Pointer C++ Quiz

What is a pointer in C++?

• A pointer in C++ is a variable that holds the memory address of another variable.

• A pointer in C++ is a variable that holds the value of another variable.

• A pointer in C++ is a keyword used to define a function.

• A pointer in C++ is a data type used to store multiple values.

How do you declare a pointer in C++?

• int ptr

• ptr int

• int *ptr

• int* ptr

What is the purpose of a null pointer?

• The purpose of a null pointer is to point to a random memory location.

• The purpose of a null pointer is to indicate that the pointer is not currently pointing to a valid object or memory location.

• The purpose of a null pointer is to indicate that the pointer is pointing to a valid object or memory location.

• The purpose of a null pointer is to store a specific value in memory.

How do you assign a value to a pointer in C++?

• int *ptr = #

• int *ptr = *num;

• int *ptr = &*num;

• int *ptr = num;

What is the difference between a pointer and a reference in C++?

• A pointer and a reference are the same thing in C++.

• A pointer can be reassigned to point to different variables, while a reference cannot be reassigned.

• A pointer is a variable that holds the memory address of another variable, while a reference is an alias for an existing variable.

• A pointer can only be used with primitive data types, while a reference can be used with any data type.

What is the use of the 'new' operator in C++?

• The 'new' operator is used to deallocate memory for objects in C++.

• The 'new' operator is used to create a new instance of a class in C++.

• The 'new' operator is used to access the member variables of a class in C++.

• The 'new' operator is used to dynamically allocate memory for objects in C++.

What is the use of the 'delete' operator in C++?

• The 'delete' operator is used to allocate memory.

• The 'delete' operator is used to initialize variables.

• The 'delete' operator is used to perform arithmetic operations.

• The 'delete' operator is used to deallocate memory.

What is a dangling pointer in C++?

• A dangling pointer in C++ is a pointer that points to a memory location that has been deallocated or freed.

• A dangling pointer in C++ is a pointer that points to a memory location that has not been allocated.

• A dangling pointer in C++ is a pointer that points to a memory location that has been initialized with garbage values.

• A dangling pointer in C++ is a pointer that points to a memory location that has been resized.

What is the difference between a void pointer and a null pointer in C++?

• A void pointer is used for dynamic memory allocation, while a null pointer is used for static memory allocation.

• A void pointer and a null pointer are the same thing.

• A void pointer can only hold the address of a function, while a null pointer can hold the address of any data type.

• A void pointer can hold the address of any data type, while a null pointer does not point to any memory location.

What is the concept of pointer arithmetic in C++?

• Performing arithmetic operations on pointers

• Using pointers to perform logical operations

• Performing mathematical calculations using pointers

• Using arithmetic operators to manipulate memory addresses