Identifiers and Keyword in C

 

Identifier:

A symbolically assigned name for an entity, such as a variable, data type, function, array, etc., is known as an identifier. It must be special. It is a straightforward series of alphabetic characters or numerals that must always begin with an alphabet. It does not permit the use of punctuation, spaces, or signs. An identifier's length is unrestricted, but you must tell the compiler what it should be in ahead.

Ex: valid identifier : area,volume,tax,h42,sum,etc.

     invalid identifier: area of circle,x+y,3ab,etc

 

Keyword:

Keywords are words that have previously been clarified to the compiler as to their meaning. Because the C compiler forbids giving a keyword a new meaning, it cannot be used as a variable word. The term "keyword" also applies to reserved words.

There are only 32 keyword in C language. They are as follow: