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1. In this statement, which parts can use the variable n? ``

cpp
if (int n = 12; n > 10) {
    cout << "big\n";
} else {
    cout << "small\n";
}

``

Anywhere in main after the declarationOnly in the if test, the if body and the else partOnly in the if body, not in the testAnywhere in the file, since n is a global

2. Why does this statement fail to compile? ``

cpp
map<string, int> stock = {{"apple", 4}};
if (auto it = stock.find("apple")) {
    cout << "found\n";
}

``

find returns a string, not an iteratorThe variable it must be declared before the ifAn iterator cannot be converted to bool, so it cannot be the whole testThe semicolon is missing after auto it

3. What does this program print? ``

cpp
#include <iostream>
using namespace std;

int main() {
    int x = 5;
    if (int x = 0; x > 0) {
        cout << "then x=" << x;
    } else {
        cout << "else x=" << x;
    }
    cout << " outer x=" << x << endl;
}

``

else x=0 outer x=5then x=0 outer x=5else x=5 outer x=5else x=0 outer x=0

4. What does this program print? ``

cpp
#include <iostream>
using namespace std;

int main() {
    cout << "steps:";
    for (int i = 0; i < 4; ++i) {
        if (int step = i * 3; step % 2 == 0) {
            cout << " " << step;
        }
    }
    cout << endl;
}

``

steps: 0 3 6 9steps: 3 9steps: 0 2steps: 0 6

5. The if (setup; test) form is a C++17 feature. Write the lowest -std value that compiles it with no warning, as the flag is spelled after the equals sign (for example c++14).

Type your answer.

Pattern matching and initialisers