void printf(char*, ...);

int fibonacci(int n) {
    if (n < 2)
        return 1;
    return fibonacci(n - 1) + fibonacci(n - 2);
}

void change_first(char otus[5]) {
    otus[0] = 115;
}

struct Otus {
    int field
};

int main() {
    char text[29] = "10th fibonacci number is %d!";
    printf(text, fibonacci(10));

    char somelist[5] = { 1, 2, 3, 4, 5 };

    change_first(somelist);

    printf(" first element: %d!", somelist[0]);

    struct Otus otus = { 5 };

    printf(" first field: %d!", otus.field);

    return 0;
}