Quiz: C++ Introduction

5 questionsNo time limitPass: 60%+10 XP on first pass

What C++ adds to C, your first program, cin and cout, namespaces, the string class, auto and range-based for loops — with every program compiled and checked.

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Question 1

What does this print?

#include <iostream>
using namespace std;
int main() {
    cout << 7 / 2 << " " << 7 / 2.0;
    return 0;
}

3.5 3.53 3.53 34 3.5

Question 2
Which reads a full line including spaces into a string s?
cin >> s;getline(cin, s);scanf("%s", s);cin.get(s);

Question 3

What does this print?

#include <iostream>
#include <string>
using namespace std;
int main() {
    string s = "placement";
    cout << s.substr(2, 4);
    return 0;
}

laceacemplaccement

Question 4
In which namespace do cout and string live?
stdiocppglobal
Question 5
What does for (auto& x : v) x *= 2; do?
NothingDoubles every element of v in placeCreates a new doubled vectorCauses a compile error