software characteristics
- 2. Software Engineering Software characteristics 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.
- 3. Software Engineering Some Software Characteristics Software is engineered or developed, not manufactured in the traditional sense. Software does not wear out in the same sense as hardware.
- 4. Software Engineering In theory, software does not wear out at all
- 5. Software Engineering But what happens when changes are requested in the software
- 6. Software Engineering Most software is custom built,rather being assembled from existing components.
- 7. 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
- 8. Software Engineering The reusable 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.
- 9. Software Engineering Reusability is 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
- 10. Software Engineering Software components 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
- 11. Software Engineering At the 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
- 12. Software Engineering 4th generation language move software developer even further. Non procedural language We only specify the desired result rather than the complete detail
- 13. Types of Software Applications System Software Real Time software Business Software Engineering & Scientist software Embedded Software AI Software Personal computer software