C++ Tutorial- Program- 17- Pointers

Code:

//Pointers: A pointer is a variable that contains the address of a variable.

#include<iostream>

using namespace std;

main()

{

 int x=100;   // initialize integer type variable name x

 int *y;     // declare integer type pointer y

    cout<<x;  // print value of integer type variable x

    cout<<"\n";   // new line

  y=&x;        // giving address of variable x to y

 *y=5000;    // without accessing x changing value of x=100 to 5000

 cout<<x;     // after, poiting now, value of x is : 5000

 cout<<"\n";  // new line

 int **z;     // declare integer type pointer to pointer c

 z=&y;        // giving address of y to z

 **z=90;     // now, without disturbing x&y value of x is 90

 cout<<x;    //value of x is 90 

}

Output: