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Showing content from https://cplusplus.com/reference/cmath/sqrt/ below:

function

sqrt

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

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

     double sqrt (double x);      float sqrt (float x);long double sqrt (long double x);     double sqrt (T x);           // additional overloads for integral types

Compute square root

Returns the square root of x.

Header

<tgmath.h>

provides a type-generic macro version of this function.

Parameters

x: Value whose square root is computed.
If the argument is negative, a domain error occurs.

Return Value Square root of x.
If x is negative, a domain error occurs:

If a

domain error

occurs, the global variable

errno

is set to

EDOM

Example

/* sqrt example */
#include <stdio.h>      /* printf */
#include <math.h>       /* sqrt */

int main ()
{
  double param, result;
  param = 1024.0;
  result = sqrt (param);
  printf ("sqrt(%f) = %f\n", param, result );
  return 0;
}

Output:

sqrt(1024.000000) = 32.000000