Pointer

  • A pointer is an object that contains a memory address.
  • Typically, a pointer is used to access the value of another object.
  • Often this other object is an array. In fact, pointers and arrays are related to each other more than you might expect.
  • The pointer is one of C++’s most powerful features. It is also one of its most troublesome.
  • Despite their potential for misuse, pointers are a crucial part of C++ programming.

Pointer

Pointer variable declaration

  • A pointer is an object that contains a memory address.
  • Very often this address is the location of another object, such as a variable. For example, if x contains the address of y, then x is said to “point to” y.

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Syntax

type *var-name; //Here, type is the pointer’s base type.
int *ip;

The Pointer Operators

  • There are two special operators that are used with pointers: * and &. The & is a unary operator that returns the memory address of its operand.​​​​​​​
ptr = &total;
  • The second operator is *, and it is the complement of &. It is a unary operator that returns the value of the variable located at the address specified by its operand.​​​​​​​
 val = *ptr;

Example

#include using namespace std; 
int main() 
 {
   int total;
   int *ptr;
   int val;
   total = 3200; // assign 3,200 to total
   ptr = &total; // get address of total
   val = *ptr; // get value at that address
   cout << "Total is: " << val << '
';
   return 0;
 }