Use polar to create complex number : complex number « Data Types « C++ Tutorial

1. C++ Tutorial
2. Data Types
3. complex number

#include <complex>
#include <iostream>

using namespace std;

int main( )  {
  double rho = 3.0; // magnitude
  double theta = 3.141592 / 2; // angle
  complex<double> coord = polar(rho, theta);
  cout << "rho = " << abs(coord) << ", theta = " << arg(coord) << endl;
  coord += polar(4.0, 0.0);
  cout << "rho = " << abs(coord) << ", theta = " << arg(coord) << endl;
}

rho = 3, theta = 1.5708
rho = 5, theta = 0.643501