#include <iostream>

using namespace std;

void ExtendArray(int * & ary, size_t & size, size_t grow);
void PrintArray(const int ary[], size_t size);
void Double(int ary[], size_t size);

int main() {
    int * ary{nullptr};
    size_t size{10};
    size_t i;

    ary = new int[size];

    for(i = 0; i < size; i++) {
       ary[i] = static_cast<int>(i);
    }

    PrintArray(ary, size);

    Double(ary, size);
    PrintArray(ary, size);

    ExtendArray(ary,size, 10);
    PrintArray(ary, size);

    Double(ary, size);
    PrintArray(ary, size);

    delete [] ary;

    return 0;

}

void PrintArray(const int ary[], size_t size){
    size_t i;
    bool first{true};

    for(i = 0; i < size; i++) {
        if (first) {
           first = false;
        } else {
           cout << ", ";
        }
        cout << ary[i];
    }
    cout << endl;
    return;
}

void Double(int ary[], size_t size){
    size_t i;

    for(i = 0; i < size; i++) {
        ary[i] *= 2;
    }
    return;
}

void ExtendArray(int * & ary, size_t & size, size_t grow){
    int * tmp{nullptr};
    size_t i;

    tmp = new int[size+grow];
    for(i =0; i < size; i++) {
       tmp[i] = ary[i];
    }

    for(i = size; i < size+grow; i++) {
       tmp[i] = static_cast<int>(i);
    }

    size = size+grow;

    delete [] ary;
    ary = tmp;

    return;
}