本文摘自《C++ Primer》第三页的内容，解释了数据类型如何定义数据元素的内容及可能的操作。变量用于存储程序中操作的数据，每个变量都有其特定的类型。当变量v的类型为T时，我们可以说v具有类型T或v是一个T。
《C++ Primer》p.3
"A type defines both the contents of a data element and the operations that are possible on those data."
"The data our programs manipulate are stored in variables and every variable has a type. When the type of a variable named v is T, we often say that "v has type T" or, interchangeably, that "v is a T"."
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