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1. This program does not compile. Which statement explains the error? ``

cpp
struct Score {
    int points;
    int get() { return points; }
};

int show(const Score& s) {
    return s.get();
}

``

Score needs a constructor that takes an intget() is not marked const, so it cannot be called through the const Score& parametershow must take Score by value, because a const& cannot be used with a structget() must return void when it only reads points

2. This program does not compile. What is the bug? ``

cpp
#include <iostream>

template <typename... Values>
auto total(Values... values) {
    return (... + values);
}

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

``

The return type must be int, not autocout cannot print a parameter pack, so the call needs a loopThe fold has no starting value, so the empty call total() fails; write (0 + ... + values)The pack must be declared as const Values&...

3. Predict the output of this program. ``

cpp
#include <iostream>

template <typename... Values>
auto product(Values... values) {
    return (1 * ... * values);
}

int main() {
    std::cout << product(2, 3, 4) << ' ' << product() << '\n';
}

``

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4. Predict the output of this program. ``

cpp
#include <iostream>

struct Box {
    int v;
    inline static int copies = 0;
    Box(int x) : v(x) {}
    Box(const Box& o) : v(o.v) { ++copies; }
};

void by_value(Box b) { b.v += 1; }
void by_ref(const Box& b) { (void)b; }

int main() {
    Box a(5);
    by_value(a);
    by_ref(a);
    by_value(a);
    std::cout << Box::copies << ' ' << a.v << '\n';
}

``

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5. Write the fold expression from the lesson that adds a starting value of 0 to every item in a pack named values. Type it exactly as it appears in code.

Type your answer.

Parameters