INTRODUCTION TO SOFTWARE ENGINEERING
OVERVIEW OF SOFTWARE ENGINEERING
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A data store in a DFD represents:
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a sequential file
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a disk store
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a repository of data
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a random access memory
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Explanation:
Detailed explanation-1: -A data store or data repository is used in a data-flow diagram to represent a situation when the system must retain data because one or more processes need to use the stored data in a later time.
Detailed explanation-2: -Explanation: A logical file can be a data structure or a physical file on disk.
Detailed explanation-3: -Data flow diagrams represent systems by use of a sparse number of symbols. Systems processes are symbolized by circles, entities external to the system which interact with the system are represented by rectangles, and data stores are denoted by an open ended rectangle.
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