SlideShare a Scribd company logo
1 of 40
Download to read offline
SOFTWARE
Software is a set of instructions, data or programs used to
operate computers and execute specific tasks.
Software instructions tells a computer what to do.
SOFTWARE TYPES
SYSTEM SOFTWARE
Operating System: manages all the resources such as memory, CPU, printer, hard disk, etc., and
provides an interface to the user, which helps the user to interact with the computer system.
Examples of operating systems are Linux, Apple macOS, Microsoft Windows, etc.
Language Processor: converts programs written in high-level programming languages like Java, C,
C++, Python, etc (known as source code), into sets of instructions that are easily readable by
machines(known as object code or machine code).
Device Driver: A device driver is a program or software that controls a device and helps that device
to perform its functions. Every device like a printer, mouse, modem, etc. needs a driver to
connect with the computer system eternally.
SYSTEM SOFTWARE
System software is computer software designed
• to operate and control the computer hardware
• to provide a platform for running application software.
SYSTEM SOFTWARE
System software consists of a variety of programs that
support the operation of a computer
• Assembler
• Linker
• Loader
• Macro processor
• Text editor
• Debugger
• File System
• Database
SYSTEM SOFTWARE
The role of Systems Software –interface
between users, application software and
hardware
APPLICATION SOFTWARE
• Application software, also known as an application.
• Application is computer software designed to help the user to
perform specific tasks.
• Examples include enterprise software, accounting
software, and graphics software and media players.
Difference between System Software and
Application Software
System Software Application Software
System software consists of a
variety of programs that support the
operation of a computer. for example
operating system, assembler, loader,
linker, and microprocessor and text
editor.
Application software is a set of one
or more programs, designed to solve
a specific problem. for example
employee management system,
bank management system, and
media player.
System software
is system dependent
application software is not
a system dependent
system software works directly with
the hardware
application software works directly
with the system software.
system software are written in
machine or assembly languages.
variety of programming languages
can be used to write application
software, such as C , Java and .NET
Types of System Software
 Compiler
 Assembler
 Linker
 Loader
 Macro processor
 Text editor
 Debugger
 File System
 Database
Compiler
The compiler is software program that converts a program written in a high-
level language (Source Language like C, C++, Java) to low-level language
(Machine Language).
COMPILER TYPES
Cross Compiler: that runs on a machine ‘A’ and produces a code for another
machine ‘B’.
It is capable of creating code for a platform other than the one on which the
compiler is running.
Source-to-source Compiler or transcompiler or transpiler: is a compiler that
translates source code written in one programming language into the source
code of another programming language.
COMPILER TYPES
Incremental Compilers: is a compiler, which executes the
recompilation of only a changed source instead of compiling the
complete source code.
Single-Pass Compiler: Single pass compiler reads the code only
once and then translates it. The one-pass compiler passes only once
through the parts of each compilation unit.
Multi-Pass Compiler: A multi-pass compiler can process the source
code of a program multiple times.
• In the first pass, the compiler can read the source code, scan it, extract the
tokens and save the result in an output file.
• In the second pass, the compiler can read the output file produced by the first
pass, produces machine code.
Assembler
Assembly Level language Machine level language
program program
Assembler
Data Structures
Pass 1 Pass 2
Intermediate file Object program
Source program
OPTAB
SYMTAB
LOCCTR
• Operation Code Table (OPTAB)
• Symbol Table (SYMTAB)
• Location Counter (LOCCTR)
Load-and-Go Assembler
• Load-and-go assembler generates their object code in
memory for immediate execution.
• No object program is written out, no loader is needed.
Loaders and Linkers
Linker
Object File 1
Object File 2
Object File 3
Executable File
