ООП лаб 3

#include <iostream>
#include <cmath>

#define PI 3.1413

using namespace std;

class formula {
    public:
        double x,
               y,
               z,
               res;
        bool flag;

        void vvod() {
            flag = 0;
            cout << "Enter x = ";
            cin >> x;
            cout << "Enter y = ";
            cin >> y;
            cout << "Enter z = ";
            cin >> z;
        }

        void run() {
            if(((fabs(x - y)) * z + x * x) == 0){
                flag = 1;
                return;
            }

            double acot_x = PI/2. - atan(x);
            res = (5. * acot_x) -
            ((1./4) * acos(x)) *
            ((x + (3. * (fabs(x - y))) + x * x) /
            ((fabs(x - y)) * z + x * x));
        }

        void vivod() {
            if(flag == 1)
                cout << "Error: denominator = 0" << endl;
            else
                cout << "Result = " << res << endl;
        }
};

int main() {

    formula f1;
    f1.vvod();
    f1.run();
    f1.vivod();

    formula *pf2 = new formula;
    pf2->vvod();
    pf2->run();
    pf2->vivod();



    return 0;
}