Quiz for Array of structures

Q1: How do you declare an array of 10 structures named "students" of type "struct Student"?

A. struct Student students[10]; B. struct Student *students; C. struct Student students(); D. struct Student students{};

Q2: How do you access the "age" member of the 5th element in a structure array "students"?

A. students[5].age B. students.age[5] C. students->age[5] D. *(students.age[5])

Q3: What is the index of the first element in a structure array in C?

A. 1 B. 0 C. -1 D. Depends on compiler

Q4: Which of the following correctly assigns the "marks" member of the 3rd element in "arr"?

A. arr[2].marks = 75; B. arr.marks[2] = 75; C. (&arr[2])->marks = 75; D. Both A and C

Q5: How to initialize the first element of a structure array "arr" with name="John" and age=20?

A. struct Student arr[1] = { {"John", 20} }; B. struct Student arr[10] = { {"John", 20}, ... }; C. arr[0] = { "John", 20 }; D. Both A and B

Q6: How do you pass an array of structures to a function expecting "struct Student *"?

A. Pass the array name B. Pass the address of the first element C. Pass the whole array by value D. Both A and B

Q7: Which operator is used to access members of structures in an array?

A. . (dot) B. -> (arrow) C. * (asterisk) D. & (address-of)

Q8: Is this declaration valid? "struct Point pts[5];"?

A. Yes B. No C. Only with typedef D. Only in C++

Q9: How to assign the entire structure to an element of the array?

A. arr[0] = (struct Student){"Alice", 21} B. arr[0] = {"Alice", 21} C. Cannot assign whole structure at once D. arr[0].name = "Alice" arr[0].age = 21

Q10: Can arrays of structures be initialized partially?

A. Yes B. No C. Only with memset D. Only globally

Q11: What is the memory layout of an array of structures?

A. Contiguous blocks of structures B. Random scattered blocks C. Each structure is allocated separately D. Depends on compiler

Q12: Can a structure array contain elements of different sizes?

A. Yes B. No C. Only with unions D. Only with pointers

Q13: Which header is required to use memset to initialize a structure array?

A. stdio.h B. string.h C. stdlib.h D. memory.h

Q14: What happens if you access out-of-bounds index of a structure array?

A. Compiler error B. Runtime error C. Undefined behavior D. Returns NULL

Q15: How to get the address of the 4th element in a structure array "arr"?

A. &arr[3] B. &arr[4] C. arr + 3 D. Both A and C

Q16: What is the type of "arr" if declared as "struct Student arr[10];"?

A. Pointer to struct Student B. Array of struct Student C. Pointer to pointer D. Void pointer

Q17: Which function prototype correctly takes a structure array and its size?

A. void func(struct Student arr[], int n) B. void func(struct Student *arr, int n) C. void func(struct Student arr[10]) D. All of the above

Q18: Can an array of structures be returned from a function?

A. No B. Yes, by returning a pointer C. Yes, by returning the whole array D. Only in C++

Q19: How to iterate over an array of structures using a pointer?

A. Use pointer arithmetic on the pointer B. Use array indexing only C. Use pointer to pointer D. Not possible