Question

rules for keywords in c​

Answer 1

C language identifiers are the names given to variables, constants, functions and user-define data. These identifier are defined against a set of rules.

...

Character set

Letters(all alphabets a to z & A to Z).

Digits (all digits 0 to 9).

Special characters, ( such as colon : , semicolon ; , period . ...

White spaces.

Answer 2

There is no rules for keywords in C or any programming language.

keyword are reserved by the compiler you can't modify it or use it as identifier.

But,you can say there is a rules for identifier:-

Identifier:- term that is used to define name for variable, function or const datatype.

• first character must be underscore or letter
• not special symbol except underscore.
• can't use reserved keyword as identifier.
• identifier are case sensitive.