Pointers from data structures and algorithms

What does a pointer in C/C++ store?

• Data value

• Memory address

• Variable name

• Function name

Which operator is used to access the value stored at the address a pointer points to?

• &

• *

• →

• %

What will happen if you dereference a NULL pointer?

• Program runs normally

• Access violation error (segmentation fault)

• Returns 0

• Memory is allocated automatically

In dynamic memory allocation, which function is used in C to allocate memory?

• alloc()

• malloc()

• new

• calloc()

What is a dangling pointer?

• Pointer initialized to zero

• Pointer that points to freed memory

• Pointer pointing to a global variable

• Pointer used for dynamic allocation

How do you obtain the memory address of a variable in C?

• Using * operator

• Using & operator

• Using → operator

• Using % operator

What is the output of the following snippet? int a = 10; int *p = &a; printf("%d", *p);

• Address of a

• Garbage value

• 10

• Compile-time error

Which of the following is true about pointer arithmetic?

• Incrementing a pointer increases address by 1 byte

• Incrementing a pointer increases address by size of the data type it points to

• Pointer can only be decremented

• Pointer arithmetic is not allowed in C

What does the following declaration mean? int *ptr;

• ptr is an integer variable

• ptr is a pointer to an integer

• ptr is an array of integers

• ptr is a pointer to an array

Which of the following can you NOT do with pointers?

• Store the memory address of a variable

• Perform arithmetic operations on pointers

• Assign a pointer to another pointer of the same type

• Multiply two pointers