数据（ Data ) ：描述事物的符号记录称为数据。数据的种类有数字、文字、图形、图像、声音、正文等。数据与其语义是不可分的。解析在现代计算机系统中数据的概念是广义的。早期的计算机系统主要用于科学计算，处理的数据是整数、实数、浮点数等传统数学中的数据。现代计算机能存储和处理的对象十分广泛，表示这些对象的数据也越来越复杂。数据与其语义是不可分的。 500 这个数字可以表示一件物品的价格是 500 元，也可以表示一个学术会议参加的人数有 500 人，还可以表示-Data (Data): descr iption of the data record is called the symbol of things. The types of digital data, text, graphics, images, sounds, text and so on. Data and its semantics are inseparable. Analysis of data in modern computer systems is a broad concept. Early computer systems mainly used for scientific computing, processing of the data is an integer, real, floating point data in traditional mathematics. Modern computers can store and process a wide range of objects, these objects of the data that has become increasingly complex. Data and its semantics are inseparable. 500 This number can be the price of an item that is 500 yuan, you can also attend an academic conference that the number of 500 people, but also can be expressed