Operating system

Operating system is a program that acts as an intermediately between a user of a computer and the computer hardware.

Purpose:

The purpose is to provide an environment in which user can execute their program.

1. Primary goal is to make computer system convenient to use.
2. To use the computer hardware in effective manner.

Components of Operating system:

A computer system can be divided into four components.

1. Hardware
2. Operating system
3. Application Program
4. Users 

Hardware: (provides the basic computing resources)

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               I.      Central Processing Unit (CPU)

            II.      Memory

         III.      I/O Devices
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Application Program:

Operating system controls and coordinates the use of H/W among the various application programs for the various users.

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             I.      Compiler

          II.      Data base system

       III.      Games and Business Programs

Resources Allocator:

Computer system has many resources

             I.      H/W and S/W

          II.      CPU Time

       III.      Memory Space

       IV.      File Storage Device

          V.      I/O Devices

Operating system acts as the manager of these resources and allocates them to specific program and users to perform specific task.

Control Program:

A control program controls the execution of user program to prevent errors and improper use of the computer.