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PowerPoint Presentation for Dennis & Haley Wixom, Systems Analysis and Design, 2nd

EditionCopyright 2003 John Wiley & Sons, Inc. All rights reserved.12 - 1

Phn Tch V Thit K H Thng ,PhinBn Th2

Alan Dennis and Barbara Haley Wixom

John Wiley & Sons, Inc.

Slides by Roberta M. RothUniversity of Northern Iowa


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Thit k chng trnh

Chng 12


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Cc nh ngha kha

Thit k chng trnh - To ra nhngch dn cho ngi lp trnh

Cch tip cn -. Bt u t ci tngqut ri dn dn thm vo cc chi tit

Ti liu thit k chng trnhTt c

cc biu v cc thuyt minh cu trcca ngi lp trnh v h thng .


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Biu cu trc

K thut quan trong thit k chngtrnh

Cho thy tt c cc thnh phn ca mtrong mt khun dng c th bc

S ni tip

S chn lcS lp i lp li


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V d v biu cu trc


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Nhng phn t ca biu cu trc

1.2

Tnh lung GPA

M un

1.2

Tnh lung GPA

Th vin m un

Lp

Dng iu khin

Mc ni iu khin

D liu mc ni

Tttrang

Mtrang


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Xy dng biu cu trc

1Nhng tin trnh trong DFD i din cho m unca biu cu trc

Hng tin trnh cung cp u vo cho hthngTrung tm tin trnh -thc hin nhng thao tcnh gi h thng

Tin trnh ra iu khin u ra h thngS cn bng trong DFD c th tng ng vi sphn cp trong biu cu trc


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Cc kiu biu cu trc

Thc hin cu trc m un iu khin gi ccm un ph thuc , mi ci iu khin mt giiquyt lin quan

Nhiu tin trnh vot tin trnh ra

Cp cao hn mc ca biu cu trc

S dng nhiu u vo to ra mt u ra mi


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S thc hin cu trc


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Cc kiu biu cu trc

Thc hin cu trc M un iu khin gi cc mun ph thuc mt cch tun t

Mi thnh phn cp di thc hin tng bc tin

trnh thay i u vo thnh u raMt s t tin trnh vo

Nhiu tin trnh ra

H thp cp ca biu cu trcNhng v tr s di chuyn ca u ra


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Bin i cu trc


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Cc bc xy dng biu cutrc

1. Xc nh cc m un mc nh v

phn tch thnh cc mc thp hn

2.Thm vo cc kt ni iu khin

3.Thm vo kt ni khc

4.Xem xt v duyt li ln cui trc khi

hon thnh


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EditionCopyright 2003 John Wiley & Sons, Inc. All rights reserved.


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Cc nguyn tc thit k

M un cc biu cu trc trongchng trnh c cht lng cao v cth d dng s dng li

Cc tiu chun

Tnh kt dnh

S mc niCc mc thch hp ca h s u vov h s u ra


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Kiu kt

Kiu kt dnh

HmTun tTruyn t thng tinTh tc

Thi gianLogicNgu nhin

WhatWould Be

an Example

of Each?

Tt

D


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V d v lin kt mc thpKt dnh logic


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Kt dnh kiu cy

Adapted from Page-Jones, 1980


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Sphn tch

Qu trnh phn chia vi lin kt thp

Phn nhim v cho cc m un khc nhau

Gim bt s dng ca cc c iu khin


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Kiu mc ni

Kiu mc ni

D liuTng ,lpiu khin

Thng thngTheo ni dung

WhatWould Be

an Example

of Each?

tt

D


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Kim tra li

C bt c ci g xy ra vi s mcni,s dnh kt khi bn to m un

khng ?C bt c ci g xy ra vi s dnh ktm un khi bn h thp s mc ni gia

chng ?


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H s gp u vo

H s gp u vo cao u tinDy mnh s s dng li ca cc m un ph thuc

1.1Calculate

EmployeeSalary

1.2Print

EmployeeRoster

1.3

CalculateBenefits

2.1.1Read

EmployeeRecord

1.1Calculate

EmployeeSalary

1.2Print

EmployeeRoster

1.3

CalculateBenefits

1.1.1Read

EmployeeRecord

1.2.1Read

EmployeeRecord

1.3.1Read

EmployeeRecord

H s gp u vo thp khng u tin


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Cht lng danh sch kim tra

1.Thvin cc m un c thc to nn bt cnino c th2.Biu c cu trc h su vo cao3.Cc m un iu khin khng c qu 7 cp thp hn

4.Mi m un thc hin mt nhim v(tnh lin kt cao)5.M un ssi chia x thng tin (mc ni lng lo)6.Cc m un c chp nhn c dliu mc ni thcshp l7.Cc mc ni iu khin hp quy cch tthp n cao

8.Mi m un c s lng tp hp cc lin kt hp l


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Chng trnh chi tit


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PowerPoint Presentation for Dennis & Haley Wixom,Systems Analysis and Design, 2ndEdition

Copyright 2003 John Wiley & Sons, Inc. All rights reserved.12 - 27

Ni dung chng trnh chi tit

Khng chun gn ng

Bao gm tt c thng tin chng trnh

Nhng s vic ghi ch thc y s hotng

Danh sch cc u vo v u ra

Tt c cc thut tonGii thiu cc ghi ch v cc b sung


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PowerPoint Presentation for Dennis & Haley Wixom, Systems Analysis and Design, 2ndEdition


Dng mt chng trnh chi tit


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V d v thut ton

(Get CD-info module)

Accept (CD_title) {Required}Accept (CD_artist) {Required}Accept (CD_category) {Required}Accept (CD_length)

Return


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S din t trc quan cc tin trnh


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Bn tm tt

Cu trc ca mt biu l phi ch ra tt c ccchc nng cu thnh cn thit trong chngtrnh mc cao .Thnh phn ca biu ch racc s kin s la chn v s lp li

i theo cc nguyn tc thit k v quan tm ns dnh kt ,mc ni ,v h s u vo / h s ura

Chun b thuyt minh chi tit ti nhng ngi

lp trnh bao gm c thut ton ch r tmquan trng ca lp trnh cu trc


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Copyright 2003 John Wiley & Sons Inc All rights reserved12 - 33

Copyright 2003

John Wiley & Sons, Inc.

All rights reserved. Reproduction or translation of this work

beyond that permitted in Section 117 of the 1976 United States

Copyright Act without the express written permission of the

copyright owner is unlawful.

Request for further information should be addressed to the

Permissions Department, John Wiley & Sons, Inc.

The purchaser may make back-up copies for his/her own use

only and not for redistribution or resale.

The Publisher assumes no responsibility for errors, omissions,

or damages, caused by the use of these programs or from the

use of the information contained herein.

Bai Dich Nhom12

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