double ObGaussa(double a, double b, int w, double TabT[], double TabA[])
{
    double wyn = 0;
    for(int i = 0; i < w; i++)
    {
        wyn += TabA[i]*(1/(((b-a)/2)*TabT[i]+((b+a)/2)));
    }
    wyn *= ((b-a)/2);
    return wyn;
}

double W1Gaussa(double a, double b)
{
    double TabT[1];
    double TabA[1];
    TabA[0] = 2;
    TabT[0] = 0;
    return ObGaussa(a, b, 1, TabT, TabA);
}

double W2Gaussa(double a, double b)
{
    double TabT[2];
    double TabA[2];
    TabA[0] = 1;
    TabA[1] = 1;
    TabT[0] = -0.57735;
    TabT[1] = 0.57735;
    return ObGaussa(a, b, 2, TabT, TabA);
}

double W3Gaussa(double a, double b)
{
    double TabT[3];
    double TabA[3];
    TabA[0] = 0.55556;
    TabA[1] = 0.55556;
    TabA[2] = 0.88889;
    TabT[0] = -0.7746;
    TabT[1] = 0.7746;
    TabT[2] = 0;
    return ObGaussa(a, b, 3, TabT, TabA);
}

double W4Gaussa(double a, double b)
{
    double TabT[4];
    double TabA[4];
    TabA[0] = 0.34785;
    TabA[1] = 0.34785;
    TabA[2] = 0.65215;
    TabA[3] = 0.65215;
    TabT[0] = -0.86114;
    TabT[1] = 0.86114;
    TabT[2] = -0.33998;
    TabT[3] = 0.33998;
    return ObGaussa(a, b, 4, TabT, TabA);
}

double W5Gaussa(double a, double b)
{
    double TabT[5];
    double TabA[5];
    TabA[0] = 0.23693;
    TabA[1] = 0.23693;
    TabA[2] = 0.47863;
    TabA[3] = 0.47863;
    TabA[4] = 0.56889;
    TabT[0] = -0.90618;
    TabT[1] = 0.90618;
    TabT[2] = -0.53847;
    TabT[3] = 0.53847;
    TabT[4] = 0;
    return ObGaussa(a, b, 4, TabT, TabA);
}

void Gaussa()
{
    int w;
    double a, b, wyn;
    cout << "Podaj a: ";
    cin >> a;
    cout << "Podaj b: ";
    cin >> b;
    cout << "Podaj w (1 - 5): ";
    cin >> w;
    switch (w)
    {
        case 1 : wyn = W1Gaussa(a, b); break;
        case 2 : wyn = W2Gaussa(a, b); break;
        case 3 : wyn = W3Gaussa(a, b); break;
        case 4 : wyn = W4Gaussa(a, b); break;
        case 5 : wyn = W5Gaussa(a, b); break;
        default : cout << "Brak implementacji powyzej 5 wezlow!" << endl; return; break;
    }
    cout << "Pole: " << wyn << endl;
}