How do you obtain the value referenced by a pointer?

A pointer is a programming language object that stores the memory address of another value located in the computer’s memory. To obtain the value referenced by a pointer, you need to dereference it. Dereferencing a pointer means accessing the value stored at the memory address pointed to by the pointer itself. This allows you to retrieve and manipulate the data it points to.

To obtain the value referenced by a pointer, you can use the dereference operator, also known as the indirection operator or the asterisk (*) symbol. By prefixing the pointer variable’s name with the asterisk symbol, you can access the value stored at the memory location pointed to by the pointer.

For example, if you have a pointer variable named ptr that points to an integer, you can obtain the value it references by using the following code:


int *ptr; // declaration of a pointer variable
int value;

int referencedValue = *ptr; // obtaining the value referenced by ptr


In the above code snippet, the asterisk (*) symbol precedes the pointer variable ptr when assigning a value or obtaining a value to/from the memory address it points to. Therefore, *ptr obtains the value referenced by the pointer.

What is a pointer?

A pointer is a variable type in programming languages that stores the memory address of another value.

Why do we use pointers?

Pointers allow efficient memory management, enable dynamic data structures, permit the passing of values by reference, and facilitate direct manipulation of memory addresses.

How do pointers help in memory management?

Pointers enable us to dynamically allocate and deallocate memory, improving efficiency and resource allocation in programs.

What is the difference between a pointer and a variable?

A variable stores a value, whereas a pointer stores the memory address of a value.

Can a pointer point to another pointer?

Yes, a pointer can point to another pointer. This is known as a pointer to a pointer or a double pointer.

What happens if a pointer is not initialized?

If a pointer is not initialized, it contains an unpredictable value often referred to as a “garbage value.” Dereferencing an uninitialized pointer can result in undefined behavior.

Can a pointer point to nothing?

Yes, a pointer can have a special value called “NULL” or “nullptr” indicating it does not point to a valid memory address.

What happens if you dereference a null pointer?

Dereferencing a null pointer leads to undefined behavior, potentially causing a crash or unexpected program behavior.

Can you perform arithmetic operations on pointers?

Yes, you can perform arithmetic operations on pointers such as addition, subtraction, and comparison. These operations are adjusted based on the size of the underlying data type.

How do you assign a value to a pointer?

You can assign a value to a pointer by using the address-of operator (&) followed by the variable you want to obtain the address of. For example, ptr = &value; assigns the address of the variable value to the pointer ptr.

Can you pass a pointer to a function?

Yes, pointers can be passed as parameters to functions, allowing you to modify variables in the calling function or access memory efficiently.

What is the size of a pointer?

The size of a pointer depends on the underlying computer architecture and the programming language being used. Generally, a pointer’s size is equal to the size of the memory address being stored.

Can you create an array of pointers?

Yes, you can create an array of pointers. Each element in the array will be a pointer pointing to a specific memory location.

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