Writing Algorithms- Flow Diagrams

Writing Algorithms- Flow Diagrams

Writing Algorithms - Flow Diagrams

Definition and Importance

  • A flow diagram is a graphical way to describe a process or a system.
  • It provides a visual representation of the sequence of steps taken to solve a problem.
  • Flow diagrams are used in Computer Science to depict algorithms and show the flow of control from one operation to another.

Symbols and Structure

  • Various symbols are used in flow diagrams, each with a different meaning.
  • The oval represents the start or end point of an algorithm.
  • A rectangle is used to denote a process or operation such as a calculation or assignment.
  • The diamond stands for a decision point, with one path for ‘yes’ or ‘true’ and another for ‘no’ or ‘false’.
  • The parallelogram is used for input and output tasks.
  • Arrows are used to show the direction of flow.

Process of Creating Flow Diagrams

  • Begin by fully understanding the problem. Define the problem, its inputs, processes, and expected output.
  • Split the problem into smaller tasks or steps using decomposition.
  • Draw your flow diagram step by step based on the tasks or steps, utilizing the appropriate symbols for each action.
  • Check your flow diagram for possible errors or improvements.

Best Practices

  • Make use of color for clarity and to differentiate between different types of operations.
  • Keep the flow from top to bottom and left to right to maintain readability.
  • Limit the number of decision points (diamonds) to minimize complexity.
  • Keep your diagram balanced with respect to shape, flow, and spacing.

Benefits of Flow Diagrams

  • Help with visualising the sequence of operations and the flow of control within an algorithm.
  • Useful for explaining and demonstrating solutions to others.
  • Can be verified for logical errors before implementation into a programming language.
  • They improve understanding and communication of the algorithm.

Always use flow diagrams to visualise and design your algorithms. They are a powerful tool to enhance comprehension and to train your computational thinking skills in a visual and interactive way. Practice by creating flow diagrams for various tasks, and always review and edit your work.