PPE Paper 2 Revision

PPE Paper 2 Revision

1. Computational Thinking

   • Abstraction
     • Removes unnessacry inofrmation in order to make problems less complex
   • Decomposisition
     • Breaking down a problem to make it easier to solve
   • Algorithmic thinking
     • logical steps taken to solve a complex problem

2. Syntax / logic errors

   • Syntax error
     • Error in the rule of the language
   • logic error
     • Code runs not as it is expected to

3. DIV / MOD

   • DIV
     • Uses floor division (whole numbers)
   • MOD
     • Returns the remainder after devision

4. Code maintenance

   • Indentation
   • Comments
   • Contrasts
   • Purposeful variable names

5. Translators

   • Compiler
     • Translates entire source code at once
   • Interpreter
     • Translates source code one line at a time

6. Testing

   • Two main types of testing
     • Final
       • After development
     • Iterative
       • During development
     • To check if program works as intended
   • Used to find defects before releasing the code

7. Defensive design

   • Authentication
     • Logging in
   • Verification
     • Checking accuracies
   • Validation
     • Checking to see if data is sensible
   • Sanitisation
     • Removing unwanted characters