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.


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++:






// C++ program to demonstrate
// example of sqrt() function.
#include <bits/stdC++.h>
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;



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

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