Find roots of a quadratic equation in C++

#include <iostream>
#include <cmath>
using namespace std;
int main()
{
    float a,b,c,x1,x2,discriminant,realPart,imaginaryPart;
    cout<<"Enter coefficients a, b and c : ";
    cin>>a>>b>>c;
    discriminant=b*b-4*a*c;
    if (discriminant>0)
    {
        x1=(-b+sqrt(discriminant))/(2*a);
        x2=(-b-sqrt(discriminant))/(2*a);
        cout<<"Roots are real and different."<<endl;
        cout<<"x1 = "<<x1<<endl;
        cout<<"x2 = "<<x2<<endl;
    }
    else if (discriminant==0)
    {
        cout<<"Roots are real and same."<<endl;
        x1=-b/(2*a);
        cout<<"x1 = x2 ="<<x1<<endl;
    }
    else
    {
        realPart=-b/(2*a);
        imaginaryPart=sqrt(-discriminant)/(2*a);
        cout<<"Roots are complex and different."<<endl;
        cout<<"x1 = "<<realPart<<"+"<<imaginaryPart<<"i"<<endl;
        cout<<"x2 = "<<realPart<<"-"<<imaginaryPart<<"i"<<endl;
    }
}