COMPUTER SCIENCE AND ENGINEERING
SOFTWARE ENGINEERING
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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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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Detailed explanation-1: -The Data Store symbol represents data that is not moving (delayed data at rest). The Process symbol represents an activity that transforms or manipulates the data (combines, reorders, converts, etc.). Any system can be represented at any level of detail by these four symbols.
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.
Detailed explanation-4: -There are four symbols in the DFD language, that is, processes, data flows, data stores, and external entities, each of which is represented by a different graphic symbol. An external entity sends or receives data from the system. It is represented by a rectangle.