结构

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type arrayName [ arraySize ];

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enum DAY//枚举类型 标签
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{
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    MON=1, TUE, WED, THU, FRI, SAT, SUN
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}day;定义名字

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struct tag {
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    member-list
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    member-list
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    member-list
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    ...
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} variable-list ;

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union [union tag]
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{
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   member definition;
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   member definition;
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   ...
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   member definition;
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} [one or more union variables];