Kerala Plus One Computer Science Chapter Wise Previous Questions Chapter 5 Introduction to C++ Programming
Question 1.
Mention the purpose of tokens in C++. Write names of any four tokens in C++. (March – 2015)
Answer:
Token : It is the smallest individual units similar to a word in English or Malayalam language. C++ has 5 tokens.
1) Keywords
2) Identifier
3) Literals (Constants)
4) Punctuators
5) Operators
Question 2.
The following are some invalid identifiers. Specify its reason. (Say – 2015)
a) Sum of digits
b) 1 year
c) First jan
d) For
Answer:
a) Sum of digits → space not allowed hence it is invalid
b) 1 year → First character must be an alphabet hence it is invalid
c) First.jan → special characters such as dot (.) not allowed hence it is invalid.
d) For – It is valid. That is it is not the key word for
Question 3.
Some of the literals in C++ are given below. How do they differ? (5, ‘5’, 5.0, “5”) (Say – 2015)
Answer:
5 – integer literal
‘5’ – Character literal
5.0- floating point literal
“5”- string literal
Question 4.
Which one of the following is a user-defined name? (Say – 2016)
a) Key-word
b) Identifier
c) Escape sequences
d) All of these
Answer:
b) Identifier
Question 5.
Identify whether the following are valid identifiers or not? If not give the reason. (Say – 2016)
a) Break
b) Simple. interest
Answer:
a) Break – It is valid( break is the keyword, not Break);
b) Simple.interest – It is not valid, because dot(.) is used.
Question 6.
Identify the invalid literals from the following and write a reason for each: (March – 2017)
a) 2E3.5
b) “9”
c) ‘hello’
d) 55450
Answer:
a) Invalid, because exponent part should not be a floating-point number
b) valid