#include <iostream>
#include <math.h>
using namespace std;
int main()
{
double a, b, c, x1, x2, d;
do{
cout << "Input a: ";
cin >> a;
if (a == 0) {
cout << "Error! a = 0! This isn't a square equation! Try again" << endl;
}
} while (a == 0);
cout << "Input b: ";
cin >> b;
cout << "Input c: ";
cin >> c;
d = b * b - 4. * a * c;
if (d < 0) {
cout << "No roots";
return 1;
}
else if (d == 0) {
cout << "x = " << -b / 2. / a;
return 2;
}
else {
cout << "x1 = " << (-b + sqrt(d)) / 2. / a << ", x2 = " << (-b - sqrt(d)) / 2. / a;
return 0;
}
}
