#include <iostream>
#include <math.h>
using namespace std;
int main(){
double a,b,c,D,x1,x2;
do
{
cout<<"a= ";
cin>>a;
}while(a==0);
cout<<"b= ";
cin>>b;
cout<<"c= ";
cin>>c;
D=b*b-4*a*c;
if (D>0)
{
x1=(-b+sqrt(D))/2*a;
x2=(-b-sqrt(D))/2*a;
cout<<"x1= "<<x1<<endl<<"x2= "<<x2<<endl;
}
else cout<<"Error!";
system("PAUSE");
return 0;}
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