Free Test Pointers basics and po... – C++ Lan...

Q1: What does a pointer in C++ store?

A. The memory address of a variable B. The value of a variable C. The size of a variable D. The data type of a variable

Q2: What is the output of the expression *ptr if ptr is a pointer?

A. The value at the address ptr points to B. The address stored in ptr C. The size of the pointer D. The data type of the pointer

Q3: Which operator is used to get the address of a variable?

A. * B. & C. -> D. %

Q4: What does pointer arithmetic mean?

A. Performing arithmetic on the memory address stored in a pointer B. Adding two pointers C. Multiplying pointer values D. Dividing pointer addresses

Q5: If ptr is an int* pointing to an array, what does ptr + 1 point to?

A. The next integer element in the array B. The next byte C. The first element D. A random memory location

Q6: What is a null pointer?

A. A pointer that points to no valid memory B. A pointer to zero value C. A pointer to the first element D. A pointer to itself

Q7: How do you declare a pointer to an integer?

A. int *ptr; B. int ptr*; C. *int ptr; D. ptr int*;

Q8: What happens when you increment a pointer?

A. It points to the next element of its type B. It points to the next byte C. It becomes invalid D. It points to the first element

Q9: Which operator is used to access members of a structure via pointer?

A. -> B. . C. * D. &

Q10: What does the expression ptr-- do?

A. Moves pointer to the previous element B. Moves pointer to the next element C. Deallocates memory D. Initializes pointer

Q11: Can pointers be compared?

A. Yes, pointers can be compared using relational operators B. No, pointers cannot be compared C. Only equality check is allowed D. Only null checks allowed

Q12: What is pointer decay?

A. Conversion of array name to pointer to its first element B. Pointer losing its value C. Pointer becoming null D. Pointer type changing

Q13: What is the size of a pointer on a 64-bit system?

A. 8 bytes B. 4 bytes C. Depends on data type D. 16 bytes

Q14: What does void* represent?

A. A generic pointer to any type B. A pointer to void data C. A null pointer D. A pointer to int

Q15: Is pointer arithmetic allowed on void* pointers?

A. No, because size of void is unknown B. Yes, always C. Only addition allowed D. Only subtraction allowed

Q16: How do you dynamically allocate memory for an int in C++?

A. int *ptr = new int; B. int *ptr = malloc(sizeof(int)); C. int ptr = new int; D. int ptr = malloc(sizeof(int));

Q17: How do you free dynamically allocated memory in C++?

A. delete ptr; B. free(ptr); C. delete[] ptr; D. ptr = nullptr;

Q18: What is the difference between delete and delete[]?

A. delete frees single object, delete[] frees array B. Both are same C. delete frees arrays, delete[] frees single objects D. delete is deprecated

Q19: What is a dangling pointer?

A. A pointer that points to freed memory B. A null pointer C. A pointer pointing to static data D. A pointer with invalid type

Q20: What is a wild pointer?

A. A pointer not initialized to any valid address B. A pointer pointing to null C. A pointer pointing to global variable D. A pointer in stack memory

Quiz for Pointers basics and pointer arithmetic