JuniorTheoryCommon

What does the program print?

C++

#include <iostream>

struct Note {
    Note(char c) { std::cout << c; }
};
struct Pair {
    Note first;
    Note second;
    Pair() : second('2'), first('1') { std::cout << '3'; }
};

int main() { Pair p; }

123

Expecting 213: fields are initialized in the order they are declared in the class, not in the order the initializer list names them.
Expecting 312: every field is initialized before the constructor body starts, so the body prints 3 last.

What goes wrong if one field's initializer reads a field declared below it?
In what order are first and second destroyed when p goes out of scope?

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Back to questions

JuniorTheoryCommon

What does the program print?

C++

#include <iostream>

struct Note {
    Note(char c) { std::cout << c; }
};
struct Pair {
    Note first;
    Note second;
    Pair() : second('2'), first('1') { std::cout << '3'; }
};

int main() { Pair p; }

123

Expecting 213: fields are initialized in the order they are declared in the class, not in the order the initializer list names them.
Expecting 312: every field is initialized before the constructor body starts, so the body prints 3 last.

What goes wrong if one field's initializer reads a field declared below it?
In what order are first and second destroyed when p goes out of scope?

Back to questions Open topic in roadmap →Answer it yourself — Quiz