Giáo trình tổng hợp các cách sử dụng máy in laser một cách hiệu quả và tiết kiệm phần 7 pps

- Ads:

 Easy to write

 Easy to understand

 Known the processing data in CPU

 Prog writing is shortset

- Dis:

 Must be complier

 The time of running prog is longer than machine language

3. High level language

- HLL was developed in order to further easy the work of programmers by

making the programming language more procedure oriented

- Features:

 The statements of HLL are closer to natural english or other

natural language

 A HLL source program must be translated into machine

code by means of a compiler or an interpreter

- Ads:

 Easy to wirte

 Easy to understand

 May be used for everybody

 Closed to natural languages english language

- Dis:

 Must be interpreter by compiler or an interpreter before

processing by the computer

 The prog is long

 The time to run the prog is longer than low level language

Question 2. Some High Level Languages (HLL)?

1. COBOL: Common Business Oriented Language

- COBOL is an exetensively used HLL and since around 1960 several

versions have appeared

- The original intention was that COBOL should be capable of being

compiled and run on any model of computer

- COBOL is now employed for many business data processing applications,

and so a brief explaination of its structure follows

- A COBOL program consists of 4 divisions:

 Identifycation division this identifies the prog

 Enviroment division specifies the computer to be used for

compiling and processing

 Data division specifies the format and relates to these to the

names used in the procedure division

 Procedure division comprises the statements in the source

program, this is the main part of a COBOL program

2. BASIC: Beginners ALL purpose Symbolic Instruction Code

- BASIC is a straightforward HLL intended for use in a time-sharing

environment in this respect it is particularly beneficial in educational

institutions

- One of the difficulties with BASIC is the welter of dialects currently in use

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