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sqrt() function for complex number in C++

  • Last Updated : 30 Oct, 2020

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.


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

Parameters: This method takes a mandatory 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 <math.h>
#include <iostream>
#include <complex>
using namespace std;
int main()
    cout << "Square root of -9 is ";
    cout << sqrt(complex<double>(-9.0, 0.0)) << endl;
    cout << "Square root of (-9, -0) is ";
    cout << sqrt(complex<double>(-9.0, -0.0)) << endl;
    return 0;
Square root of -9 is (0,3)
Square root of (-9, -0) is (0,-3)
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