BM306 Software
Engineering
Asst. Prof. Dr. Meryem Şerifi
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software engineering, Cheat Sheet of Computational Techniques
software engineering lessons lecture
Typology: Cheat Sheet
2022/2023
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BM306 Software
Engineering
Asst. Prof. Dr. Meryem Şerifi
Outline
STRUCTURE CHART
Structured English
Pseudo-Code
DECISION TABLES
Entity-Relationship Model
STRUCTURE CHART
Structure chart is a chart derived from Data Flow Diagram. It represents the system in more detail than DFD. It breaks down the entire system into lowest functional modules, describes functions and sub-functions of each module of the system to a greater detail than DFD. Structure chart represents hierarchical structure of modules. At each layer a specific task is performed.
STRUCTURE CHART
symbols used in construction of structure charts : Module - It represents process or subroutine or task. A control module branches to more than one sub-module. Library Modules are re-usable and invokable from any module.
STRUCTURE CHART
Jump - An arrow is shown pointing inside the module to depict that the control will jump in the middle of the sub module.
STRUCTURE CHART
Loop - A curved arrow represents loop in the module. All sub-modules covered by loop repeat execution of module.
STRUCTURE CHART
Control flow - A directed arrow with filled circle at the end represents control flow.
Structured English
Graphs or diagrams, may are sometimes interpreted differently by different people. Hence, analysts and designers of the software come up with tools such as Structured English.
Structured English
following are some tokens of structured programming. IF-THEN-ELSE, DO-WHILE-UNTIL
Structured English
Customer Authentication in the online shopping environment.
Pseudo-Code
Pseudo code is written more close to programming language. It may be considered as augmented programming language, full of comments and descriptions. Pseudo code avoids variable declaration but they are written using some actual programming language’s constructs, like C, Fortran, Pascal etc.
Pseudo-Code
Pseudo code contains more programming details than Structured English. It provides a method to perform the task, as if a computer is executing the code.