A29790.圣诞树

解题思路
考察 endl 的相关知识点，可以分为 7 行依次输出

代码

#include <bits/stdc++.h>
using namespace std;

int main(){
    cout << "   *   " << endl;
    cout << "  ***  " << endl;
    cout << " ***** " << endl;
    cout << "*******" << endl;
    cout << "   *   " << endl; 
    cout << "   *   " << endl;
    cout << "   *   " << endl;
    return 0;
}