Loader
Secondary
memory
Main memory
Loader
200 Prog A
201 A=10
202 B=20
203 C=[201]+[202]
204 End
LOADER
200
201
202
203
204
205
206
207
208
209
210 Prog A
211 A=10
212 B=20
213 c=[201]+[202]
214 End
215
Secondary memory
Main memory
Reason for Program Relocation
• To increase the efficiency of the machine
• Want to load and run several programs at the same time
(multiprogramming)
• Must be able to load programs into memory wherever there is
room
• Actual starting address of the program is not known until load time
Processes to Run an Object Program
• Loading
– Brings object program into memory
• Relocation
– Modifies the object program where
absolute addresses are specified
• Linking
– Combines two or more separate
object programs and supplies
information needed to allow cross-
references.
Absolute loader
Loader
Linking loader
Linker
Macro processor
Source Code
(with macro)
Expanded
Source Code
Macro
processor
Macro Processor
• Recognize macro definitions
• Save the macro definition
• Recognize macro calls
• Expand macro calls
Source
Code
(with macro)
Macro
Processor
Expanded
Code
Compiler or
Assembler
obj
Copy code -- Example
Source
STRG MACRO
STA DATA1
STB DATA2
STX DATA3
MEND
.
STRG
.
STRG
.
.
Expanded source
.
.
.
STA DATA1
STB DATA2
STX DATA3
.
STA DATA1
STB DATA2
STX DATA3
.
{
{
Text editor
A text editor is a type of program used for editing plain text files.
Editors or text editors are software programs that enable the user to create
and edit text files.
Windows: Notepad, WordPad
UNIX OS: vi, emacs, Jed, Pico
Text editor
Types of Editors
Line editor: you can only edit one line at a time or an integral number of lines.
Ex : Teleprinter, edlin, teco
Stream editors: the file is treated as continuous flow or sequence of characters
instead of line numbers, which means here you can type paragraphs.
Ex : Sed editor in UNIX
Screen editors: the user is able to see the cursor on the screen and can make
a copy, cut, paste operation easily. It is very easy to use mouse pointer.
Ex : vi, emacs, Notepad
Word Processor: it allows one to use some format to insert images, files,
videos, use font, size, style features.
Structure Editor: Structure editor focuses on programming languages. It
provides features to write and edit source code.
Ex : Turbo C, Netbeans IDE
Debugger
A debugger or debugging tool is a computer
program that is used to test and debug other programs.
• Break points
• Watch window
Previous Year Questions
5. The language which a computer can understand is
a. high level language b. assembly language
c. machine language d. all of the above
Previous Year Questions
5. The language which a computer can understand is
a. high level language b. assembly language
c. machine language d. all of the above
Previous Year Questions
11. A linker
a. is a software programme
b. combines part of a programme
c. is a programme used to load monitor into main memory
d. Both (a) and (b)
Previous Year Questions
11. A linker
a. is a software programme
b. combines part of a programme
c. is a programme used to load monitor into main memory
d. Both (a) and (b)
Previous Year Questions
15. An assembler in a computer system prepares
a. machine-language programme from a symbolic language
programme
b. object programme
c. assembles computer instructions and data in the machine
d. None of these
Previous Year Questions
15. An assembler in a computer system prepares
a. machine-language programme from a symbolic language
programme
b. object programme
c. assembles computer instructions and data in the machine
d. None of these
Previous Year Questions
20. Which one of the following is not system software
a. MS DOS b. UNIX C. Windows d. JAVA
Previous Year Questions
20. Which one of the following is not system software
a. MS DOS b. UNIX C. Windows d. JAVA
Previous Year Questions
67 An 'Assembler' for microprocessor is used for
a. assembly of processors in a production line
b. creation of new programs using different modules
c. translation of a program from assembly language to machine
language
d. Translation of a higher-level language into English text.
Previous Year Questions
67 An 'Assembler' for microprocessor is used for
a. assembly of processors in a production line
b. creation of new programs using different modules
c. translation of a program from assembly language to machine
language
d. Translation of a higher-level language into English text.
Previous Year Questions
Previous Year Questions

