#include <iostream> using namespace std; int main() {     double x1,x2;     double a, b, c;     cout<<"The quadratic decision\nEnter in one line value of factors and press <Enter>\n";     cin>>a>>b>>c;     if(a==0)     {         cout<<"The equation isn't square";     }     else     {         double d=b*b-4*a*c;         if(d<0)         {             cout<<"The equation has no decision in the valid area";         }         if(d==0)         {             cout<<"The equation has 2 identical roots of the equation:\n";             x1=-b/(2*a);             cout<<"x = "<<x1;         }         if(d>0)         {             cout<<"Equation roots:\n";             d=sqrt(d);             x1=(-b+d)/(2*a);             x2=(-b-d)/(2*a);             cout<<"x1 = "<<x1<<"\n"<<"x2 = "<<x2;         }     }     return 1; }