Каково качество кода С++

#include

#include

#include

using std::cout;

using std::cin;

using std::endl;

int main()

{

setlocale(LC_ALL, "Russian");

int a, b, c, d;

cout << "Введите первое число: " << endl;

cin >> a;

cout << "Введите второе число: " << endl;

cin >> b;

cout << "Введите третье число: " << endl;

cin >> c;

double x1, x2;

d = (b*b) - 4 * (a * c);

x1 = (-b + sqrt(d)) / (2 * a);

x2 = (-b - sqrt(d)) / (2 * a);

cout << "(" << b << "^2)- 4* " << a << "*" << c << "=" << d << endl;

cout << "x1 = (" << b << "+" << sqrt(d) << ")/(2*" << a << ")=" << x1 << endl;

cout << "x2 = (" << b << "-" << sqrt(d) << ")/(2*" << a << ")=" << x2 << endl;

if (d > 0)

cout << "Два корня: x1 = : " << x1 << ", x2 = " << x2;

else

if (d = 0)

cout << "Один корень: x1 = " << x1;

else

if (d < 0)

cout << "Корней нет";

_getch();

return 0;

}