Operating System

WHAT IS AN OPERATING SYSTEM ?

An operating system is a program, which is act as interface between the computer hardware and the actual user of computer and control the execution of program. An operating system is an integrated set of programs that is used to manage the resources and overall operations of a computer. It not only support the computer installation but the prime objective of OS is to improve the performance and efficiency of a computer system and increase a facility of a computer, the ease with which the a system can be used. Operation system is responsible for the smooth and efficient operations of a computer system. MS-DOS, Microsoft Windows , IBM OS/2 is the examples of Operation Systems.

TYPES OF OPERATING SYSTEM:

Operating system is divide into two categories :

1. Single User Operating System.
2. Multi User Operating System.

SINGLE USER OPERATING SYSTEM:

- In this case, CPU performs only one job at a time i.e at any instant only one user can work on the machine, and only one program can be loaded into the memory. MS DOS is the example of Single User Operating System.

MULTI USER OPERATING SYSTEM:

- In this case, CPU performs multiple jot at a time , multiple users can work on a single machine and multiples program can be load into the memory , Windows is the example of Multi User Operating System.

FUNCTIONS OF OPERATING SYSTEM:

Operating System performs the following functions.

1. Processor Management : Assignment of processor to the different task performs by the system.

2. Memory Management : Allocation of main memory and other storage area to the system programs as well as user programs and data.

3. Input/Output Management : Co-ordination and assignment of the I/O devices while one or more programs are being execution.

4. File Management: Storage of files on various storage devices and transfer of these files from one storage device to another storage device.

5. Command Interpreter : Interpretations of command and instruction.

SEQUENCE OF STEPS FOR EXECUTION OF PROGRAM BY AN OPERATING SYSTEM.

When a program is written and execute , the following sequence of steps performed by an OS.

1. The compiler specific to the program is loaded into the memory.

2. The source program is read and loaded into the memory.

3. The source program is compiled into the object code, while compiling and syntax error are detected the programs appropriate messages are printer. 

4. The object program is executed.

This article is about the OS , hope You like it , Thank You for Visiting!