Qbasic Modular Programming 2000 John Urrutia All rights

Qbasic Modular Programming © 2000 John Urrutia. All rights reserved. 1

Structured Programming l. Good Programming Fundamentals èReliability l Consistently produces correct output. èUnderstandable (read-able) l It shouldn’t be harder to understand than to code èRobust l Bullet Proof. èFlexible l Easy to fix and modify. © 2000 John Urrutia. All rights reserved. 2

Top Down Design l. Phase 1 èStepwise Refinement w Divide and conquer s Functional Decomposition s Data Definition © 2000 John Urrutia. All rights reserved. 3

Top Down Design l. Phase 2 èModular development w modularization s Single functionality s Re-usability © 2000 John Urrutia. All rights reserved. 4

Top Down Design l. Phase 2 èCohesion w The “internal strength” of a module w The minimal number of statements to accomplish the task. èCoupling w The separation of the workings of the module with its interface © 2000 John Urrutia. All rights reserved. 5

Top Down Design l. Phase 3 èProgram coding w HIPO s Hierarchical Input Process Output Charts w Flowcharts © 2000 John Urrutia. All rights reserved. 6

Top Down Design l. Phase 3 èTesting w Program Stubs s Modules s Functions s Sub-routines w Blackbox VS Whitebox © 2000 John Urrutia. All rights reserved. 7

Top Down Design l. Phase 3 èTesting w Black box s Functional testing w White box s Path testing © 2000 John Urrutia. All rights reserved. 8