题目内容

有关共用体类型数据的特点,下列说法正确的是:

A. 共用体变量所占的内存长度等于最长的成员的长度
B. 共用体变量各成员的地址都是同一地址
C. 对于共用体变量,只能对它的第一个成员赋初值
D. 对于共用体变量,起作用的是最后一次存放的成员

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结构体类型是系统固有的数据类型

A. 对
B. 错

枚举类型是C语言中的基本数据类型

A. 对
B. 错

结构体类型和共用体类型可以相互嵌套定义

A. 对
B. 错

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