The most important reason we should make a backup of our files on a USB or other device is in case our computer suddenly dies. If something in it goes bad and it stops working, you will have then lost everything on your computer. But, if you make a save, you can buy another computer and upload everything onto the new one.
Answer:
Lexical rules that are defined in case of regular grammar are simple and the notation is quite easy to understand.
Regular expression are useful for defining constructs of identifiers or constants. e.g. a|b etc.
In the case of context-free, grammar is not simple and deals with the productions.
Context-free are useful in describing the nested constructs like if-else etc which are not defined by regular expressions.
These produce a higher level of reliability as it provides a medium for generating syntactical as well as semantic data. The grammar is context-free is a little complex.
Explanation:
Types of operating systems
The three most common operating systems for personal computers are Microsoft Windows, macOS, and Linux.
