#include <iostream>
using namespace std;

class VectorDouble {
private:
    double* array;
    int max_count;
    int count;
public:
    VectorDouble() {
        max_count = 50;

        array = (double*)malloc(max_count * sizeof(double));

        count = 0;
    }

    VectorDouble(VectorDouble& v) {
        max_count = v.size();
        array = (double*)malloc(max_count * sizeof(double));

        for (int i = 0; i < max_count; i++) {
            array[i] = v.value_at(i);
        }
        count = max_count;
    }

    int size() {
        return count;
    }

    void push_back(double d) {
        if (count == max_count) {
            max_count *= 2;
            double* newarr = (double*)malloc(max_count * sizeof(double));

            for (int i = 0; i < count; i++) {
                newarr[i] = array[i];
            }

            delete array;
            array = newarr;
        }
        array[count++] = d;
    }

    void change_value_at(double d, int i) {
        array[i] = d;
    }

    double value_at(int i) {
        return array[i];
    }

    void resize(int num) {
        if (num == max_count) {
            count = max_count;
            return;
        }

        double* newArray = (double*)malloc(num * sizeof(double));
        int temp = (count < num) ? count : num;

        for (int i = 0; i < temp; i++) {
            newArray[i] = array[i];
        }

        delete array;
        array = newArray;
        count = num;
    }

    void reserve(int num) {
        if (num <= max_count) return;
        max_count = num;
        double* newarr = (double*)malloc(max_count * sizeof(double));

        for (int i = 0; i < count; i++) {
            newarr[i] = array[i];
        }

        delete array;
        array = newarr;
    }
};

int main() {
    VectorDouble v;
    v.push_back(4.7);
    v.push_back(1992.4);
    v.push_back(842);
    v.push_back(.11);

    VectorDouble v2;

    for (int i = 0; i < 76; i++) { //Creating an array that is larger than max count to display it can still handle it by resizing
        v2.push_back(i);
    }

    cout << "Size of v is: " << v.size() << endl;
    cout << "Size of v2 is: " << v2.size() << endl;
    cout << "V = ";

    for (int i = 0; i < v.size(); i++) { //Printing contents of v
        cout << v.value_at(i) << " ";
    }

    cout << endl;

    v.change_value_at(56.1, 1); //Changing a value

    for (int i = 0; i < v.size(); i++) { //Printing contents of v
        cout << v.value_at(i) << " ";
    }

    cout << endl;

    return 0;
}