StateMachin空间巨细即是doubl数据类型的巨细

一个union只配置一个满足大的空间以来容纳最大长度的数据成员。最大长度是doubl型态，以上例而言

union保护满足的空间来置放多个数据成员中的一种”而不是为每一个数据成员配置空间，

union 维护足够的空间来置放多个数据成员中的“一种”，而不是为每一个数据成员配置空间，

在union 中所有的数据成员共用一个空间，同一时间只能储存其中一个数据成员，

所有的数据成员具有相同的起始地址。

union StateMachine
{
 

 char character;
   int number;
   char *str;
   double exp;
};

一个union 只配置一个足够大的空间以来容纳最大长度的数据成员

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