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

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

Which of the following two statements are valid? Why? Also write their result.
int a;
(i) int a; a = 3,014;
(ii) int a; a=(3,014);

What will be the result of following if num=6 initially.
(a) cout << num;
(b) cout << (num == 5);

Determine which of the following are valid constant? And specify their type.
(i) 0.5
(ii) ‘Name’
(iii) ‘\t’
(iv) 27,822

What is the difference between 56L and 56?

What is a reference variable? What is its use?

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Answers Key:

Generic 2

5 x 2 = 10

(i) It is invalid as comma is not allowed in an integer constant.
(ii) It is valid, Comma in bracket is allowed.

(a) 6
(b) False

(i) 0.5-is a valid constant. It is a decimal
(ii) 'Name' - Invalid constant as single quote is not allowed.
(iii) \t'- Escape sequence (or) non-graphical character (horizontal tab)
(iv) 27,822 - Invalid constant. Comma is not allowed

56L- The suffix L forces the constant to be represented as long, which occupies 4 bytes.
56- This will be represented as int type constant which occupies 2 bytes as per Turbo C++.

Reference variable in C++ is alias for existing variable. They store nothing but the address of the variable used at the time of its declaration. It is important to assign the reference variable at the time of declaration, else it will show an error.