C++ Pointers Quiz

What is the result of adding 1 to a pointer in C++?

• The pointer will point to the next memory location of the same data type.

• The pointer will point to the previous memory location of the same data type.

• The pointer will point to a random memory location.

• The pointer will become NULL.

How can you find the difference between two pointers in C++?

• By dividing the memory addresses

• By adding the memory addresses

• By subtracting the memory addresses

• By multiplying the memory addresses

Explain the concept of pointer arithmetic with an example in C++.

• Pointer arithmetic involves multiplying a pointer by an integer value to access elements of an array.

• Pointer arithmetic in C++ is used to perform mathematical operations on the memory address of a pointer.

• In C++, pointer arithmetic can only be performed on pointers to primitive data types.

• Pointer arithmetic in C++ involves adding or subtracting an integer value to/from a pointer to access elements of an array. For example, if 'ptr' is a pointer to an integer, then 'ptr + 1' will point to the next integer in memory.

What happens when you subtract one pointer from another in C++?

• It gives the sum of the two pointers

• It gives the number of elements between the two pointers, divided by the size of the type to which the pointers point.

• It gives the difference of the two pointers

• It gives the product of the two pointers

What is a pointer to a pointer in C++?

• Data type for storing multiple values

• Operator for comparing two variables

• Variable that holds the address of another pointer

• Function that returns a value

How do you declare and use a pointer to a pointer in C++?

• int ptr**

• int **ptr

• int ptr*

• int *ptr

Explain the concept of null pointers in C++.

• Null pointers are pointers that can only be used with integer data types

• Null pointers are pointers that automatically allocate memory for the variable they point to

• Null pointers are pointers that point to the highest memory location

• Null pointers are pointers that do not point to any memory location.

What are the potential risks of using null pointers in C++?

• Compilation errors

• Infinite loops

• Segmentation faults, undefined behavior, and program crashes

• Memory leaks

How do you check if a pointer is a null pointer in C++?

• Dereferencing the pointer

• Comparing it to the value nullptr.

• Checking the memory address

• Using the keyword 'null'

Explain the role of null pointers in dynamic memory allocation in C++.

• Null pointers are used to store data in dynamic memory allocation

• Null pointers are used to indicate that the pointer does not point to any memory location.

• Null pointers are used to prevent memory leaks

• Null pointers are used to access memory locations directly