C++的基本变量类型🦝

[next-mdx-remote] error compiling MDX: Unexpected character `<` (U+003C) before name, expected a character that can start a name, such as a letter, `$`, or `_` 84 | | is>>s | 输入 | | 85 | | s.empty() | 判断是否为空 | | > 86 | | os << s | 输出 | | | ^ 87 | | s.size() | 获取大小 | 返回值是string::size_type类型 | 88 | | s1+s2 | 合并字符串 | | More information: https://mdxjs.com/docs/troubleshooting-mdx