知识点:

循环控制:

循环输出图形

#include <iostream>
using namespace std;

int main() {
    int n;

    while (cin >> n) {
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < n; j++) {
                if ((i == j) || (j == n - i - 1)) {
                    cout << "*";
                } else {
                    cout << " ";
                }
            }
            cout << endl;
        }
    }

    return 0;
}