Как изменить тип данных на абстрактный?

#include <iostream>
#include <cstdlib>
using namespace std;
 
double *getSequence(int n) {
    double *sequence = new double[n + 1];
 
    for (int i = 0; i < n; i++) {
        cout << "Enter A" << (i + 1) << ": ";
        cin >> sequence[i];
 
        while (i > 0 && sequence[i] < sequence[i - 1]) {
            cout << "Incorrect input. Try again: ";
            cin >> sequence[i];
        }
    }
 
    return sequence;
}
 
void printSequence(double *sequence, int n) {
    cout << "Sequence: ";
 
    for (int i = 0; i < n - 1; i++)
        cout << sequence[i] << ", ";
 
    cout << sequence[n - 1] << std::endl;
}
 
void insertB(double *sequence, int &n, double b) {
    int i = 0;
 
    while (i < n && sequence[i] < b)
        i++;
 
    for (int j = n; j > i; j--)
        sequence[j] = sequence[j - 1];
 
    sequence[i] = b;
    n++;
}
 
int main() {
    int n;
 
    cout << "Enter n: ";
    cin >> n;
 
    double *sequence = getSequence(n); 
    printSequence(sequence, n); 
 
    double b;
    cout << "Enter b: ";
    cin >> b; 
 
    insertB(sequence, n, b); 
    printSequence(sequence, n); 
 
    system("pause"); 
    return 0;
}

class Abstract {
    public:         
        virtual void print()=0; 
};