1. Types and components of a computer system
Types of system software

2. compiler
Translates a program written in a high level language into machine code.
Program/ source code
High level language
Machine code
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2/16/2019

3. Program
A computer program is a collection of instructions that performs a specific task when executed by a computer
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2/16/2019

4. High level language
A high-level language is a programming language that enables a programmer to write programs that are more or less independent of a particular type of computer. Such languages are considered high-level because they are closer to human languages and further from machine languages.
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2/16/2019

5. Example source code This is a snippet of high level code
sale price = 1.23
if (sale price > 2)
{ discount = 0.1 }
else
{ discount = 0.05 }
Even if you do not know the precise details of this particular high level language, it is fairly easy to follow what is going on. High level code is written as text and is called 'source code'
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2/16/2019

6. Machine code
Code understood by computer
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7. LINKER
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8. linker
Also called link editor and binder, a linker is a program that combines object modules to form an executable program.
Many programming languages allow you to write different pieces of code, called modules, separately.
This simplifies the programming task because you can break a large program into small, more manageable pieces.
Eventually, though, you need to put all the modules together. This is the job of the linker.
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10. Device Driver Enable hardware to communicate with Operating system.
Tells how to work
How to troubleshoot
A device driver is a program that controls a particular type of device that is attached to your computer.
There are device drivers for printers, displays, CD-ROM readers, diskette drives, and so on
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12. Operating System Essential software running in background.
Manages computer functions
Without it, computer will be user-unfriendly
It allows (functions)
I/O operations
Users to communicate with computer
Error handling
Loading and running of programs
Security management. (user accounts, passwords etc)
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16. Utilities Software to carry out specific tasks on a computer.
Help to manage, maintain and control computer resources.
Antivirus
Anti-spyware
Backup of files
Disk repair
File management
Security
Screensavers
Disk defragmenter.
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