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1. What does this program print? ``

cpp
#include <iostream>

int score = 10;

void add_bonus(int bonus) {
    int score = 0;
    score = score + bonus;
    std::cout << "local: " << score << '\n';
}

int main() {
    add_bonus(3);
    add_bonus(4);
    std::cout << "global: " << score << '\n';
}

``

local: 3 local: 7 global: 10local: 0 local: 0 global: 10local: 3 local: 4 global: 10local: 3 local: 4 global: 0

2. What does this program print? ``

cpp
#include <iostream>

int main() {
    for (int n = 1; n <= 2; n++) {
        for (int n = 5; n <= 6; n++) {
            std::cout << n << ',';
        }
        std::cout << '\n';
    }
}

``

1,2, 1,2,5,6, 5,6,1,2, 5,6,5,6,5,6,

3. What does this program print? ``

cpp
#include <iostream>

int tickets() {
    static int last = 100;
    last = last + 2;
    return last;
}

int plain() {
    int last = 100;
    last = last + 2;
    return last;
}

int main() {
    std::cout << tickets() << ' ' << tickets() << ' ' << plain() << ' ' << plain() << '\n';
}

``

102 104 104 104102 102 102 102100 102 100 102102 104 102 102

4. What does this program print? ``

cpp
#include <iostream>

void walk(int n) {
    static int visits = 0;
    visits = visits + 1;
    std::cout << visits << ':' << n << '\n';
    if (n > 0) {
        walk(n - 1);
    }
}

int main() {
    walk(1);
    walk(0);
}

``

1:1 2:0 3:01:1 2:1 3:01:1 1:0 1:01:1 2:0 2:0

5. Which compiler flag makes g++ warn when an inner name hides an outer name?

-O2-Wall-std=c++20-Wshadow

Shadowing and statics