More Related Content

Similar to Introduction.pptx

Bsc cs i pic u-1 introduction to c language
Bsc cs i pic u-1 introduction to c languageBsc cs i pic u-1 introduction to c language
Bsc cs i pic u-1 introduction to c languageRai University
 
Mca i pic u-1 introduction to c language
Mca i pic u-1 introduction to c languageMca i pic u-1 introduction to c language
Mca i pic u-1 introduction to c languageRai University
 
An overview of computers and programming languages
An overview of computers and programming languages An overview of computers and programming languages
An overview of computers and programming languages Ahmad Idrees
 
Software and hardware presentation
Software and hardware presentationSoftware and hardware presentation
Software and hardware presentationnjabulo madonsela
 
SPOS_UNIT I System Programming and Operating System.pdf
SPOS_UNIT I System Programming and Operating System.pdfSPOS_UNIT I System Programming and Operating System.pdf
SPOS_UNIT I System Programming and Operating System.pdfreshma96176
 
Mba i-ifm-u-2-computer software
Mba i-ifm-u-2-computer softwareMba i-ifm-u-2-computer software
Mba i-ifm-u-2-computer softwareRai University
 
Diploma ii cfpc u-1 introduction to c language
Diploma ii  cfpc u-1 introduction to c languageDiploma ii  cfpc u-1 introduction to c language
Diploma ii cfpc u-1 introduction to c languageRai University
 
Power Point Lesson 04
Power Point  Lesson 04Power Point  Lesson 04
Power Point Lesson 04Nasir Jumani
 
Software programming and development
Software programming and developmentSoftware programming and development
Software programming and developmentAli Raza
 
Computer and programing basics.pptx
Computer and programing basics.pptxComputer and programing basics.pptx
Computer and programing basics.pptxgaafergoda
 
System Software vs.Application Software
System Software vs.Application SoftwareSystem Software vs.Application Software
System Software vs.Application SoftwareAashima Wadhwa
 
Inroduction System Software -features Types
Inroduction System Software -features TypesInroduction System Software -features Types
Inroduction System Software -features TypesSwapnaliPawar27
 
Introduction to system programming
Introduction to system programmingIntroduction to system programming
Introduction to system programmingsonalikharade3
 
SPCC:System programming and compiler construction
SPCC:System programming and compiler constructionSPCC:System programming and compiler construction
SPCC:System programming and compiler constructionmohdumaira1
 
bui ba ba
bui ba babui ba ba
bui ba babuibaba
 
Insight into progam execution ppt
Insight into progam execution pptInsight into progam execution ppt
Insight into progam execution pptKeerty Smile
 

Similar to Introduction.pptx (20)

Bsc cs i pic u-1 introduction to c language
Bsc cs i pic u-1 introduction to c languageBsc cs i pic u-1 introduction to c language
Bsc cs i pic u-1 introduction to c language
 
Mca i pic u-1 introduction to c language
Mca i pic u-1 introduction to c languageMca i pic u-1 introduction to c language
Mca i pic u-1 introduction to c language
 
An overview of computers and programming languages
An overview of computers and programming languages An overview of computers and programming languages
An overview of computers and programming languages
 
Software and hardware presentation
Software and hardware presentationSoftware and hardware presentation
Software and hardware presentation
 
SPOS_UNIT I System Programming and Operating System.pdf
SPOS_UNIT I System Programming and Operating System.pdfSPOS_UNIT I System Programming and Operating System.pdf
SPOS_UNIT I System Programming and Operating System.pdf
 
Mba i-ifm-u-2-computer software
Mba i-ifm-u-2-computer softwareMba i-ifm-u-2-computer software
Mba i-ifm-u-2-computer software
 
Diploma ii cfpc u-1 introduction to c language
Diploma ii  cfpc u-1 introduction to c languageDiploma ii  cfpc u-1 introduction to c language
Diploma ii cfpc u-1 introduction to c language
 
Software Concepts Notes
Software Concepts NotesSoftware Concepts Notes
Software Concepts Notes
 
SOFTWARE
SOFTWARESOFTWARE
SOFTWARE
 
Power Point Lesson 04
Power Point  Lesson 04Power Point  Lesson 04
Power Point Lesson 04
 
Introduction of C Programming
Introduction of C ProgrammingIntroduction of C Programming
Introduction of C Programming
 
Software programming and development
Software programming and developmentSoftware programming and development
Software programming and development
 
