System Programming
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overview of system programming. level of system software.software hierarchy and life cycle of source program. system software development and trends of system software.
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Almost all software development methodologies are non-technical. This means they do not deal with the technical aspects of software design and development. They focus more on the internal operations, and other processes involved in the project.
Take note that each has its specific features. Gauge your options, and choose the best one that suits your needs.
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System Programming
- 1. Content OVERVIEW OF SYSTEM SOFTWARE LIFE CYCLE OF A SOURCE PROGRAM SYSTEM SOFTWARE DEVELOPMENT RECENT TRENDS IN SOFTWARE DEVELOPMENT
- 2. Overview of System Software Software • A set of instruction to perform specific tasks is called a Program. • The collection of one or many programs for a specific purpose is called Software.
- 3. Software Hierarchy USER APPLICATION SOFTWARE UTILITY SOFTWARE SYSTEM SOFTWARE (INCLUDING OS) HARDWARE A software which is developed to help the user to perform specific tasks is called application software. The system software is the interface between the hardware and user applications. This software is designed for users to assist in maintenance and monitoring activities.
- 6. System Programming • System programming involves designing and writing computer programs that allow the computer hardware to interface with the programmer and the user , leading to the effective execution of application software on the computer system.
- 7. Life Cycle of Source Program Compile Time Load Time Execution Time Source Program Assemblerof Compiler Object Code LinkageEditor Load Module Loader Binary Memory Image Object Modules System Libraries Dynamic System Libraries
- 8. • Edit time : It is the phase where editing of program code takes place and is also known as design time. • Compile time : At this stage , the source code after editing is passed to a translator that translates it into machine code.This stage checks the program for inconsistencies and error produces an executable file. • Distribution time : In this stage that sends or distributes the program from the entity creating it to an entity invoking it.
- 9. • Installation time : A program goes through the installation process , which makes ready for execution within the system. • Link time : At this stage , the specific implementation of the interface is linked and associated to the program invoking it. • Load time : This stage actively takes the execution image from its stored repositories and places them into active memory to initiate the execution. • Run time : This stage of the life cycle in which the programmed behavior of the source program is demonstrated.
- 11. • Preliminary analysis : Begin with a preliminary analysis, propose alternative solutions, describe costs and benefits, and submit a preliminary plan with recommendations. • Systems analysis : Define project goals into defined functions and operations of intended application. This involves the process of gathering interpreting facts, diagnosing problems, and recommending improvements to the system. • Systems design : At this step desired features and operations are described in details, including screen layouts, business rules, process diagram pseudocode, and other documentation. • System tool acquisition : It decides and works around the software tools to develop the functionalities of the system software.
- 12. • Implementation : It builds the software using the software tools with all the functionality , interfaces and support for the execution. This may be specify as the system software adheres to the architecture. • Maintenance : During the maintenance stage of the SDLC, the system is assessed/evaluated to ensure it does not become obsolete. This is where changes are made to initial software
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