Question

Find the invalid identifier from the following

a) MyName b) True c) 2ndName d) My_Name
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Answer 1

2ndName (Option C)

Explanation:

• Identifier is used to give names to the variables, functions, unions, structures, enums etc..
• Identifiers should be unique, they should not match with the key words.
• A identifier can contain alphabets (Upper or lower case), numbers, a special character underscore ( _ ).
• The first letter of an identifier should be a alphabet or underscore. A number cannot be the first letter of the identifier.
• But in option C, the first letter is 2, which is a number.
• So, it is a invalid identifier.

Therefore, option C is correct answer.