c++空心倒直角三角

要输出一个空心倒直角三角形，可以使用嵌套循环和条件语句来实现。以下是一个示例代码：

#include <iostream>
using namespace std;

int main() {
    int n;
    cin >> n;
    
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= i; j++) {
            if (j == 1 || j == i || i == n) {
                cout << "*";
            } else {
                cout << " ";
            }
        }
        cout << endl;
    }
    
    return 0;
}

这段代码会根据用户输入的n的值输出相应层数的空心倒直角三角形。在每一行的循环中，我们使用条件语句判断当前位置是否需要输出"*"或者空格。如果是三角形的边界或者最后一行，则输出"*"；否则输出空格。这样就能够实现空心的效果。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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