OCR A Level Computer Science Paper 2 2022
Abstraction - correct answer a way of separating logical and physical parts of a problem e.g. the London underground map. You get rid of unnecessary details
Problem abstracti
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OCR A Level Computer Science Paper 2 2022
Abstraction - correct answer a way of separating logical and physical parts of a problem e.g. the London underground map. You get rid of unnecessary details
Problem abstraction - correct answer where you keep removing details until the problem reduces to one that has already been solved
Modelling and Simulation - correct answer Building a model of a real-world object can be used to solve a particular problem such as Aircraft simulation, Climate change models
Precondition - correct answers the logic part of a statement statement that has to be true for the processing part of the algorithm before it can function
Specifying a precondition before creating an algorithm ensures - correct answer the data is ok to process e.g. if it was empty it could cause the program to crash.
The function is reusable
It reduces unnecessary checks
It makes programs easier to debug and maintain
It makes programs clearer and shorter
Programming standards that make programs easy to recuse include - correct answer Documenting inputs, outputs and preconditions
Variables should use camelCase or Pascal Case
All variables should be local to that module
The documentation should contain information such as who made it, what it does and when it was written.
The code should be annotated where necessary
The module should not be greater than one page of code
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