Ecuación 2º Grado en C

[Intael]

#include <iostream>
#include <cmath>
using namespace std;
int main ()
{
cout. setf ( ios :: fixed );
cout. precision (4);
double a,b,c,d,e,x1,x2;
cin>>a>>b>>c;
a<0 or a>0;
d=-b+(sqrt((b*b)-(4*a*c)));
e=-b-(sqrt((b*b)-(4*a*c)));
x1=d/(2*a);
x2=e/(2*a);
if (x1==x2) {cout<<x1<<endl;}
if (x1>x2) {cout<<x2<<" "<<x1<<endl;}
if (x1<x2) {cout<<x1<<" "<<x2<<endl;}
if ((b*b)-(4*(a*c))<0) {cout<<"sense solucio"<<endl;}
}