// C++ program to find roots of 
// a quadratic equation 
#include <bits/stdc++.h>
using namespace std;
  
// Prints roots of quadratic equation 
// ax*2 + bx + x
void findRoots(int a, int b, int c)
{
    // If a is 0, then equation is 
    // not quadratic, but linear
    if (a == 0) 
    {
        cout << "Invalid";
        return;
    }
  
    int d = b * b - 4 * a * c;
    double sqrt_val = sqrt(abs(d));
  
    if (d > 0) 
    {
        cout << "Roots are real and different ";
        cout << (double)(-b + sqrt_val) / (2 * a) << 
                 "" << (double)(-b - sqrt_val) / (2 * a);
    }
    else if (d == 0) 
    {
        cout << "Roots are real and same ";
        cout << -(double)b / (2 * a);
    }
    else // d < 0
    {
        cout << "Roots are complex ";
        cout << -(double)b / (2 * a) << 
                " + i" << sqrt_val / (2 * a) << 
                "" << -(double)b / (2 * a) << 
                " - i" << sqrt_val / (2 * a) ;
    }
}
  
// Driver code
int main()
{
    int a = 1, b = -7, c = 12;
    
    // Function call
    findRoots(a, b, c);
    return 0;
}  

Roots are real and different 
4.000000
3.000000