/IEC 9899:1999(E).

COMPATIBILITY