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Software Design

Compléter

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À propos de Compléter
software
usco
dsp software
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Créé par

Giancarlo Serrano
Giancarlo Serrano
Colombia

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Software Design

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Giancarlo Serrano
1

Dictionary Data line essential Computer overtimePay represent structured Explain decomposition end model decomposition three regularPay soon Explain hierarchically represents DFD appear Game


A data dictionary lists all data items appearing in the DFD model of a system . The data items listed include all data flows and the contents of all data stores appearing on the DFDs in the of a system . A data dictionary lists the purpose of all data items and the definition of all composite data items in terms of their component data items . For example , a data dictionary entry may that the data grossPay consists of the components regularPay and overtimePay .
grossPay = +
For the smallest units of data items , the data dictionary lists their name and their type . Composite data items can be defined in terms of primitive data items using the following data definition operators :
+ : denotes composition of two data items , e . g . a + b represents data a and b .
[ , , ] : represents selection , i . e . any one of the data items listed in the brackets can occur . For example , [ a , b ] represents either a occurs or b occurs .
( ) : the contents inside the bracket represent optional data which may or may not . e . g . a + ( b ) either a occurs or a + b occurs .
{ } : represents iterative data definition , e . g . { name } 5 represents five name data . { name } * represents zero or more instances of name data .
= : represents equivalence , e . g . a = b + c means that a represents b and c .
/ * * / : Anything appearing within / * and * / is considered as a comment .

Example 1 : Tic - Tac - Toe
Tic - tac - toe is a computer game in which a human player and the computer make alternative moves on a 3×3 square . A move consists of marking previously unmarked square . The player who first places three consecutive marks along a straight line on the square ( i . e . along a row , column , or diagonal ) wins the game . As as either the human player or the computer wins , a message congratulating the winner should be displayed . If neither player manages to get consecutive marks along a straight , but all the squares on the board are filled up , then the game is drawn . The computer always tries to win a game .
Specific Instructional Objectives
At the of this lesson the student will be able to :
? Identify the activities carried out during the structured analysis phase .
? what a DFD is . ? Explain why constructing DFDs are important in arriving at a good software design .
? what a data dictionary is .
? Explain the importance of data dictionary .
? Identify whether a DFD is balanced .
Structured Analysis
Structured analysis is used to carry out the top - down of a set of high - level functions depicted in the problem description and to represent them graphically . During analysis , functional decomposition of the system is achieved . That is , each function that the system performs is analyzed and decomposed into more detailed functions . Structured analysis technique is based on the following underlying principles :
? Top - down approach .
? Divide and conquer principle . Each function is decomposed independently .
? Graphical representation of the analysis results using Data Flow Diagrams ( DFDs ) .

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