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#include<iostream>#include<math.h>#include<string>using namespace std;void main(){	string konec;do	{	 float a,b,c;	 double long d,x1,x2,x;  	 cout<<"a=";	 cin>>a;	 cout<<"b=";	 cin>>b;	 cout<<"c=";	 cin>>c;	 d=((b*b)-(4*a*c));	 if(a!=0&&b==0&&c==0)	 cout<<"x=0"<<endl;	 if(a==0&&b==0&&c==0)		 cout<<"mnozestvo resheniy"<<endl;		 if(a==0&&b!=0&&c!=0)		{			 x=-c/b;			 cout<<"x="<<x<<endl;		}	 if(a!=0&&b==0&&c!=0)		{					 if(a>0&&c>0||a<0&&c<0)		 			cout<<"x1="<<x1<<" "<<"x2="<<x2<<endl;			cout<<"oshibka, vvedite znachenia zanovo"<<endl;			continue;		}	     else		{			x1=sqrt(-c/a);			x2=-sqrt(-c/a);			cout<<"x1="<<x1<<" "<<"x2="<<x2<<endl;		}	 if(a!=0&&b!=0&&c==0)		{			x2=-b/a;			cout<<"x1=0 "<<"x2="<<x2<<endl;		}	 if(a!=0&&b!=0&&c!=0&&d<0)         						cout<<"net korney"<<endl;				 if(a!=0&&b!=0&&c!=0&&d==0)			{				x=(-b*0.5)/(2*a);				cout<<"x="<<x<<endl;			}					 if(a!=0&&b!=0&&c!=0&&d>0)						{				x1=((-b/2)+sqrt(d))/(2*a);				x2=((-b/2)-sqrt(d))/(2*a);				cout<<"x1="<<x1<<" x2="<<x2<<endl;			}		 cout<<"restart program?(y/n) ";	 cin>>konec;	}while(konec=="y");		}