C语言枚举数据类型？

Question

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Answer 1

此语句来自C99 6.7.2.2p4

Each enumerated type shall be compatible with char, a signed integer type, or an unsigned integer type. The choice of type is implementation-defined,¹⁰⁸) but shall be capable of representing the values of all the members of the enumeration.

108) An implementation may delay the choice of which integer type until all enumeration constants have been seen.

这允许编译器做出它认为是特定枚举的最佳选择。枚举可能不是在机器之间传递的二进制消息中使用的最佳选择。但是，您可以使用整数类型，然后转换回枚举类型。