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Programming for GCSE Topic 8.2: Pseudo Code and Flowcharts

T eaching L ondon C omputing. Programming for GCSE Topic 8.2: Pseudo Code and Flowcharts. William Marsh School of Electronic Engineering and Computer Science Queen Mary University of London. Aims. Design: what it about? Pseudo code Flowcharts My views. Design. Plan Before you build

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Programming for GCSE Topic 8.2: Pseudo Code and Flowcharts

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  1. TeachingLondon Computing Programming for GCSETopic 8.2: Pseudo Code and Flowcharts William Marsh School of Electronic Engineering and Computer Science Queen Mary University of London

  2. Aims • Design: what it about? • Pseudo code • Flowcharts • My views

  3. Design • Plan • Before you build • How for s/w? • Software is a description! • Steps towards a solution

  4. Pseudo Code

  5. Pseudo Code • Careless or informal code • Useful for • Making a start • Breaking a problem done (i.e. design) • Algorithms without code • AQA has defined a syntax • Does this miss the point?

  6. Example: Shopping List initialise shopping list and list of purchase forever get command if command is 'add' get item and add it to shopping list if command is 'buy' get item; transfer from shopping to purchase list if command is 'print' print both lists

  7. Flowcharts

  8. Statement Block • Group of instructions • No jumps • Comments! • Arrows implicit • downwards • across description

  9. Decision • Choice of two • If statement false true

  10. Example – Largest Value start • Input two numbers • Output largest input X, Y true X > Y false print X print Y stop

  11. Quiz – Flowchart for A Loop • Pseudo code • Equivalent flowchart While condition statement 1 statement 2 false ? Condition true Statement 1 Statement 2

  12. Syllabus

  13. Specification – Algorithms Candidates should be able to: understand algorithms (written in pseudocode or flow diagram), explain what they do, and correct or complete them produce algorithms in pseudocode or flow diagrams to solve problems. • Also relevant to design in the practical programming activity

  14. Summary • Flowcharts may be useful for understanding programs • Pseudo code like code without the syntax errors

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