题解 | #空心正方形图案#

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 = 1; i <= n; i++) {
            for (int j = 1; j <= n; j++) {
                if ((i == 1) || (i == n) || (j == 1) || (j == n)) {
                    cout << "* ";
                } else {
                    cout << "  ";
                }
            }

            cout << endl;
        }
    }

    return 0;
}

/*
int main() {
    int n;

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


    return 0;
}
*/