KvadratnaC++

#include <iostream>
#include <cmath>

using namespace std;

int main()
{
    float a,b,c,D,x1r,x1i,x2r,x2i;

    cout<<"unesite koeficijete a,b,c:"<<endl;
    cin>>a>>b>>c;

    D = b*b - 4*a*c;

    if (D >= 0) {
        x1r = (-b+sqrt(D))/(2*a);
        x2r = (-b-sqrt(D))/(2*a);

        cout<<"Rjesenja jednacine su realna"<<endl;
        cout<<"x1 = "<<x1r<<endl;
        cout<<"x2 = "<<x2r<<endl;
    }
    else {
        x1r = -b/(2*a);
        x1i = sqrt(-D)/(2*a);

        x2r = -b/(2*a);
        x2i = -sqrt(-D)/(2*a);


        cout<<"Rjesenja jednacine su iracionalna"<<endl;
        cout<<"x1r = "<<x1r<<"     x1i = "<<x1i<<"i"<<endl;
        cout<<"x2r = "<<x2r<<"     x2i = "<<x2i<<"i"<<endl;
    }
    return 0;
}