Structures and Unions in C++ MCQ question and answer with solution

1

What is a structure in C++?

A) A collection of functions B) A reserved keyword in C++ C) A user-defined data type containing variables of different data types D) A way to declare arrays of data

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Answer: Option C

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2

Which keyword is used to define a structure in C++?

A) typedef B) struct C) union D) None of the above

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Answer: Option B

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3

What is the correct way to access members of a structure in C++?

A) Using the star operator B) Using the double colon operator C) Using the dot operator D) Using the arrow operator

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Answer: Option C

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4

What is the purpose of typedef in C++ structures?

A) To define a new structure B) To initialize structure members C) To create a pointer to a structure D) To create an alias for data types

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Answer: Option D

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5

How do you declare a structure variable in C++?

A) structName variableName; B) struct variableName; C) variableName structName; D) variableName = structName;

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Answer: Option A

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6

What is the output of the following code: struct Student { int roll; }; Student s1; s1.roll = 101; cout << s1.roll; in C++?

A) Undefined behavior B) 0 C) Compilation error D) 101

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Answer: Option D

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7

What is the purpose of using structures in C++?

A) To perform mathematical operations B) To define loops in the program C) To group related data together D) To represent true/false values

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Answer: Option C

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8

What is the correct way to pass a structure to a function in C++?

A) By value B) By reference C) By pointer D) All of the above

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Answer: Option D

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9

What is a union in C++?

A) A reserved keyword in C++ B) A user-defined data type that allows storing different data types in the same memory location C) A way to declare arrays of data D) None of the above

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Answer: Option B

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10

What is the difference between a structure and a union in C++?

A) Structures cannot contain member functions B) Unions are used for mathematical operations C) In a structure, each member has its own memory space, while in a union, all members share the same memory space D) Structures are used for data organization

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Answer: Option C

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Structures and Unions in C++ MCQ question and answer with solution | C++ Programimg MCQs