Identifiers in C
Identifier define to name given to entities such as variables, functions, structures etc.
See in Example.
Here a and accountBalance is identifiers.
Here int is keyword
Rules for Identifiers
- An identifier can have letters (both uppercase and lowercase letters), digits and underscores..
- The first letter of an identifier should be either a letter or an underscore.
- Commas or blank spaces cannot be specified within an identifier.
- Keywords cannot be represented as an identifier.
Differences between Keyword and Identifier
|Keyword is a pre-defined word.
||The identifier is a user-defined word
|It must be written in a lowercase letter.
||It can be written in both lowercase and uppercase letters.
|Its meaning is pre-defined in the c compiler.
||Its meaning is not defined in the c compiler.
|It is a combination of alphabetical characters.
||It is a combination of alphanumeric characters.
|It does not contain the underscore character.
||It can contain the underscore character.
Value of a is : 5
Value of A is :10