大学专业英语Unit_3_Section_A_xiaodan.pptVIP

Programming Language －Classification of High-Level Languages In the execution of such a program, an input statement can be logically deduced from other statements in the program. Many artificial intelligence programs are written in such languages. 在这样一个程序的执行过程中，一条输入语句可以按照逻辑从程序中的其他语句推断出来。许多人工智能程序使用这种语言编写。 Programming Language －Language Structure and Components IV. Language Structure and Components Programming languages use specific types of statements, or instructions, to provide functional structure to the program. A statement in a program is a basic sentence that expresses a simple idea—its purpose is to give the computer a basic instruction. IV. 语言结构与成分 编程语言使用特定类型的语句或指令，来给程序提供功能结构。程序中的一个语句是表达一个简单想法的基本句子——它的目的是给计算机一条基本指令。 Programming Language －Language Structure and Components Statements define the types of data allowed, how data are to be manipulated, and the ways that procedures and functions work. Programmers use statements to manipulate common components of programming languages, such as variables and macros (mini-programs within a program). Macros 宏 mini-programs 小程序 语句定义所允许的数据类型、数据如何处理以及过程和函数的工作方式。程序员使用语句来操控编程语言的常见成分，如变量和宏（程序中的小程序段）。 Programming Language －Language Structure and Components Statements known as data declarations give names and properties to elements of a program called variables. Variables can be assigned different values within the program. Declaration： 声明 property: 财产,特性 Assign 赋予 数据声明语句给称为变量的那些程序元素以名称和属性。变量在程序中可以赋予不同的值. The properties variables can have are called types, and they include such things as what possible values might be saved in the variables, how much numerical accuracy is to be used in the values, and how one variable may represent a collection of simpler values in an organized fashion, such as a table or array. Programming Language －Language Structure and Components a collection of 一组 fashion 方式