C++ :

#include <iostream>
using namespace std;
int main() {
int n;
cin >> n;
for (int i = 0; i < n; ++i) {
for (int j = 0; j < n; ++j) {
char ch;
if (j == 0 || j == n - 1) {
ch = '|';
} else if (i == 0 || i == n - 1 || i == n / 2) {
ch = '-';
} else {
ch = 'x';
}
cout << ch;
}
cout << endl;
}
return 0;
}