C++ :

#include<bits/stdc++.h>

using namespace std;

double a,b,c;

int main()
{
	cin >>a>>b>>c;
	double delta=b*b-4*a*c;
	if(delta<0)
	{
		cout <<"No answer!"<<'\n';
	}
	else if(delta>0)
	{
		double x1=(-b+sqrt(delta))/(2*a);
		double x2=(-b-sqrt(delta))/(2*a);
		printf("x1=%.5lf;x2=%.5lf\n",min(x1,x2),max(x1,x2));
	}
	else
	{
		double x=-b/(2*a);
		printf("x1=x2=%.5lf\n",x);
	}
	
	return 0;
}