#include <iostream>
#include <cmath>

int main() {
  
float a,b,c;

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

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

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

float root1, 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";
}

g++ hello.cpp
./a.out