software characteristics

software characteristics

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  Software Engineering Software characteristics Lecture# 3
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  Software Engineering  Softwarecharacteristics To gain an understanding of software it is important to examine the characteristics of software that make it different from other things that human build.
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  Software Engineering Some SoftwareCharacteristics  Software is engineered or developed, not manufactured in the traditional sense.  Software does not wear out in the same sense as hardware.
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  Software Engineering  Intheory, software does not wear out at all
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  Software Engineering  Butwhat happens when changes are requested in the software
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  Software Engineering  Mostsoftware is custom built,rather being assembled from existing components.
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  Software Engineering Software Components As the Engineering discipline evolves, a collection of standard design components are created  Standards screws and circuits are only two examples of thousand of components that are used by mechanical and electrical engineers
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  Software Engineering  Thereusable components have been created so that engineers can concentrate on the truly innovative elements of the design( new parts of the design).  In hardware this process is very common  In software this process has yet to be achieved on a broad scale.
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  Software Engineering  Reusabilityis an important characteristic of a highly software component.  A software components should be designed in such a way that it should be reused in many different programs  In 1960s, scientific subroutine libraries that were reusable were built but with limited domain of application
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  Software Engineering  Softwarecomponents are built using a programming language that has a limited vocabulary, well defend rule of syntax and semantics  At the lowest level we have machine language  At the middle level we have C , Pascal etc to produce procedural program
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  Software Engineering  Atthe highest level we have languages that use graphical description of the program.  When we produce a well maintain documented code its easier to understand and there will be efficient use of memory and vice versa  Mid level languages are machine independent  After a long period of time languages like C, COBOL are still in use  Machine, Assembly, C , Pascal etc are often referred to as 3rd generation languages and are procedural languages
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  Software Engineering  4thgeneration language move software developer even further.  Non procedural language  We only specify the desired result rather than the complete detail
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  Types of SoftwareApplications  System Software  Real Time software  Business Software  Engineering & Scientist software  Embedded Software  AI Software  Personal computer software