Structure and Union - C Programming MCQ Questions and Answers

1

What is the keyword used to define a structure in C?

A) struct B) record C) class D) object

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Answer & Solution

Answer: Option A

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2

In a structure, what are the members also known as?

A) Variables B) Properties C) Objects D) Elements

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Answer & Solution

Answer: Option A

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3

Which of the following can be a member of a structure?

A) Function B) Another structure C) Enumeration D) All of the above

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Answer & Solution

Answer: Option B

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4

How do you access a member of a structure in C?

A) . (dot) B) -> (arrow) C) :: (scope) D) , (comma)

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Answer & Solution

Answer: Option A

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5

Which keyword is used to declare a union in C?

A) struct B) union C) class D) typedef

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Answer & Solution

Answer: Option B

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6

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

A) Structure allows nested members B) Union allows nested members C) Structure allows multiple members D) Union allows only one active member

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Answer & Solution

Answer: Option D

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7

How is the size of a structure determined in C?

A) By the total size of its members B) By the size of its largest member C) By the size of its smallest member D) By the number of members

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Answer & Solution

Answer: Option B

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8

Which statement correctly defines a structure named "Person" with members "name" and "age" of type char* and int respectively?

A) struct Person { char* name; int age; } B) struct Person { name, age; } C) struct { name; age; } Person; D) struct { char* name, int age; } Person;

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Answer & Solution

Answer: Option A

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9

What does the 'sizeof' operator in C return for a union?

A) Total size of all union members B) Size of the largest member C) Size of the smallest member D) Size of the union itself

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Answer & Solution

Answer: Option B

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10

Can a structure have another structure as a member in C?

A) No, it's not allowed B) Yes, but with a limited depth C) Yes, without any limitations D) Only if the inner structure is named "Inner"

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Answer & Solution

Answer: Option C

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