DOC PREVIEW
GSU CSC 2320 - Chapter 1

This preview shows page 1-2-14-15-29-30 out of 30 pages.

Save
View full document
View full document
Premium Document
Do you want full access? Go Premium and unlock all 30 pages.
Access to all documents
Download any document
Ad free experience
View full document
Premium Document
Do you want full access? Go Premium and unlock all 30 pages.
Access to all documents
Download any document
Ad free experience
View full document
Premium Document
Do you want full access? Go Premium and unlock all 30 pages.
Access to all documents
Download any document
Ad free experience
View full document
Premium Document
Do you want full access? Go Premium and unlock all 30 pages.
Access to all documents
Download any document
Ad free experience
View full document
Premium Document
Do you want full access? Go Premium and unlock all 30 pages.
Access to all documents
Download any document
Ad free experience
View full document
Premium Document
Do you want full access? Go Premium and unlock all 30 pages.
Access to all documents
Download any document
Ad free experience
Premium Document
Do you want full access? Go Premium and unlock all 30 pages.
Access to all documents
Download any document
Ad free experience

Unformatted text preview:

Chapter 1 Software DevelopmentSoftware DevelopmentSlide 3Software Development PhasesSoftware Development ModelWaterfall ModelRealistic Waterfall ModelSlide 8Problem Analysis and SpecificationTask ExampleTask AnalysisSlide 12DesignTop-down designOne level partitionTwo level partitionThree level partitionOOD:Object-Oriented DesignProgram=Algorithm + Data StructureAlgorithmsSlide 21CodingSlide 23Testing, Execution, and DebuggingDifferent Kinds Of Tests RequiredThe "V" Life Cycle ModelTwo major types of testingSlide 28Slide 29MaintenanceChapter 1 Software DevelopmentDr. Bernard Chen Ph.D.University of Central ArkansasFall 2008Software DevelopmentHardware: actual physical components (such as CPU, memory, hard drive…)Software: refers to programs used to control the operation of the hardware.Software DevelopmentSoftware development is a complex process that is both an art and a scienceIt is an art in that it requires a good deal of imagination, creativity, and ingenuityIt is also a science that it uses certain standard techniques and methodologiesSoftware Development PhasesProblem Analysis and SpecificationDesignCodingTesting, Execution, and DebuggingMaintenanceSoftware Development ModelOne of the earliest strategies for development software is known as the Waterfall ModelWaterfall ModelRealistic Waterfall ModelSoftware Development PhasesProblem Analysis and SpecificationDesignCodingTesting, Execution, and DebuggingMaintenanceProblem Analysis and SpecificationProblem Analysis and Specification: The problem is analyzed and a specification for the problem is formulatedFor example: if we obtain a job request looks like:Task ExampleBecause of new government regulations, we must keep more accurate record of all students currently receiving financial aid and submit regular report to FFAO (Federal Financial Aid Office). Could we get the computer to do this for us???Task AnalysisPurposePre-condition (input): describe the state of processing before the program is executedPost-condition (output): describe the state of processing after the program is executedSoftware Development PhasesProblem Analysis and SpecificationDesignCodingTesting, Execution, and DebuggingMaintenanceDesignDesign: A plan for solving the problem is formulatedVarious design methods have been developed, two of major designs we describe here: top-down design and object-oriented designTop-down designThe original problem is partitioned into simpler subproblemsFor example, the problem we just had can be obviously divided into:1. Get the student records2. Process the records3. Prepare the reportsOne level partitionTwo level partitionThree level partitionOOD:Object-Oriented DesignIdentify the objects in the problem's specification and their types.Identify the operations or tasks to manipulate the objectsProgram=Algorithm + Data StructureAlgorithm: “a step by step procedure for solving a problem or accomplishing some end”In computer science, algorithm must be:1. Definite, unambiguous2. Simple3. FiniteAlgorithmsUnstructured• goto's• if-else'sStructured• while loop• switch stmtSoftware Development PhasesProblem Analysis and SpecificationDesignCodingTesting, Execution, and DebuggingMaintenanceCodingThere’s not much we can talk in coding, you all know what it is. After you select the language, three major principles you need to follow:1. Programs and Subprograms should be well structured2. All source code should be documented3. It should be formatted in a style that enhances its readabilitySoftware Development PhasesProblem Analysis and SpecificationDesignCodingTesting, Execution, and DebuggingMaintenanceTesting, Execution, and DebuggingErrors happen all the time!!!There are three different points at which errors can be introduced:1. Syntax errors2. Run-time errors3. Logic errorsDifferent Kinds Of Tests RequiredUnit tests:Each individual program unit works?Program components tested in isolationIntegration tests : Units combined correctly?Component interface and information flow testedSystem tests: Overall system works correctly?25The "V" Life Cycle ModelTwo major types of testingBlack box testing:Outputs produced for various inputsChecked for correctness Do not consider structure of program component itself.(so basically, it just test a lot of different inputs and match with the expected outputs )Two major types of testingWhite box testing:examine code’s internal structure(Test for every loop, if statement, functions…)Test data is carefully selectedSoftware Development PhasesProblem Analysis and SpecificationDesignCodingTesting, Execution, and DebuggingMaintenanceMaintenanceAfter the software has been used for several years, they will require modificationsStudies show that a higher percentage of computing budgets and programmer time are devoted to software maintenance1970s 35-40%1980s 40-60%1990s 70-80%2000s


View Full Document

GSU CSC 2320 - Chapter 1

Download Chapter 1
Our administrator received your request to download this document. We will send you the file to your email shortly.
Loading Unlocking...
Login

Join to view Chapter 1 and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view Chapter 1 2 2 and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?