题解 | #箭形图案#

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 + 1; i++) {
            for (int j = n + 1 - i; j >= 1; j--) {
                cout << "  ";
            }

            for (int k = 1; k <= i; k++) {
                cout << "*";
            }

            cout << endl;
        }

        for (int i = n; i >= 1; i--) {
            for (int j = 0; j <= n - i; j++) {
                cout << "  ";
            }

            for (int k = i; k >= 1; k--) {
                cout << "*";
            }

            cout << endl;
        }
    }

    return 0;
}