JuniorTheoryCommon

What does the program print?

C++

#include <iostream>

int main() {
    int level = 1;
    {
        int level = 2;
        std::cout << level << ' ';
    }
    std::cout << level << '\n';
}

2 1

Expecting 2 2: int level = 2; declares a new variable that lives only until the closing brace; the outer level is never changed and keeps 1.
Expecting a compile error: a name cannot be declared twice in one block, but an inner block may declare it again and hide the outer one.

What would the program print if the inner line were level = 2; instead?
How does the compiler warning flag -Wshadow help you catch a hidden variable?

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JuniorTheoryCommon

What does the program print?

C++

#include <iostream>

int main() {
    int level = 1;
    {
        int level = 2;
        std::cout << level << ' ';
    }
    std::cout << level << '\n';
}

2 1

Expecting 2 2: int level = 2; declares a new variable that lives only until the closing brace; the outer level is never changed and keeps 1.
Expecting a compile error: a name cannot be declared twice in one block, but an inner block may declare it again and hide the outer one.

What would the program print if the inner line were level = 2; instead?
How does the compiler warning flag -Wshadow help you catch a hidden variable?

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