#include <iostream>

void print_if_present(int* p) {
    if (p == nullptr) {
        std::cout << "missing" << '\n';
        return;
    }
    std::cout << *p << '\n';
}

int main() {
    int value{6};
    print_if_present(&value);
    print_if_present(nullptr);
    return 0;
}