The document provides an overview of keywords and identifiers in C++, detailing their definitions and rules for usage. It explains that keywords are reserved words with special meanings, while identifiers are user-defined names for variables or functions. An example is given to illustrate the identification of valid and invalid identifiers.

2. GET 100% MARKS IN
COMPUTER SCIENCE
FIRST QUESTION
COMPUTER SCIENCE
BOARD EXAM

3. IDENTIFY THE CORRECT
IDENTIFIERS/KEYWORD
EXAM WEIGHTAGE-2 MARKS

4. KEYWORDS
•KEYWORDS ( also known as specially reserved words)
CONVEYS A SPECIAL MEANING TO COMPILER.
• KEYWORDS are always typed in short(lower) case.
•They are reserved by the language for special purpose
and can’t be redefined(USED) as an IDENTIFIER.

5. IDENTIFIERS
•IDENTIFIERS ARE THE NAMES GIVEN
BY THE PROGRAMMER TO DIFFERENT
BLOCKS, PARTS OF A PROGRAM TO
IDENTIFY THEM.

6. RULES/CONVENTIONS
FOR DEFINING IDENTIFIERS
•It can contain characters(A-Z, a-z),Digits(0-9), & only
one special symbol called underscore(_).
•First letter must be a character (A-Z, a-z) or
underscore(_).
•No commas or blank spaces allowed.
•Keywords can’t be used as an identifier.

7. Q1. Find the correct identifiers out of the following, which can be used for naming Variable,
Constants or Functions in a C++ program:
For, while, INT, NeW, delete, 1stName, Add+Subtract, name1
ANS.)
For, INT, NeW, name1
EXAMPLE 2

8. Q1. (a) Write the type of C++ tokens (keywords and user defined identifiers) from the following
(i) For (ii) delete
(iii) default (iv) Value
ANS.)
For – Identifier
delete – keyword
default- Keyword
Value- Identifier
EXAMPLE 1

9. THANKS FOR WATCHING MY VIDEO
EMAIL : theaakashkumar@gmail.com