1 . 变量声明
one way in which member declarationsand ordinary declarationsare the same is that if a class has multiple data members with the same type , these members can be named in a singledeclaration .如果一个类具有多个同一类型的数据成员,则这些成员可以在一个成员声明中指定,这种情况下,成员声明和普通变量声明是相同的。
2 . 宣告类型
宣告子集declaration type宣告类型declarations宣告declarator