C Identifiers and Operators with Examples

An identifier is use for any variable, constants, functions, structures, pointers, arrays, structures, unions, labels, or any other user-define data, to identify them. An identifier can be compose of letters just like uppercase, lowercase letters, underscore, digits. The starting letter should be either an alphabet or an underscore only. It can not start with a digit. There are 52 alphabetical characters (uppercase and lowercase), underscore character, and 10 numerical digits (0-9) that represent the identifiers. There is a total of 63 alphanumerical characters that represent the identifiers is knows as C Identifier