#include <iostream>

int main() {
    int west{4};
    int east{7};
    int *selected = &west;
    *selected += 1;
    selected = &east;
    std::cout << "West: " << west << "; selected: " << *selected << '\n';
    selected = nullptr;
    std::cout << "No selection: " << (selected == nullptr) << '\n';
}