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

11.
What is the size of the following structure in C++: struct Employee { int id; char name[20]; float salary; };

A. 28 bytes

B. 20 bytes

C. 8 bytes

D. 32 bytes

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12.
What is the correct syntax to define a structure pointer in C++?

A. structName *ptr;

B. ptr *structName;

C. struct *ptrName;

D. *ptrName structName;

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13.
What is the output of the following code: union Data { int x; char y; }; Data d; d.x = 10; d.y = 'A'; cout << d.x << " " << d.y; in C++?

A. Compilation error

B. A A

C. 10 10

D. 0.416666667

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14.
What is the purpose of using unions in C++?

A. To group related data together

B. To define loops in the program

C. To save memory space

D. To represent true/false values

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15.
What does the 'sizeof' operator return when used with a structure in C++?

A. Size of the last member of the structure

B. Size of the first member of the structure

C. Size of the structure

D. Address of the structure

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16.
What is the correct syntax to declare a structure with a tag name in C++?

A. structName { /* members */ };

B. struct { /* members */ } structName;

C. structName typedef { /* members */ };

D. struct structName { /* members */ };

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17.
What is the correct way to access structure members through a pointer 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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18.
What is the difference between a structure and a class in C++?

A. Structures support inheritance

B. Classes support only member functions

C. By default, members of a class are private, while members of a structure are public

D. Structures cannot contain member functions

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19.
What is the output of the following code: struct Point { int x, y; }; Point p1; p1.x = 10; p1.y = 20; cout << p1.x << " " << p1.y; in C++?

A. Garbage value 20 10

B. 10 20

C. Compilation error

D. None of the above

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20.
What is the purpose of the 'typedef' keyword in C++ structures?

A. To create a pointer to a structure

B. To initialize structure members

C. To create an alias for a data type

D. To define a new structure

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

11. What is the size of the following structure in C++: struct Employee { int id; char name[20]; float salary; };

Answer & Solution

12. What is the correct syntax to define a structure pointer in C++?

Answer & Solution

13. What is the output of the following code: union Data { int x; char y; }; Data d; d.x = 10; d.y = 'A'; cout << d.x << " " << d.y; in C++?

Answer & Solution

14. What is the purpose of using unions in C++?

Answer & Solution

15. What does the 'sizeof' operator return when used with a structure in C++?

Answer & Solution

16. What is the correct syntax to declare a structure with a tag name in C++?

Answer & Solution

17. What is the correct way to access structure members through a pointer in C++?

Answer & Solution

18. What is the difference between a structure and a class in C++?

Answer & Solution

19. What is the output of the following code: struct Point { int x, y; }; Point p1; p1.x = 10; p1.y = 20; cout << p1.x << " " << p1.y; in C++?

Answer & Solution

20. What is the purpose of the 'typedef' keyword in C++ structures?

Answer & Solution

11.
What is the size of the following structure in C++: struct Employee { int id; char name[20]; float salary; };

12.
What is the correct syntax to define a structure pointer in C++?

13.
What is the output of the following code: union Data { int x; char y; }; Data d; d.x = 10; d.y = 'A'; cout << d.x << " " << d.y; in C++?

14.
What is the purpose of using unions in C++?

15.
What does the 'sizeof' operator return when used with a structure in C++?

16.
What is the correct syntax to declare a structure with a tag name in C++?

17.
What is the correct way to access structure members through a pointer in C++?

18.
What is the difference between a structure and a class in C++?

19.
What is the output of the following code: struct Point { int x, y; }; Point p1; p1.x = 10; p1.y = 20; cout << p1.x << " " << p1.y; in C++?

20.
What is the purpose of the 'typedef' keyword in C++ structures?