#include

#include

using namespace std;

class QEquation{

double a,b,c;

public:

QEquation(double x=1, double y=0, double z=-1){

a=x; b=y; c=z;

}

void set_coef(double x, double y, double z){

a=x; b=y; c=z;

}

void solve_equation(){

double d,x1,x2;

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

if(d>0){

d=sqrt(d);

x1=(-b+d)/(2*a);

x2=(-b-d)/(2*a);

cout

}else if(d==0){

x1=-b/(2*a);

cout

}else

cout

}

};

int main(){

QEquation e1,e2(2,4,8),e3;

e3.set_coef(1,4,4);

e1.solve_equation();

e2.solve_equation();

e3.solve_equation();

return 0;

}