Chapter1.pdf
Chapter1.pdfChapter1.pdf
Chapter1.pdf
 
Computer and programing basics.pptx
Computer and programing basics.pptxComputer and programing basics.pptx
Computer and programing basics.pptx
 
System Software vs.Application Software
System Software vs.Application SoftwareSystem Software vs.Application Software
System Software vs.Application Software
 
Inroduction System Software -features Types
Inroduction System Software -features TypesInroduction System Software -features Types
Inroduction System Software -features Types
 
Introduction to system programming
Introduction to system programmingIntroduction to system programming
Introduction to system programming
 
SPCC:System programming and compiler construction
SPCC:System programming and compiler constructionSPCC:System programming and compiler construction
SPCC:System programming and compiler construction
 
bui ba ba
bui ba babui ba ba
bui ba ba
 
Insight into progam execution ppt
Insight into progam execution pptInsight into progam execution ppt
Insight into progam execution ppt
 

Recently uploaded

Transdisciplinary Pathways for Urban Resilience [Work in Progress].pptx
Transdisciplinary Pathways for Urban Resilience [Work in Progress].pptxTransdisciplinary Pathways for Urban Resilience [Work in Progress].pptx
Transdisciplinary Pathways for Urban Resilience [Work in Progress].pptxinfo924062
 
The Emergence of Legislative Behavior in the Colombian Congress
The Emergence of Legislative Behavior in the Colombian CongressThe Emergence of Legislative Behavior in the Colombian Congress
The Emergence of Legislative Behavior in the Colombian CongressMaria Paula Aroca
 
6 ways Samsung’s Interactive Display powered by Android changes the classroom
6 ways Samsung’s Interactive Display powered by Android changes the classroom6 ways Samsung’s Interactive Display powered by Android changes the classroom
6 ways Samsung’s Interactive Display powered by Android changes the classroomSamsung Business USA
 
Employablity presentation and Future Career Plan.pptx
Employablity presentation and Future Career Plan.pptxEmployablity presentation and Future Career Plan.pptx
Employablity presentation and Future Career Plan.pptxryandux83rd
 
CHUYÊN ĐỀ ÔN THEO CÂU CHO HỌC SINH LỚP 12 ĐỂ ĐẠT ĐIỂM 5+ THI TỐT NGHIỆP THPT ...
CHUYÊN ĐỀ ÔN THEO CÂU CHO HỌC SINH LỚP 12 ĐỂ ĐẠT ĐIỂM 5+ THI TỐT NGHIỆP THPT ...CHUYÊN ĐỀ ÔN THEO CÂU CHO HỌC SINH LỚP 12 ĐỂ ĐẠT ĐIỂM 5+ THI TỐT NGHIỆP THPT ...
CHUYÊN ĐỀ ÔN THEO CÂU CHO HỌC SINH LỚP 12 ĐỂ ĐẠT ĐIỂM 5+ THI TỐT NGHIỆP THPT ...Nguyen Thanh Tu Collection
 
Scientific Writing :Research Discourse
Scientific  Writing :Research  DiscourseScientific  Writing :Research  Discourse
Scientific Writing :Research DiscourseAnita GoswamiGiri
 
Grade Three -ELLNA-REVIEWER-ENGLISH.pptx
Grade Three -ELLNA-REVIEWER-ENGLISH.pptxGrade Three -ELLNA-REVIEWER-ENGLISH.pptx
Grade Three -ELLNA-REVIEWER-ENGLISH.pptxkarenfajardo43
 
Farrington HS Streamlines Guest Entrance
Farrington HS Streamlines Guest EntranceFarrington HS Streamlines Guest Entrance
Farrington HS Streamlines Guest Entrancejulius27264
 
31 ĐỀ THI THỬ VÀO LỚP 10 - TIẾNG ANH - FORM MỚI 2025 - 40 CÂU HỎI - BÙI VĂN V...
31 ĐỀ THI THỬ VÀO LỚP 10 - TIẾNG ANH - FORM MỚI 2025 - 40 CÂU HỎI - BÙI VĂN V...31 ĐỀ THI THỬ VÀO LỚP 10 - TIẾNG ANH - FORM MỚI 2025 - 40 CÂU HỎI - BÙI VĂN V...
31 ĐỀ THI THỬ VÀO LỚP 10 - TIẾNG ANH - FORM MỚI 2025 - 40 CÂU HỎI - BÙI VĂN V...Nguyen Thanh Tu Collection
 
