C++

Identifiers and Types Constants Variables Assignment And Arithmetic Operators Bitwise Operators Logical Operators const static register volatile extern Statements if if - legal expressions ?: switch switch, no break Nested switch while do-while for Link for missing sections for, function in section bodyless for break continue goto exit Arrays Intro Bi-Dimensional Arrays Arrays and Loops Array Initialization Arrays As Functions Arguments Passing Multidimensional Arrays arrays, bound checking Pointers Pointer Increment Decrement Arrays of Pointers Pointer-Array Relationship Pointer Assignment Structures Arrays of Structures Structures containing Arrays Single Structure Declaration Functions in Structures Bit fields Unions Functions Within Unions Enumerations Functions Function Parameters How to Pass Parameters Arrays as Arguments Function Prototype Inline Functions Class-Object Definition Constructor Constructors and Destructors Passing Objects and Returning them Class Static Variables Class Static Functions Inheritance Intro protected Members Inherited Constructors and Destructors Multiple Inheritance Multiple Inheritance-Constructors Destructors Multiple Base-Disambiguation Disambiguation-Virtual Base Classes Constructor Parameters-Derived to Base Turning public Into protected in a Derived Class Function Overloading Intro Overloaded Constructors Copy Constructors Default Arguments Function Address Virtual Functions Intro Virtual Functions-Multiple Inheritance Abstract Class

Pointers

A pointer is a variable containing the memory address of another variable. The following statement declares a pointer p containing the address of an int variable:

int *p;

Given an integer variable:

int i = 3;

the address of variable i can be assigned to variable p:

p = &i;

The & operator returns the address of the variable it precedes. The content of the variable pointed to by p can be retrieved by placing the * operator in front of the pointer:

*p;

Example


#include <iostream>
using namespace std;

int main()
{   
     int *p;
     int i = 3;
     p = &i;

     cout << "The variable pointed to by p contains the value: " << *p;

     return 0;
}

Output

 The variable pointed to by p contains the value: 3