Pointers Using C++ Program 1

//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: