A set of constrained logical constructs that emphasize on maintenance of functional domain are used for designing conventional components. These logical constructs are sequence, condition, and repetition. Structured programming is a design technique that constrains logic flow to three constructs: sequence, condition, and repetition. These structured constructs help in reducing the complexity of the program and enhances readability, test ability and maintainability.
GRAPHICAL DESIGN NOTATION
- Activity diagram is a descendant of flowchart in which all elements of structured programming are represented.
- In a flowchart, each step in the process is represented by a different symbol and contains a short description of the process step.
- Structured programming constructs should make it easier to understand the design. If unnecessary complexity is introduced by using them without violation, it is better ti violate them.
- Dogmatic use of structured constructs introduces inefficiency.
TABULAR DESIGN NOTATION
- Decision tables translates actions and conditions into a tabular form.
- A decision table is used when a complex set of conditions and actions are encountered within a component.
- Decision table is divided into four quadrants. Upper left quadrant lists all conditions. Lower left quadrant lists all actions. Right hand quadrants form a matrix indicating condition combinations and corresponding actions
Showing posts with label Structured constructs. Show all posts
Showing posts with label Structured constructs. Show all posts
Monday, July 25, 2011
Designing Conventional Components- Graphical Design Notation and Tabular Design Notation
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