Types of system software

Different types of System Software along with its description and examples

1. INTRODUCTION TO SYSTEM SOFTWARE INDERBIR KAUR SANDHU FACULTY PG.DEPARTMENT OF COMPUTER SCIENCES GSSDGS KHALSA COLLEGE, PATIALA

2. HARDWARE & SOFTWARE A computer is collection of hardware and software . Hardware refers to the physical devices of a computer system. The input, storage, processing, control and output devices are hardware . A Software is collection of programs and procedures whose objectives is to enhance the capabilities of hardware machine.

3. TYPES OF SOFTWARE Application Software Utility Software System Software

4. Application Software Application software is the software that is designed to satisfy a particular need of a particular environment . The programs included in a application package are called application programs and the person who prepare application programs is known as application programmer .

5. Application Software Application software are developed to serve a specific purpose only . For example : Microsoft word is used for documentation purpose only cannot use it for any other purpose .

6. Utility Software Utility software is the set of programs provided to ensure the proper functioning of the computer . Examples of utility software is Antivirus program .

7. System Software System software is a set of one or more programs, designed to control the operation of a computer system. These program do not solve specific problems. They are general programs written to help humans in the use of computer system. The programs included in a system software are called system programs the person who prepares system software is known as system programmer .

8. SYSTEM SOFTWARE Language Processors/Translator Macro Processor Linker Text Editor Loader Debugger Operating System ASSEMBLER INTERPRETER COMPILER

9. LANGUAGE TRANSLATOR Language translator are used to convert the instructions written in one type of language into another type . (Assembly to Machine/High level to Machine)

10. ASSEMBLER An assembler is a system software that converts assembly language program into machine language . Assembly language program is known as source program and machine language program is known as object program .

11. ASSEMBLER Assembly Language Program (Source Program) ASSEMBLER Machine Language Program (Object Program) Input Output

12. COMPILER A compiler is another language translator that converts high level language into machine language . The main advantages of compiler is that translates the whole program at once . The program written in high level language is called source program and the program written in machine language is known as object program .

13. COMPILER High Level Language (Source Program ) COMPILER Machine Language Program (Object Program) Input Output

14. INTERPRETER Interpreter is also a language translator used for converting high level language into machine code . Interpreter translate the program line by line , while the program is running . and this is the main difference between compiler and interpreter.

15. INTERPRETER High Level Language (Source Program) Machine Level Language (Object Program) INTERPRETER Input Output

16. MACRO PROCESSOR Macro processor is a system software that replaces the macro instructions with the corresponding groups of source language statement that a macro represents. Macro instruction is a single line abbreviation for a group of statements. The use of macro processor arises when a source program contains a set of statement repeatedly.

17. MACRO PROCESSOR Source program Program with macro definition and calls Machine Language program MACRO PROCESSOR ASSEMBLER PROGRAM WITHOUT MACRO Target program

18. LINKER Linker is a system software that combines or links various object modules in order to create the executable form of the program. The two main functions of linker are: To resolve external references To perform relocations. Linker also produce error messages if some external reference could not be resolved .

19. LINKER Object Module 1 Object Module 2 Object Module n Linker Executable Module Error Message

20. LOADER A loader is a system software that places the program into memory and prepares them for execution . Thus loading is a process of bringing an executable file produced by the linker from secondary storage to the primary storage in such a way that it can be executed by the operating system .

21. LOADER The main functions of loader are: Allocation Relocation Linking Loading

22. LOADER Program 1 Program 2 Program 3 LOADER Program 1 Program 2 Program 3

23. TEXT EDITOR A text editor is a software that allow the user to input, delete, update and store information such as data, programs and letters. An interactive editor allows a user to create and revise a target document. Editors are mostly used by the program developer.

24. DEBUGGER Debugger is a software tools that provides a controlled execution environment. In this environment the program is run , so that it can be interrupted or suspended at some desirable point. Thus debugger is a piece of software that allow a user to run program interactively, stopping and starting it and examining the content of memory and the call stack.

25. DEBUGGER Functions of Debugger: The ability to control the execution of a program . 2. The ability to inspect and assign values to variables.

26. OPERATING SYSTEM An operating system is a program that acts as an interface between the user of a computer and the computer hardware. The purpose of operating system is to provide an environment in which a user can execute programs in a efficient manner. Operating system is a first program that gets loaded into the memory through a process called booting .

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