typedef struct 联合 域表示

typedef struct 联合 域表示的是在C语言中使用typedef定义一个结构体，并在结构体内部定义一个联合体。联合体内部的不同成员共享同一块内存空间，每次只能存储其中一个成员的值。这样可以节省内存空间，并且能够方便地访问不同类型的数据。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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