Geoffrey Chaucer Works II UGC NET JRF TGT PGT MA PHD Entrance Exam II History...
Geoffrey Chaucer Works II UGC NET JRF TGT PGT MA PHD Entrance Exam II History...Geoffrey Chaucer Works II UGC NET JRF TGT PGT MA PHD Entrance Exam II History...
Geoffrey Chaucer Works II UGC NET JRF TGT PGT MA PHD Entrance Exam II History...DrVipulVKapoor
 
4.9.24 Social Capital and Social Exclusion.pptx
4.9.24 Social Capital and Social Exclusion.pptx4.9.24 Social Capital and Social Exclusion.pptx
4.9.24 Social Capital and Social Exclusion.pptxmary850239
 
Vinícius Portella In Media Res Media Component
Vinícius Portella In Media Res Media ComponentVinícius Portella In Media Res Media Component
Vinícius Portella In Media Res Media ComponentInMediaRes1
 
Q-Factor General Quiz-7th April 2024, Quiz Club NITW
Q-Factor General Quiz-7th April 2024, Quiz Club NITWQ-Factor General Quiz-7th April 2024, Quiz Club NITW
Q-Factor General Quiz-7th April 2024, Quiz Club NITWQuiz Club NITW
 
Healthy Minds, Flourishing Lives: A Philosophical Approach to Mental Health a...
Healthy Minds, Flourishing Lives: A Philosophical Approach to Mental Health a...Healthy Minds, Flourishing Lives: A Philosophical Approach to Mental Health a...
Healthy Minds, Flourishing Lives: A Philosophical Approach to Mental Health a...Osopher
 
Tree View Decoration Attribute in the Odoo 17
Tree View Decoration Attribute in the Odoo 17Tree View Decoration Attribute in the Odoo 17
Tree View Decoration Attribute in the Odoo 17Celine George
 
Objectives n learning outcoms - MD 20240404.pptx
Objectives n learning outcoms - MD 20240404.pptxObjectives n learning outcoms - MD 20240404.pptx
Objectives n learning outcoms - MD 20240404.pptxMadhavi Dharankar
 

Recently uploaded (20)

Transdisciplinary Pathways for Urban Resilience [Work in Progress].pptx
Transdisciplinary Pathways for Urban Resilience [Work in Progress].pptxTransdisciplinary Pathways for Urban Resilience [Work in Progress].pptx
Transdisciplinary Pathways for Urban Resilience [Work in Progress].pptx
 
The Emergence of Legislative Behavior in the Colombian Congress
The Emergence of Legislative Behavior in the Colombian CongressThe Emergence of Legislative Behavior in the Colombian Congress
The Emergence of Legislative Behavior in the Colombian Congress
 
6 ways Samsung’s Interactive Display powered by Android changes the classroom
6 ways Samsung’s Interactive Display powered by Android changes the classroom6 ways Samsung’s Interactive Display powered by Android changes the classroom
6 ways Samsung’s Interactive Display powered by Android changes the classroom
 
Employablity presentation and Future Career Plan.pptx
Employablity presentation and Future Career Plan.pptxEmployablity presentation and Future Career Plan.pptx
Employablity presentation and Future Career Plan.pptx
 
CHUYÊN ĐỀ ÔN THEO CÂU CHO HỌC SINH LỚP 12 ĐỂ ĐẠT ĐIỂM 5+ THI TỐT NGHIỆP THPT ...
CHUYÊN ĐỀ ÔN THEO CÂU CHO HỌC SINH LỚP 12 ĐỂ ĐẠT ĐIỂM 5+ THI TỐT NGHIỆP THPT ...CHUYÊN ĐỀ ÔN THEO CÂU CHO HỌC SINH LỚP 12 ĐỂ ĐẠT ĐIỂM 5+ THI TỐT NGHIỆP THPT ...
CHUYÊN ĐỀ ÔN THEO CÂU CHO HỌC SINH LỚP 12 ĐỂ ĐẠT ĐIỂM 5+ THI TỐT NGHIỆP THPT ...
 
