sqrt


function
<cmath> 
     double sqrt (      double x );
      float sqrt (       float x );
long double sqrt ( long double x );

Compute square root

Returns the square root of x.

In C++, this function is overloaded in <complex> and <valarray> (see complex sqrt and valarray sqrt).

Parameters

x
Floating point value.
If the argument is negative, a domain error occurs, setting the global variable errno to the value EDOM.


Return Value

Square root of x.

Portability

In C, only the double version of this function exists with this name.

Example

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

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


Output:

sqrt(1024.000000) = 32.000000


See also

pow Raise to power (function)
log Compute natural logarithm (function)