### C++

function
<cmath> <ctgmath>

# sqrt

double sqrt (double x);
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.
This function is overloaded in <complex> and <valarray> (see complex sqrt and valarray sqrt).
Additional overloads are provided in this header (<cmath>) for the integral types: These overloads effectively cast x to a double before calculations (defined for T being any integral type).

This function is also overloaded in <complex> and <valarray> (see complex sqrt and valarray sqrt).

### 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.
If a domain error occurs:
- And math_errhandling has MATH_ERRNO set: the global variable errno is set to EDOM.
- And math_errhandling has MATH_ERREXCEPT set: FE_INVALID is raised.

### Example

 123456789101112 /* sqrt example */ #include /* printf */ #include /* 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