GeeksforGeeks

Last Updated: 23 July 2025

In C++, pointer is a variable that stores the memory address as its value. It is a powerful feature that forms the backbone of lower-level memory manipulation in C++. It i...read more

C++

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NULL Pointer in C++

Last Updated: 23 July 2025

A NULL Pointer in C++ indicates the absence of a valid memory address in C++. It tells that the pointer is not pointing to any valid memory location In other words, it has...read more

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Difference between Dangling pointer and Void pointer

Last Updated: 23 July 2025

Dangling pointer: A pointer pointing to a memory location that has been deleted (or freed) is called a dangling pointer. There are three different ways where Pointer acts ...read more

Difference between constant pointer, pointers to constant, and constant pointers to constants

Last Updated: 23 July 2025

In this article, we will discuss the differences between constant pointer, pointers to constant constant pointers to constants. Pointers are the variables that hold the a...read more

How many levels of pointers can we have in C/C++

Last Updated: 15 July 2025

Prerequisite: Pointer in C and C++, Double Pointer (Pointer to Pointer) in CA pointer is used to point to a memory location of a variable. A pointer stores the address of ...read more

Why do we need reference variables if we have pointers

Last Updated: 15 July 2025

Pointers: A pointer is a variable that holds memory address of another variable. A pointer needs to be de referenced with * operator to access the memory location it point...read more

What is a Pointer to a Null pointer

Last Updated: 12 July 2025

NULL pointer in C At the very high level, we can think of NULL as a null pointer which is used in C for various purposes. Some of the most common use cases for NULL areTo ...read more

Features and Use of Pointers in C/C++

Last Updated: 28 July 2025

Pointers store the address of variables or a memory location.Syntax:datatype *var_name; Example: pointer "ptr" holds the address of an integer variable or holds the addres...read more

Sum of array using pointer arithmetic

Last Updated: 21 September 2022

Given an array, write a program to find the sum of array using pointers arithmetic. In this program we make use of * operator . The * (asterisk) operator denotes the value...read more

C++

pointer

cpp-pointer

Passing By Pointer vs Passing By Reference in C++

Last Updated: 11 January 2025

In C++, we can pass parameters to a function either by pointers or by reference. In both cases, we get the same result. So, what is the difference between Passing by Point...read more

C++

pointer

cpp-parameter-passing

cpp-references

Complicated declarations in C

Last Updated: 22 August 2022

Most of the times declarations are simple to read, but it is hard to read some declarations which involve pointer to functions. For example, consider the following declara...read more

C Language

pointer

C-Variable Declaration and Scope

Const Qualifier in C

Last Updated: 23 July 2025

The qualifier const can be applied to the declaration of any variable to specify that its value will not be changed (which depends upon where const variables are stored, w...read more

C Language

pointer

C-Storage Classes and Type Qualifiers

Are Array Members Deeply Copied?

Last Updated: 23 July 2025

In C++, we can assign a struct (or class) variable to another variable of same type. All members of one variable are copied to the other variable. But what happens when th...read more

C Language

pointer

C Array and String

When do we pass arguments by pointer?

Last Updated: 08 January 2024

In C, the pass-by pointer method allows users to pass the address of an argument to the function instead of the actual value. This allows programmers to change the actual ...read more

C++

pointer

C-Pointers

Multidimensional Pointer Arithmetic in C/C++

Last Updated: 23 July 2025

In C/C++, arrays and pointers have similar semantics, except on type information.As an example, given a 3D arrayint buffer[5][7][6];An element at location [2][1][2] can be...read more

C++

pointer