4semlab4 (C++) Hudyakov's LAB

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

using namespace std;

class Container {
protected:
    vector <int> mas;
public:
    virtual void sort() = 0;
    virtual void foreach() = 0;
    virtual void print() = 0;
};

class Bubble : public Container {
public:
    Bubble() {
        mas.clear();
    }
    Bubble(int n) {
        cout << "Enter massiv: ";
        int temp = 0;
        for (int i = 0; i < n; i++) {
            cin >> temp;
            mas.push_back(temp);
        }
        cout << endl;
    }
    ~Bubble() {
        mas.clear();
    }
    void sort() {
        for (int i = mas.size() - 1; i >= 0; i--) {
            for (int j = 0; j < i; j++) {
                if (mas[j] > mas[j+1]) {
                    int temp = mas[j];
                    mas[j] = mas[j + 1];
                    mas[j + 1] = temp;
                }
            }
        }
    }
    void foreach() {
        for (int i = 0; i < mas.size(); i++) {
            mas[i] = (int)sqrt(mas[i]);
        }
    }
    void print() {
        for (int i = 0; i < mas.size(); i++) {
            cout << mas[i] << ' ';
        }
        cout << endl;
    }
};

class Choice : public Container {
public:
    Choice() {
        mas.clear();
    }
    Choice(int n) {
        cout << "Enter the second massive: ";
        int temp = 0;
        for (int i = 0; i < n; i++) {
            cin >> temp;
            mas.push_back(temp);
        }
        cout << endl;
    }
    ~Choice() {
        mas.clear();
    }
    void sort() {
        for (int i = 0; i < mas.size() - 1; i++) {
            int min_i = i;
            for (int j = i + 1; j < mas.size(); j++) {
                if (mas[j] < mas[min_i]) {
                    min_i = j;
                }
            }
            int temp = mas[i];
            mas[i] = mas[min_i];
            mas[min_i] = temp;
        }
    }
    void foreach() {
        for (int i = 0; i < mas.size(); i++) {
            mas[i] = (int)log(mas[i]);
        }
    }
    void print() {
        for (int i = 0; i < mas.size(); i++) {
            cout << mas[i] << ' ';
        }
        cout << endl;
    }
};

int main() {
    setlocale(LC_ALL, "Russian");
    int n;
    cout << "Vvedite razmernost' massiva: ";
    cin >> n;
    label : Choice c(n);
    Bubble b(n);
    char choice;
    cout << "Vvedite s kakim massivom rabotat'(1 - pervii, 2 - vtoroi): ";
    cin >> choice;
    if (choice == '1') {
        c.sort();
        c.print();
        c.foreach();
        c.print();
    } else if (choice == '2') {
        b.sort();
        c.print();
        b.foreach();
        b.print();
    } else {
        char choice_final;
        cout << "Enter the final solution(Exit or Not): ";
        cin >> choice_final;
        if (choice_final == 'n') {
            goto label;
        } else {
            system("pause");
            return 0;
        }
    }
}