What does the line segment with arrows in the data flow diagram represent?
The line segments with arrows in the data flow diagram represent the data flow. In the data flow diagram, the rectangle represents the external entity of the data, the rounded rectangle represents the processing logic of transforming the data, and the double horizontal line represents the storage of the data. Data flow diagrams are tools used in structured analysis methods.
The line segments with arrows in the data flow diagram represent the data flow.
Related introduction:
Data flow diagram is a tool used in structured analysis methods. It graphically depicts the process of data flow and processing in the system. Since it only It reflects the logical functions that the system must complete, so it is a functional model.
In the structured development method, the data flow diagram is the result of the requirements analysis phase.
In the data flow diagram, the rectangle represents the external entity of the data, the rounded rectangle represents the processing logic of transforming the data, and the double horizontal line represents the storage of the data.
The data flow diagram includes:
Data symbols that indicate the existence of data. These data symbols can also indicate the media used by the data;
Indicates the processing symbols for the processing performed on the data. These symbols may also indicate the machine functions used in the processing;
Indicates several processing and/or data media Streamline symbols for data flow between;
Special symbols that facilitate reading and writing data flow diagrams.
The above is the detailed content of What does the line segment with arrows in the data flow diagram represent?. For more information, please follow other related articles on the PHP Chinese website!
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