Structure and Union - C Programming MCQ Questions and Answers

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Each section contains 100 MCQs on Structure and Union .

Which operator is used to access a union member when the union is a part of a structure?

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

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Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

What happens when you assign a value to one member of a union and then access another member in C?

A) It's allowed and safe B) It leads to undefined behavior C) It raises a compilation error D) It swaps the values of both members

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Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

Which keyword is used to define an anonymous structure or union within another structure or union?

A) anonymous B) hidden C) struct D) none of the above

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Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

In a union, which member can you access safely after assigning a value to one of its members?

A) All members can be accessed B) Only the last assigned member C) Only the first assigned member D) Any member, but it's compiler-dependent

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Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

Which type of variable should you use if you want to store different types of data at different times within the same memory location?

A) int B) float C) char D) union

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Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

Which of the following is true about the memory allocation of structures and unions in C?

A) Structures require memory for all members simultaneously B) Unions require memory for all members simultaneously C) Structures allocate memory for the largest member D) Unions allocate memory for the smallest member

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Answer & Solution

Answer: Option C

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In C, can a structure be passed as an argument to a function?

A) Yes, by value B) Yes, by reference C) No, it's not allowed D) Only if the structure has fewer than 3 members

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Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

What is the purpose of using a typedef with structures and unions in C?

A) To create a new data type name for the structure or union B) To create a new structure with the same members C) To hide the details of the structure or union D) To add typecasting support to the structure or union

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Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

When should you use a structure instead of an array in C?

A) When you need to store elements of different data types B) When you need a fixed-size collection of elements C) When you need a dynamic collection of elements D) When you need to perform mathematical operations

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Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

What is the purpose of an anonymous union in C?

A) To group related members within a structure B) To declare a union without a name C) To hide the union's members from external access D) To specify a union's memory alignment

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Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

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