A Level Computer Science OCR Practice Exam

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In flowchart notation, a parallelogram is used to represent what?

Process
Decision
Input/Output
Start/End

The correct answer is: Input/Output

In flowchart notation, a parallelogram is specifically used to represent input and output operations. This includes any action where data is being received (input) or sent (output), such as reading user input from a keyboard or displaying results on a screen. The choice of a parallelogram for these operations is standard in flowcharting because it visually distinguishes input/output processes from other types of operations, such as processes represented by rectangles, and decisions represented by diamonds. By using distinct shapes for different actions, flowcharts allow for clearer understanding and comprehension of the flow of information and logic in a given system or algorithm. This consistent use of shapes in flowcharts makes it easier for anyone reading the chart to quickly identify the types of actions being performed, contributing to effective communication of the overall logic and structure.