汇编和高级语言(专业英语西南交大版).ppt

Assembly High-level Languages 组号：2组 姓名：**** 学号：******** 专业：软件工程 专业英语 2015.10.19 content 01 About assembly languages 02 About high-level languages PART ONE About assembly languages About assembly languages What is assembly languages? It is just one language among many programing languages. It develops as the mnemonic operation codes symbolic addresses arise. It can be translated into machine-language used within computers while processing datas. 01 Computer itself begin to assign keep track of instruction addresses instead of human programmers Programmer assign a symbolic name an actual address to a data item People merely specify the first instruction’s location , assembler will automatically allocates locations for instructions data The development of assembly languages 01 They allow programmers to substitute letter symbols for numeric machine’s operation codes 1 2 3 mnemonic operation codes arise Symbolic addressing develops Save time , reduce detail . Fewer errors which can be more easier to find. More easier for people to modify. Some advantages and limitations of assembly languages 01 They are always time consuming advantages limitations They are machine-oriented Sometimes programs have to be recoded for another different machine by using it. PART TWO About high-level languages Why did they been produced? The reason is that people want to speed up coding What are they? They are just one kind of programing languages What else do help its development? About high-level languages 02 the development of mnemonic techniques macroinstructions led Advantages of high-level languages 02 They’re easier to learn than assembly languages They requires less time tp write. They provide better documentation.. They are easier to maintain. They are not restricted to using a single type of machine. THANKS