docs(cpp): 补充循环练习参考答案 - #177
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Charliechen114514 merged 2 commits intoAug 30, 2026
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可以看看这些反馈的问题，然后再考虑一下呢？
| return 1; | ||
| } | ||
| std::cout << "2" << "到" << n << "之间所有的素数: " << std::endl; | ||
| for (int flag = 0, i = 2; i <= n; i++) |
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可以看到这里，您写的flag实际上有一些冗余，其实最合适的办法，还是请把flag作为一个独立的布尔变量放到外侧（是这样的，以笔者工作为例子，除非是很老的陈旧代码会不规范的使用int作为布尔类型），我当时一看到这里的时候脑子蒙了一下，建议这里优化一下写法哈
| int main() | ||
| { | ||
| int n = 0; | ||
| long long sum = 1; |
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这个地方小小的捉个虫，叫factorial最合适
Charliechen114514
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提交类型
修改说明
为循环章节补充练习题参考答案，帮助读者从题目要求过渡到完整、可运行的 C++ 实现。
同时修正空心正方形示例输出中的字符间距，使题目描述与参考答案输出保持一致。
具体修改
修改文件：
documents/vol1-fundamentals/ch02/02-loops.md新增以下练习的参考答案：
打印空心正方形
for循环遍历行列continue跳过内部空白位置计算阶乘
long long保存计算结果for循环完成累乘查找素数
break提前退出打印菱形
影响范围
验证方式
g++ -std=c++17 -Wall -Wextra -pedantic编译5运行验证已知情况
本地 VitePress 构建在既有英文编译章节失败，原因是缺少：
documents/en/compilation/compilation-linking-2-reuse-concept/static_library.png该问题与本 PR 修改内容无关。
git diff --check报告示例输出代码块中的少量行尾空格，这些空格用于保持图案输出的宽度。