Mattingly "AI & Prompt Design" - Introduction to Machine Learning"
Mattingly "AI & Prompt Design" - Introduction to Machine Learning"Mattingly "AI & Prompt Design" - Introduction to Machine Learning"
Mattingly "AI & Prompt Design" - Introduction to Machine Learning"
 
Scientific Writing :Research Discourse
Scientific  Writing :Research  DiscourseScientific  Writing :Research  Discourse
Scientific Writing :Research Discourse
 
Grade Three -ELLNA-REVIEWER-ENGLISH.pptx
Grade Three -ELLNA-REVIEWER-ENGLISH.pptxGrade Three -ELLNA-REVIEWER-ENGLISH.pptx
Grade Three -ELLNA-REVIEWER-ENGLISH.pptx
 
Farrington HS Streamlines Guest Entrance
Farrington HS Streamlines Guest EntranceFarrington HS Streamlines Guest Entrance
Farrington HS Streamlines Guest Entrance
 
31 ĐỀ THI THỬ VÀO LỚP 10 - TIẾNG ANH - FORM MỚI 2025 - 40 CÂU HỎI - BÙI VĂN V...
31 ĐỀ THI THỬ VÀO LỚP 10 - TIẾNG ANH - FORM MỚI 2025 - 40 CÂU HỎI - BÙI VĂN V...31 ĐỀ THI THỬ VÀO LỚP 10 - TIẾNG ANH - FORM MỚI 2025 - 40 CÂU HỎI - BÙI VĂN V...
31 ĐỀ THI THỬ VÀO LỚP 10 - TIẾNG ANH - FORM MỚI 2025 - 40 CÂU HỎI - BÙI VĂN V...
 
Geoffrey Chaucer Works II UGC NET JRF TGT PGT MA PHD Entrance Exam II History...
Geoffrey Chaucer Works II UGC NET JRF TGT PGT MA PHD Entrance Exam II History...Geoffrey Chaucer Works II UGC NET JRF TGT PGT MA PHD Entrance Exam II History...
Geoffrey Chaucer Works II UGC NET JRF TGT PGT MA PHD Entrance Exam II History...
 
4.9.24 Social Capital and Social Exclusion.pptx
4.9.24 Social Capital and Social Exclusion.pptx4.9.24 Social Capital and Social Exclusion.pptx
4.9.24 Social Capital and Social Exclusion.pptx
 
Chi-Square Test Non Parametric Test Categorical Variable
Chi-Square Test Non Parametric Test Categorical VariableChi-Square Test Non Parametric Test Categorical Variable
Chi-Square Test Non Parametric Test Categorical Variable
 
Vinícius Portella In Media Res Media Component
Vinícius Portella In Media Res Media ComponentVinícius Portella In Media Res Media Component
Vinícius Portella In Media Res Media Component
 
Q-Factor General Quiz-7th April 2024, Quiz Club NITW
Q-Factor General Quiz-7th April 2024, Quiz Club NITWQ-Factor General Quiz-7th April 2024, Quiz Club NITW
Q-Factor General Quiz-7th April 2024, Quiz Club NITW
 
Healthy Minds, Flourishing Lives: A Philosophical Approach to Mental Health a...
Healthy Minds, Flourishing Lives: A Philosophical Approach to Mental Health a...Healthy Minds, Flourishing Lives: A Philosophical Approach to Mental Health a...
Healthy Minds, Flourishing Lives: A Philosophical Approach to Mental Health a...
 
