Question

how many types of operating system ? name them ......

Answer 1

there are commonly nine types of operating system they are  :-
 - real time operating system 
  - multitasking operating system 
  - multiprocessing OS
  -  multi- access OS
  - time sharing OS
  -  multi programming OS
  - batch processing  operating system 
  - single user - multi tasking OS 
   - single user - single task OS

  

Answer 2

REALTIME OS , SINGLE USER - MULTITASKINH OS , SINGLE USER - SINGLE TASKING OS , BATCH PROCESSING OS , MULTITASKING OPERATING SYSTEM , TIMESHARING OS , MULTIPROCESSING OS ..