[变量数据类型](%E5%8F%98%E9%87%8F%E6%95%B0%E6%8D%AE%E7%B1%BB%E5%9E%8B.md) [枚举类型enum(常量集合)](%E6%9E%9A%E4%B8%BE%E7%B1%BB%E5%9E%8B.md) [结构类型struct（结构体）](%E7%BB%93%E6%9E%84%E7%B1%BB%E5%9E%8B.md) [元组类型](%E5%85%83%E7%BB%84%E7%B1%BB%E5%9E%8B.md) [可null类型(T?)](%E5%8F%AFnull%E7%B1%BB%E5%9E%8B.md)