Tokens, keywords, identifiers, and constants — C++ MCQ

1. Which of the following is not a keyword in C++?
(A) int
(B) float
(C) main
(D) return

2. Which of the following is a valid identifier in C++?
(A) 2variable
(B) my_var
(C) class
(D) #count

3. Which of the following is a valid constant in C++?
(A) 123
(B) variable1
(C) myVar
(D) int

4. Which of the following is considered a token in C++?
(A) if
(B) myVariable
(C) +
(D) All of the above

5. What is the maximum length of an identifier in C++?
(A) 31 characters
(B) 63 characters
(C) Implementation-dependent
(D) 255 characters

6. Which of the following is a floating-point constant in C++?
(A) 12
(B) 12.5
(C) 'A'
(D) true

7. Which of the following cannot be used as an identifier in C++?
(A) myVar
(B) _count
(C) int
(D) var123

8. Which of the following is a character constant in C++?
(A) "A"
(B) 'A'
(C) 65
(D) A

9. What type of token is ++ in C++?
(A) Keyword
(B) Operator
(C) Identifier
(D) Constant

10. Which of the following is not allowed in an identifier?
(A) Alphabet
(B) Digit (except at the start)
(C) Underscore
(D) Space