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The child is connected to its parent, but the parent is not connected to the child.
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Object-oriented programming Subclass coupling Describes the relationship between a child and its parent. Each datum is an elementary piece, and these are the only data shared (e.g., passing an integer to a function that computes a square root).
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Data coupling Data coupling occurs when modules share data through, for example, parameters. In this situation, a modification in a field that a module does not need may lead to changing the way the module reads the record. Stamp coupling (data-structured coupling) Stamp coupling occurs when modules share a composite data structure and use only parts of it, possibly different parts (e.g., passing a whole record to a function that needs only one field of it). Control coupling Control coupling is one module controlling the flow of another, by passing it information on what to do (e.g., passing a what-to-do flag). This is basically related to the communication to external tools and devices. External coupling External coupling occurs when two modules share an externally imposed data format, communication protocol, or device interface. But it can lead to uncontrolled error propagation and unforeseen side-effects when changes are made. Common coupling Common coupling is said to occur when several modules have access to the same global data. This violates information hiding - a basic design concept.
#COHESION AND COUPLING IN SOFTWARE ENGINEERING PPT CODE#
Content coupling (high) Content coupling is said to occur when one module uses the code of other module, for instance a branch. a set of one or more statements having a name and preferably its own set of variable names. ISBN 978-0-7356-1967-8.Ī module here refers to a subroutine of any kind, i.e. Structured Design: Fundamentals of a Discipline of Computer Program and Systems Design.
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Temporal cohesion Temporal cohesion is when parts of a module are grouped by when they are processed - the parts are processed at a particular time in program execution (e.g., a function which is called after catching an exception which closes open files, creates an error log, and notifies the user). Example: Logical cohesion Logical cohesion is when parts of a module are grouped because they are logically categorized to do the same thing even though they are different by nature (e.g., grouping all mouse and keyboard input handling routines). Cohesion types, from the worst to the best, are as follows: Coincidental cohesion (worst) Coincidental cohesion is when parts of a module are grouped arbitrarily the only relationship between the parts is that they have been grouped together (e.g., a “Utilities” class). Cohesion is a qualitative measure, meaning that the source code to be measured is examined using a rubric to determine a classification.