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11th Standard English Medium Computer Science Subject Introduction To C++ Book Back 2 Mark Questions with Solution Part - I

Published on: 09/06/2021

QB365 provides detailed and simple solution for every book back questions in class 11 Computer Science subject.It will helps to get more idea about question pattern in every book back questions with solution.

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Std: 11th Standard - Computer Science

chapter: - Book back Questions

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Questions:

Generic 2

5 x 2 = 10

Assume n=10; what will be result of n++ and --n;?

Write the following real constants into the exponent form:
(i) 23.197
(ii) 7.214
(iii) 0.00005
(iv) 0.319

The following constants are of which type?
(i) 39
(ii) 032
(iii) 0XCAFE
(iv) 04.14

What are keywords? Can keywords be used as identifiers?

What is meant by a token? Name the token available in C++.

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Answers Key:

Generic 2

5 x 2 = 10

Operator	Operation	Result
>>	n >> 2	00001010 n = 10
		00001000 n >> 2
		00000010
n >> 2 = (00000010)₂ = 2₁₀

(i) \(23.197=0.23197 \times 10^2=0.23197 \mathrm{E} 2\)
(ii) \(7.214=0.7214 \times 10^1=0.7214 \mathrm{E} 1\)
(iii) \(0.00005=0.5 \times 10^{-4}=0.5 \mathrm{E}-4\)
(iv) \(0.319=3.19 \times 10^{-1}=3.19 \mathrm{E}-1\)

(i) 39 - Decimal
(ii) 032 - Octal
(iii) 0XCAFE - Hexadecimal
(iv) 04.14 - Decimal

Keywords are the reserved words which convey specific meaning to the C++ compiler. They are the essential elements to construct C++ programs. Most of the keywords are common to C, C++ and Java. Keywords are reserved and cannot be used as identifiers.

C++ program statements are constructed by many different small elelments such as commands, variables, constants and many more symbols called as operators and punctuators. Individual elements are collectively called as Lexical units or Lexical elements or Tokens. C++ has the following tokens:
(i) Keywords
(ii) Identifiers
(iii) Literals
(iv) Operators
(v) Punctuators