Tree View Decoration Attribute in the Odoo 17
Tree View Decoration Attribute in the Odoo 17Tree View Decoration Attribute in the Odoo 17
Tree View Decoration Attribute in the Odoo 17
 
Objectives n learning outcoms - MD 20240404.pptx
Objectives n learning outcoms - MD 20240404.pptxObjectives n learning outcoms - MD 20240404.pptx
Objectives n learning outcoms - MD 20240404.pptx
 
CARNAVAL COM MAGIA E EUFORIA _
CARNAVAL COM MAGIA E EUFORIA            _CARNAVAL COM MAGIA E EUFORIA            _
CARNAVAL COM MAGIA E EUFORIA _
 
Introduction to Research ,Need for research, Need for design of Experiments, ...
Introduction to Research ,Need for research, Need for design of Experiments, ...Introduction to Research ,Need for research, Need for design of Experiments, ...
Introduction to Research ,Need for research, Need for design of Experiments, ...
 

Introduction.pptx

  • 1. SOFTWARE Software is a set of instructions, data or programs used to operate computers and execute specific tasks. Software instructions tells a computer what to do.
  • 3. SYSTEM SOFTWARE Operating System: manages all the resources such as memory, CPU, printer, hard disk, etc., and provides an interface to the user, which helps the user to interact with the computer system. Examples of operating systems are Linux, Apple macOS, Microsoft Windows, etc. Language Processor: converts programs written in high-level programming languages like Java, C, C++, Python, etc (known as source code), into sets of instructions that are easily readable by machines(known as object code or machine code). Device Driver: A device driver is a program or software that controls a device and helps that device to perform its functions. Every device like a printer, mouse, modem, etc. needs a driver to connect with the computer system eternally.
  • 4. SYSTEM SOFTWARE System software is computer software designed • to operate and control the computer hardware • to provide a platform for running application software.
  • 5. SYSTEM SOFTWARE System software consists of a variety of programs that support the operation of a computer • Assembler • Linker • Loader • Macro processor • Text editor • Debugger • File System • Database
  • 6. SYSTEM SOFTWARE The role of Systems Software –interface between users, application software and hardware
  • 7. APPLICATION SOFTWARE • Application software, also known as an application. • Application is computer software designed to help the user to perform specific tasks. • Examples include enterprise software, accounting software, and graphics software and media players.
  • 8. Difference between System Software and Application Software System Software Application Software System software consists of a variety of programs that support the operation of a computer. for example operating system, assembler, loader, linker, and microprocessor and text editor. Application software is a set of one or more programs, designed to solve a specific problem. for example employee management system, bank management system, and media player. System software is system dependent application software is not a system dependent system software works directly with the hardware application software works directly with the system software. system software are written in machine or assembly languages. variety of programming languages can be used to write application software, such as C , Java and .NET
  • 9. Types of System Software  Compiler  Assembler  Linker  Loader  Macro processor  Text editor  Debugger  File System  Database
  • 10. Compiler The compiler is software program that converts a program written in a high- level language (Source Language like C, C++, Java) to low-level language (Machine Language).
  • 11. COMPILER TYPES Cross Compiler: that runs on a machine ‘A’ and produces a code for another machine ‘B’. It is capable of creating code for a platform other than the one on which the compiler is running. Source-to-source Compiler or transcompiler or transpiler: is a compiler that translates source code written in one programming language into the source code of another programming language.
  • 12. COMPILER TYPES Incremental Compilers: is a compiler, which executes the recompilation of only a changed source instead of compiling the complete source code. Single-Pass Compiler: Single pass compiler reads the code only once and then translates it. The one-pass compiler passes only once through the parts of each compilation unit. Multi-Pass Compiler: A multi-pass compiler can process the source code of a program multiple times. • In the first pass, the compiler can read the source code, scan it, extract the tokens and save the result in an output file. • In the second pass, the compiler can read the output file produced by the first pass, produces machine code.
  • 13. Assembler Assembly Level language Machine level language program program Assembler
