C Identifiers (JNNC Technologies)

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

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 & digits) and underscore( _ ) symbol.
• Identifier names must be unique
• The first character must be an alphabet or underscore.
• You cannot use a keyword as identifiers.
• Only first thirty-one (31) characters are significant.
• Must not contain white spaces.
• Identifiers are case-sensitive.