First ever program in C++!

#include <iostream>
#include <cmath>

int main() {
  double a;
  double b;
  double c;

  std::cout << "Enter a: ";
  std::cin >> a;
  std::cout << "Enter b: ";
  std::cin >> b;
  std::cout << "Enter c: ";
  std::cin >> c;

  double root1;
  double root2;

  root1 = (-b + std::sqrt (b*b - 4*a*c)) / (2*a);
  root2 = (-b - std::sqrt (b*b - 4*a*c)) / (2*a);

  std::cout << "Root 1 Is " << root1 << "\n";
  std::cout << "Root 2 Is " << root2 << "\n";
}