问一下这个怎么用for循环解

Question

Answer 1

#include <iostream>
using namespace std;
int main()
{
    // 上半三角
    for (int i = 1; i <= 7; i++){
        if(i%2==1){
            // 空格
            for (int j = 1; j <=i; j++){
                cout << "#";
            } 
            cout << endl;
        }else{
            for (int k = 1; k <=i; k++){
                cout << "+";
            }
            cout << endl;
        }        
    }
    // 下半三角
    for (int i = 6; i >0; i--){
        if(i%2==1){
            // 空格
            for (int j = 1; j <=i; j++){
                cout << "#";
            } 
            cout << endl;
        }else{
            for (int k = 1; k <=i; k++){
                cout << "+";
            }
            cout << endl;
        }        
    }
    system("pause");
    return 0;
}

```