#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n;
    cin>>n;
    for(int i=0;i<n;i++)
    {
        cout<<"|";
        for(int j=0;j<n-2;j++)
        {
            if(i==0||i==n-1||i==n/2)
            {
                cout<<"-";
            }
            else
            {
                cout<<"x";
            }
        }
        cout<<"|\n";
    }
}

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;
}