# include
# include
void main(void)

void main(void)
{
double a,b,c,x1,x2;
cout<<"input a,b,c:";
cin>>a>>b>>c;
double s=b*b-4*a*c;
if(s>=o)

{
double sqrtVal=sqrt(s);
x1=(-b+sqrtVal)/(2*a);
x2=(-b-sqrtVal)/(2*a);
cout<<"x1="<cout<<"x2="<}

else
cout<<"this question does not hava a real answer"<
}