C++ :

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