# sqrt() function for complex number in C++

The complex version of sqrt() function is defined in the complex header file. This function is used to calculate the square root of the complex number z with a branch cut along the negative real axis.

Syntax:

```template <class T> complex<T>
sqrt(const complex<T>& z);
```

Parameters: This method takes a mandaory parameter z which represents the complex number whose square root is to be calculated.

Return Value: This function returns the square root of the complex number z.

Below program illustrate the sqrt() function for complex number in C++:

Example:-

 `// C++ program to demonstrate ` `// example of sqrt() function. ` ` `  `#include ` `using` `namespace` `std; ` ` `  `int` `main() ` `{ ` `    ``cout << ``"Square root of -9 is ="``; ` `    ``cout << ``sqrt``(complex<``double``>(-9, 0)) ` `         ``<< endl; ` ` `  `    ``cout << ``"Square root of (-9, -0), is = "``; ` `    ``cout << ``sqrt``(complex<``double``>(-9, -0.0)) ` `         ``<< endl; ` ` `  `    ``return` `0; ` `} `

Output:

```Square root of -9 is =(0,3)
Square root of (-9, -0) is = (0,-3)
```

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