The Equation of Degree 2

#include "stdafx.h"
#include "stdlib.h"
#include <iostream>
#include <math.h>

using namespace std;
#define COEFICIENTI 3

void Culoare_Consola();
float Delta_Ecuatie(float v[]);

float v[COEFICIENTI], delta, x1, x2;

int main() {

    char repeta;

    Culoare_Consola();
    do {
        cout << endl;
        cout << " Introduceti coeficientii: " << endl;

        for (int i = 1; i <= COEFICIENTI; i++) {
            if (i == 1) {
                cout << "a="; cin >> v[i];
            }
            else if (i == 2) {
                cout << "b="; cin >> v[i];
            }
            else if (i == 3) {
                cout << "c="; cin >> v[i];
            }
        }

        delta = Delta_Ecuatie(v);
        cout << endl;

        if (delta < 0) {
            cout << " (!)(!) Ecuatia nu are radacini reale! \n";
        }
        else if (delta == 0) {
            cout << " (!) X1 = X2:  \n";
            x1 = -v[2] / 2 * v[1];
            x1 = x2;
            cout << " x1 = x2 = " << x1 << endl;
        }
        else if (delta > 0) {
            cout << " (!) Ecuatia are doua solutii reale! \n";
            x1 = (-v[2] + sqrt(delta)) / 2 * v[1];
            x2 = (-v[2] - sqrt(delta)) / 2 * v[1];
            cout << " x1 = " << x1 << ", x2 = " << x2 << endl;
        }
        cout << " Mai vrei odata? (D/N)  "; cin >> repeta;
    } while (repeta == 'D' || repeta == 'd');

    system("pause");
    return 0;
}

float Delta_Ecuatie(float v[]) {
    float delta;

    delta = v[2] * v[2] - 4 * v[1] * v[3];

    return delta;
}

void Culoare_Consola() {
    system("COLOR 03");
}