JuniorTheoryOccasional

What does the program print?

C++

#include <iostream>

int kind(int x) {
    if (x > 0)
        if (x > 10)
            return 2;
    else
        return -1;
    return 1;
}

int main() { std::cout << kind(5) << ' ' << kind(-5); }

-1 1

Expecting 1 -1, as the indentation suggests: an else belongs to the nearest if without an else, here if (x > 10), and indentation changes nothing.
Expecting a compile error: the nearest-if rule leaves no ambiguity, so Clang and GCC only warn and suggest braces.

How would you place braces in kind so that it returns -1 for every x <= 0?
Which compiler warning flags an ambiguous else, and what fix does it suggest?

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JuniorTheoryOccasional

What does the program print?

C++

#include <iostream>

int kind(int x) {
    if (x > 0)
        if (x > 10)
            return 2;
    else
        return -1;
    return 1;
}

int main() { std::cout << kind(5) << ' ' << kind(-5); }

-1 1

Expecting 1 -1, as the indentation suggests: an else belongs to the nearest if without an else, here if (x > 10), and indentation changes nothing.
Expecting a compile error: the nearest-if rule leaves no ambiguity, so Clang and GCC only warn and suggest braces.

How would you place braces in kind so that it returns -1 for every x <= 0?
Which compiler warning flags an ambiguous else, and what fix does it suggest?

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