L09topdown

L09topdown - function predefined, programmer-defined...

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Unformatted text preview: function predefined, programmer-defined arguments, (formal) parameters return value function call, function invocation function definition head, body function prototype (declaration) expanded form, abbreviated form local variables, global variables, scope call-by-value black box principle, information hiding, procedural abstraction What Is? Top-Down Program Design Debugging Functions humans can only handle a certain (relatively low) level of complexity a program longer than 50 (20?) lines is already probably too complex top-down design- a method to decrease complexity a programming task by by breaking it down into a few simpler relatively independent subtasks (other method names - stepwise refinement and divide and conquer ) if a subtask is still complex - further subdivide each simple subtask should be coded by a separate function or other separated piece of code added benefit - separate people (or separate teams) can work on different subtasks black box principle is important Top-Down Design problem : a large economy size pizza is not always the best buy: pizza sizes are given as a diameter (in inches)...
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L09topdown - function predefined, programmer-defined...

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