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Question #161 Difficulty: 3

According to the C++17 standard, what is the output of this program? 

    #include <iostream>

int main() {
    int n = 3;
    int i = 0;

    switch (n % 2) {
    case 0: 
    do {
    ++i;
    case 1: ++i;
    } while (--n > 0);
    }

    std::cout << i;
}

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