C Identifiers

C Identifiers are names given to different entities such as constants, variables, structures, functions, etc. This tutorial describes C Identifiers.

Example:

int amount;

double totalbalance;

In the above example, amount and totalbalance are identifiers, and int and double are keywords.

Rules for Naming Identifiers

• An identifier can only have alphanumeric characters (a-z , A-Z , 0-9) (i.e. letters and digits) and underscore( _ ) symbol.
• Identifier names must be unique.
• The first character must be an alphabet or underscore.
• You cannot use a keyword as an identifier.
• Only the first thirty-one (31) characters are significant.
• It must not contain white spaces.
• Identifiers are case-sensitive.

Identifiers in C - Video Tutorial

Please watch this video tutorial to understand "C Identifiers" in more depth.