Wk04_Flowchart - Flowlines are indicated by straight lines...

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Flowlines are indicated by straight lines with optional arrows to show the direction of data flows. The arrowhead is necessary with the flow direction might be in doubt. Flowlines are used to connect blocks by exiting from one and entering another. Flatten ellipses indicate the start and the end of a module. An ellipse uses the name of the module at the start. The end is indicated by the word end or stop for the top Control and the word exit for all other modules. The rectangle indicates a processing block, for such things as calculations, opening and closing files, and so forth. A processing block has one entrance and one exit. The parallelogram indicates input to and output from the computer memory. An IO block has one entrance and one exit. The diamond indicates a decision. It has one entrance and
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