  • 14. Data Structures Pass 1 Pass 2 Intermediate file Object program Source program OPTAB SYMTAB LOCCTR • Operation Code Table (OPTAB) • Symbol Table (SYMTAB) • Location Counter (LOCCTR)
  • 15. Load-and-Go Assembler • Load-and-go assembler generates their object code in memory for immediate execution. • No object program is written out, no loader is needed.
  • 17. Linker Object File 1 Object File 2 Object File 3 Executable File
  • 19. 200 Prog A 201 A=10 202 B=20 203 C=[201]+[202] 204 End LOADER 200 201 202 203 204 205 206 207 208 209 210 Prog A 211 A=10 212 B=20 213 c=[201]+[202] 214 End 215 Secondary memory Main memory
  • 20. Reason for Program Relocation • To increase the efficiency of the machine • Want to load and run several programs at the same time (multiprogramming) • Must be able to load programs into memory wherever there is room • Actual starting address of the program is not known until load time
  • 21. Processes to Run an Object Program • Loading – Brings object program into memory • Relocation – Modifies the object program where absolute addresses are specified • Linking – Combines two or more separate object programs and supplies information needed to allow cross- references. Absolute loader Loader Linking loader Linker
  • 22.
  • 23. Macro processor Source Code (with macro) Expanded Source Code Macro processor
  • 24. Macro Processor • Recognize macro definitions • Save the macro definition • Recognize macro calls • Expand macro calls Source Code (with macro) Macro Processor Expanded Code Compiler or Assembler obj
  • 25. Copy code -- Example Source STRG MACRO STA DATA1 STB DATA2 STX DATA3 MEND . STRG . STRG . . Expanded source . . . STA DATA1 STB DATA2 STX DATA3 . STA DATA1 STB DATA2 STX DATA3 . { {
  • 26. Text editor A text editor is a type of program used for editing plain text files. Editors or text editors are software programs that enable the user to create and edit text files. Windows: Notepad, WordPad UNIX OS: vi, emacs, Jed, Pico
  • 27. Text editor Types of Editors Line editor: you can only edit one line at a time or an integral number of lines. Ex : Teleprinter, edlin, teco Stream editors: the file is treated as continuous flow or sequence of characters instead of line numbers, which means here you can type paragraphs. Ex : Sed editor in UNIX Screen editors: the user is able to see the cursor on the screen and can make a copy, cut, paste operation easily. It is very easy to use mouse pointer. Ex : vi, emacs, Notepad Word Processor: it allows one to use some format to insert images, files, videos, use font, size, style features. Structure Editor: Structure editor focuses on programming languages. It provides features to write and edit source code. Ex : Turbo C, Netbeans IDE
  • 28. Debugger A debugger or debugging tool is a computer program that is used to test and debug other programs. • Break points • Watch window
  • 29. Previous Year Questions 5. The language which a computer can understand is a. high level language b. assembly language c. machine language d. all of the above
  • 30. Previous Year Questions 5. The language which a computer can understand is a. high level language b. assembly language c. machine language d. all of the above
  • 31. Previous Year Questions 11. A linker a. is a software programme b. combines part of a programme c. is a programme used to load monitor into main memory d. Both (a) and (b)
  • 32. Previous Year Questions 11. A linker a. is a software programme b. combines part of a programme c. is a programme used to load monitor into main memory d. Both (a) and (b)
  • 33. Previous Year Questions 15. An assembler in a computer system prepares a. machine-language programme from a symbolic language programme b. object programme c. assembles computer instructions and data in the machine d. None of these
  • 34. Previous Year Questions 15. An assembler in a computer system prepares a. machine-language programme from a symbolic language programme b. object programme c. assembles computer instructions and data in the machine d. None of these
  • 35. Previous Year Questions 20. Which one of the following is not system software a. MS DOS b. UNIX C. Windows d. JAVA
  • 36. Previous Year Questions 20. Which one of the following is not system software a. MS DOS b. UNIX C. Windows d. JAVA
  • 37. Previous Year Questions 67 An 'Assembler' for microprocessor is used for a. assembly of processors in a production line b. creation of new programs using different modules c. translation of a program from assembly language to machine language d. Translation of a higher-level language into English text.
  • 38. Previous Year Questions 67 An 'Assembler' for microprocessor is used for a. assembly of processors in a production line b. creation of new programs using different modules c. translation of a program from assembly language to machine language d. Translation of a higher-level language into English text.