C++ quiz. What value will be assigned to <b>y</b> ? <pre><co

What value will be assigned to y ?

const int x = 5;
int main(int argc, char** argv)
{
    int x[x];
    int y = sizeof(x) / sizeof(int);
    return 0;
}

0
5
20
Undefined

Explanation

In the example above, the int array size is evaluated before local x variable declaration is completed, hence, at the moment of x[] initialization, the global x is not hidden by the local one. Accordingly, sizeof(x) / sizeof(int) evaluates to 5 * sizeof(int) / sizeof(int), hence the result is 5.