Square of stars.

#include<iostream>

using namespace std;
int main() {
    int n;
    cin >> n;
    for (int a = 1; a <= n; a = a + 1) {
        for (int b = 1; b <= n; b = b + 1) {
            if (b == 1 || b == n)
                cout << "*";
            else if (a == 1 || a == n)
                cout << "*";
            else
                cout << " ";
        }
        cout << endl;
    }
        return 0;

}