Quiz for Pointers and arrays

Q1: Which of the following correctly declares a pointer to an array of integers in C?

A. int *arr; B. int (*arr)[5]; C. int arr*; D. int &arr;

Q2: If arr is an array, what does arr represent in expressions?

A. Address of first element B. Value of first element C. Size of the array D. Pointer to last element

Q3: Which operator is used for pointer arithmetic with arrays?

A. + and - B. * C. & D. sizeof

Q4: What will *(arr + 2) access in an int array arr?

A. First element B. Second element C. Third element D. Last element

Q5: What is the relationship between array indexing and pointers?

A. arr[i] is same as *(arr + i) B. They are different C. Indexing is faster D. Pointers are slower

Q6: If int arr[5]; int *p = arr; then p[3] is equivalent to?

A. *(p + 3) B. *(p + 2) C. *(arr + 2) D. p + 3

Q7: What will happen if you increment a pointer to an int?

A. It moves by 1 byte B. It moves by 4 bytes C. It moves by size of int D. It causes an error

Q8: Which function parameter declaration allows modification of the original array?

A. void func(int arr[]) B. void func(int *arr) C. Both A and B D. None of these

Q9: How do you dynamically allocate an array of 10 ints?

A. int arr[10]; B. malloc(10 * sizeof(int)); C. calloc(10, sizeof(int)); D. Both B and C

Q10: What is the output type of the expression &arr[0]?

A. int B. int * C. int ** D. void *

Q11: Which of these is NOT valid for accessing array elements via pointers?

A. *(arr + i) B. i[arr] C. arr[i] D. arr + i

Q12: When passing a 2D array to a function, which declaration is correct?

A. void func(int arr[][]) B. void func(int arr[3][3]) C. void func(int (*arr)[3]) D. Both B and C

Q13: Which statement about arrays and pointers is false?

A. Arrays are pointers B. Pointers can point to arrays C. Array names decay to pointers D. Pointer arithmetic is valid on arrays

Q14: If int arr[5] = {1,2,3,4,5}; then *(arr + 4) = ?

A. 1 B. 4 C. 5 D. Error

Q15: Can a pointer to an array be incremented?

A. Yes B. No C. Only with arrays of integers D. Only if it is void pointer

Q16: Which of these points to the second element of arr?

A. arr + 1 B. &arr + 1 C. *arr + 1 D. &arr[1]

Q17: What happens when you assign an array name to a pointer?

A. Pointer stores base address B. Pointer copies all elements C. Pointer becomes array D. Compiler error

Q18: Which syntax is correct for pointer to an array of 10 integers?

A. int *p[10]; B. int (*p)[10]; C. int p*[10]; D. int p(10)*;

Q19: If p is a pointer to an array, how to access the third element?

A. *p + 2 B. (*p)[2] C. *(p[2]) D. p[2]

Q20: Which operation is illegal on array names?

A. Increment B. Assignment C. Subscript D. Dereference