Software Engineering INTRODUCTION Software engineering is application of a systematic and disciplined approach to the development, operation and maintenance of software in an efficient and cost effective way.
Programmes v/s Software product Programmes: A computer program is a sequence of instructions, written to perform a specified task with a computer. A collection of computer programs and related data is referred as software. Software program: there are three basic entities which are generally used while defining the principles of software engineering are – Software process Software projects Software products
Difference between programmes and software product Software product are merchandise consisting of a computer program that is offered to sale. Software products are developed by multiple users. Software products are extremely large in size. In software products, most user are not involved with development. Software products must be well documented. Programmes are set of instructions for computer to perform a specified task. Programmes are developed by individuals. Programmes are smaller in size. In case of programmes, programmer himself is the sole user. In programmes, very little documentation are required.
Emergence of software engineering 1. Early computer programming:- early commercial computer were very slow and too elementary as compared to today’s standards. In 1968, key concept of modularity and information hiding were also introduced to help programmers deals with every increasing complexity of software system.
2. High level programming:- the high level language that are more powerful, easier to use and directed towards specialized classes of problems. A list of some high level language:- COBOL PL/I BASIC PASCEL C C++ JAVA FORTAN
SOFTWARE DESIGN Software design process have two levels:- System design or external design Internal design or detail design There are basically three approaches to software design- Data structured oriented design Control flow based design Object oriented design
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