software characteristics

software characteristics for Software engineering,All characteristics and details about software For bscs , bsit , mcs , bcs
Software engineering lectures

1. Software Engineering
Software characteristics
Lecture # 3

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, notmanufactured
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 3
rd
generation languages and are
procedural languages

12. Software Engineering
4
th
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