python/TangDou/Output/O9.cpp

#include <bits/stdc++.h>

using namespace std;

int main() {
    //如果要求输入的是9行，那么n=(9+1)/2=5
    int i, j, n = 5;
    for (i = 1; i <= n; i++) {
        for (j = 1; j <= (n - i); j++) cout << " ";
        for (j = 1; j <= (2 * (i - 1) + 1); j++) cout << "*";
        cout << endl;
    }
    for (i = n - 1; i >= 1; i--) {
        for (j = 1; j <= (n - i); j++) cout << " ";
        for (j = 1; j <= (2 * (i - 1) + 1); j++) cout << "*";
        cout << endl;
    }
    cout << endl;
    return 0;
}