Functions of Operating system – Operating system performs three functions:
- Convenience: An OS makes a computer more convenient to use.
- Efficiency: An OS allows the computer system resources to be used in an efficient manner.
- Ability to Evolve: An OS should be constructed in such a way as to permit the effective development, testing and introduction of new system functions without at the same time interfering with service.
Operating system as User Interface –
- User
- System and application programs
- Operating system
- Hardware
Every general purpose computer consists of the hardware, operating system, system programs, and application programs. The hardware consists of memory, CPU, ALU, and I/O devices, peripheral device and storage device. System program consists of compilers, loaders, editors, OS etc. The application program consists of business programs, database programs.
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