Sa se scrie un program care rezolva ecuatia de gradul al II-lea (c++)

#include <iostream>
#include <cmath>
#include <iomanip>
using namespace std;
int main()
{
    float a,b,c,d;
    cin>>a>>b>>c;
    cout<<fixed;
    if(a)
    {
        d=b*b-4*a*c;
        if(d<0)
            cout<<"Nu are solutii reale";
        else if(!d)
        {
            a=(-b)/(2*a);
            cout<<setprecision(2)<<"Radacina dubla "<<a;
        }
        else
        {
            c=(-b+sqrt(d))/(2*a);
            b=(-b-sqrt(d))/(2*a);
            if(c>b)
                cout<<setprecision(2)<<c<<" "<<b;
            else
                cout<<setprecision(2)<<b<<" "<<c;
        }
    }
    else
    {
        if(b)
        {
            a=(-c)/b;
            cout<<setprecision(2)<<"Radacina dubla "<<a;
        }
        else
            cout<<"Nu are solutii reale";
    }
    return 0;
}