Compléter Software DesignVersion en ligne Fill in the blanks with the words that are provided. par Giancarlo Serrano 1 represent soon end Explain overtimePay structured Data represents decomposition Explain DFD essential three regularPay appear hierarchically Dictionary model Computer Game line decomposition 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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