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.
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