C++ Pointers and Memory Management Quiz

Which of the following correctly declares a pointer to an integer in C++?

• int pointer;

• int *pointer;

• pointer int*;

• int &pointer;

Answer explanation

To declare a pointer to an integer, we use after the data type: int pointer;. This means pointer can store the memory address of an integer.

What is the output of the following code?

• num

• 10

• ptr

• &num

Answer explanation

To declare a pointer to an integer, we use after the data type: int pointer;. This means pointer can store the memory address of an integer.

Which operator is used to get the address of a variable in C++?

• *

• &

• @

• #

Answer explanation

The ampersand (&) is used to get the memory address of a variable. For example, &x gives the address of variable x.

What is the relationship between a pointer and an array in C++?

• Pointers cannot access array elements.

• A pointer can point to only the last element of the array.

• Array name is a constant pointer to the first element.

• Arrays do not work with pointers.

Answer explanation

In C++, the name of the array acts like a pointer to the first element. That’s why you can use pointer arithmetic to access array elements.

What is the purpose of the new and delete operators in C++?

• To perform multiplication and division.

• To create and remove functions.

• To allocate and free memory during runtime.

• To declare variables.

Answer explanation

The new operator is used to allocate memory dynamically (during program running time), and delete is used to free that memory when it is no longer needed.