[Resolved] Is there a better way?

[The Hobo]

I just spent forever finding a way to do this:

#include <iostream>
using namespace std;

double *incArray(double *arr);

int main() {
    double *vars;

    for (int i = 0; i < 4; i++) {
        vars = incArray(vars);

        vars[i] = i;
        cout << vars[i] << endl;
    }
    
    cout << endl << "After: " << endl << endl;

    for (i = 0; i < 4; i++) {
        cout << vars[i] << endl;
    }

    return 0;
}

double *incArray(double *arr) {
    
    double *arrtemp = arr;

    arr = new double[sizeof(arr)];

    for (int i = 0; i < sizeof(arrtemp); i++) {
        arr[i] = arrtemp[i];
    }

    return arr;

}

Is that good or is there a better way?