What are identifiers? What are the rules for naming a identifier? Give examples.

1 year ago
C Programming

Identifier is used to name various elements of program such as variables, constants, functions, arrays, functions etc. An identifier is a word consisting of sequence of Letters, Digits or _(underscore).

Rules to Name identifiers are

  1. The variables must always begin with a letter or underscore as the first
  2. The following letters can be any number of letters, digits or underscore.
  3. Maximum length of any identifier is 31 characters for external names or 63 characters for local
  4. Identifiers are case Ex. Rate and RaTe are two different identifiers.
  5. The variable name should not be a
  6. No special symbols are allowed except underscore. Examples:

Valid identifiers:

Sum                 roll_no            _name                        sum_of_digits avg_of_3_nums

Invalid Identifiers and reason for invalid:

$roll_no          -           Name doesnβ€Ÿt begin with either letter or underscore

for                   -           keyword is used as name

sum,1              -           special symbol comma is not allowed

3_factorial        -           name begins with digit as first letter

Sanisha Maharjan
Jan 20, 2022
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