URI -1036 with C++

#include<iostream>
#include<cmath>
using namespace std;
int main()
{
double a,b,c,r1,r2,d;
cin>>a>>b>>c;
d=(pow(b,2)-(4*a*c));
r1=(-b+sqrt(d))/(2*a);
r2=(-b-sqrt(d))/(2*a);
cout.precision(5);
if(a!=0 && d>0)
{
    cout<<fixed<<"R1 = "<<r1<<endl;
    cout<<fixed<<"R2 = "<<r2<<endl;
}
else{
    cout<<"Impossivel calcular\n";
}

return 0;
}