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Programming

Flowcharts and algorithm representation

  • 3 things to know
  • AS Unit 1

Overview

The standard flowchart symbols for start and stop, process, decision and input or output, how sequence, selection and iteration appear in each, and when a flowchart is clearer than pseudocode.

What you need to know

Answer each one before you reveal it.

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Evaluation

Give two advantages of using a flowchart to set out an algorithm.

Key term

Which flowchart symbol marks the beginning and the end of an algorithm?

Key term

What does a rectangle represent in a flowchart?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What is a flowchart?

    Model answer

    A flowchart is a diagram that represents an algorithm as a set of standard symbols joined by arrows showing the order in which the steps are carried out.

  2. 2

    Which flowchart symbol marks the beginning and the end of an algorithm?

    Model answer

    The beginning and the end are shown by the terminator symbol, which takes the shape of a rounded rectangle.

  3. 3

    What does a rectangle represent in a flowchart?

    Model answer

    A rectangle is the process symbol, used for a step such as a calculation or the storing of a value in a variable.

  4. 4

    What does a parallelogram represent in a flowchart?

    Model answer

    A parallelogram is the input or output symbol, used wherever data is read in or a result is displayed or printed.

  5. 5

    What does a diamond represent in a flowchart?

    Model answer

    A diamond is the decision symbol, holding a condition and having a separate labelled exit for each possible answer, normally yes and no.

  6. 6

    What is the purpose of the arrows in a flowchart?

    Model answer

    The arrows are flow lines, and they show the order in which the symbols are carried out and which route is taken out of a decision.

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