Chapter13 - Discovering Computers 2009 Chapter 13...

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Discovering Computers 2009 Chapter 13 Programming Languages and Program
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Chapter 13 Objectives Next Describe various ways to develop Web pages including HTML, scripting languages, DHTML, XML, WML, and Web page authoring software Differentiate between machine and assembly languages Identify and discuss the purpose of procedural programming languages Identify and discuss the characteristics of object-oriented programming languages and program development tools Identify the uses of other programming languages and other program development tools Identify the uses of popular multimedia authoring programs List the six steps in the program development cycle Differentiate between structured design and object-oriented design Explain the basic control structures and design tools used in designing solutions to programming problems
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Computer Programs and Programming Languages What is a computer program ? p. 664 Fig. 13-1 Next Ø Series of instructions that directs computer to perform tasks § Programming language —used to communicate instructions
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Computer Programs and Programming Languages What are low-level languages and high-level languages? p. 664 - 665 Next High-level language Low-level language Machine-dependent runs only on one type of computer Often machine-independent can run on many different types of computers and operating systems Machine and assembly languages are low-level
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Low-Level Languages What is machine language ? p. 665 Fig. 13-2 Next Ø Only language computer directly recognizes Ø Uses a series of binary digits (1s and 0s) with a combination of numbers and letters that represent binary digits
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Low-Level Languages What is assembly language ? p. 666 Fig. 13-3 Next Ø Instructions made up of symbolic instruction codes, meaningful abbreviations and codes Ø Source program contains code to be converted to machine language
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Often called third-generation language (3GL) Procedural Languages What is a procedural language ? p. 666 Next Uses series of English-like words to write instructions Programmer writes instructions that tell computer what to accomplish and how to do it
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Procedural Languages What is a compiler? p. 667 Fig. 13-4 Next Ø Program that converts entire source program into machine language before executing it
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Procedural Languages What is an interpreter? p. 667 Fig. 13-5 Next Ø Program that translates and executes one program code statement at a time Ø Does not produce object program
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Procedural Languages What is COBOL ? p. 668 Fig. 13-6 Next Ø Designed for business applications Ø English-like statements make code easy to read, write, and maintain Ø Common Business-Oriented Language Click to view Web Link, click Chapter 13, Click Web Link from left navigation, then click COBOL below Chapter 13
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Procedural Languages What is C ?
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