Radacinile ecuatiei de gradul II

#include <iostream>
#include <math.h>

using namespace std;

int main() {
    int a, b, c, delta, x1, x2;
    cout << endl;
    cout << "           Calculul ecuatiei de gradul II" << endl << endl << endl;
    cout << " Introduceti coeficientii ecuatiei" << endl << endl;
    cout << " ax^2 + bx + c = 0" << endl << endl;
    cout << " a = "; cin >> a;
    cout << " b = "; cin >> b;
    cout << " c = "; cin >> c;
    delta = b*b - 4 * a * c;
    cout << endl;
    if (delta < 0)
        cout << "Ecuatia nu are solutii reale";
    else {
        cout << " Solutiile ecuatiei sunt:" << endl << endl;
        if (delta == 0) {
            cout << " x1 = x2 = ";
            if (-b / 2 * a == (int)(-b / 2 * a))
                cout << -b / 2 * a;
            else
                cout << -b << "/" << 2 * a;
        }
        else
            if (sqrt(delta) == (int)(sqrt(delta)))
                if ((-b + sqrt(delta)) / 2 * a == (int)((-b + sqrt(delta)) / 2 * a)) {
                    cout << " x1 = " << (-b + sqrt(delta)) / 2 * a << endl;
                    cout << " x2 = " << (-b - sqrt(delta)) / 2 * a;
                }
                else {
                    cout << " x1 = " << -b + sqrt(delta) << "/" << 2 * a << endl;;
                    cout << " x2 = " << -b - sqrt(delta) << "/" << 2 * a;
                }
            else
                if (-b / 2 * a == (int)(-b / 2 * a)) {
                    cout << " x1 = " << -b / 2 * a << " + rad(" << delta << ") / " << 2 * a << endl;
                    cout << " x2 = " << -b / 2 * a << " - rad(" << delta << ") / " << 2 * a;
                }
                else {
                    cout << " x1 = " << b << " + rad(" << delta << ") / " << 2 * a << endl;
                    cout << " x2 = " << b << " - rad(" << delta << ") / " << 2 * a;
                }
    }
    cout << endl << endl;
    cout << ' ';
    system("pause");
    return 0;
}