Pointers in c++

              A variable which holds the address of a memory location is called a pointer. It deals with memory.

To create a pointer variable, follow the syntax.

‘datatype *variable_name;’

Eg:

‘int *ptr;’

 C++ Program:

This program includes the built-in header file <iostream>. Next main() is defined.

It has following steps:

• A variable a is declared as integer. It reads the user input from command prompt.
• A pointer variable *ptr is declared.

#include <iostream>

using namespace std;

int main()

{

    int a;//Declaration of integer variable

    int *ptr; // Declarartion of pointer variable

    // getting the input from user

    cout<<"Enter the variable:"<<endl;

    cin>>a;

    // storing address of a in pointer myptr

    ptr = &a;

    cout << "Value of a is: ";

    cout << a << endl;

    // print the address stored in ptr pointer variable

    cout << "The Address stored in ptr is: ";

    cout << ptr << endl;

     // printing value of a

    cout << "Value of a using *ptr is: ";

    cout << *ptr << endl;

    return 0;

}

Output:

Enter the variable:

56

Value of a is: 56

The Address stored in ptr is: 0x7ffcb2dc4404

Value of a using *ptr is: 56

Consider the special feature called ‘this’ pointer .

‘this’ pointer:

              It is used to refers a current object reference.

Eg:

This->a=a;

Hope, you understood the concept of pointers. You can try these concepts in float, double variables. Keep Coding!!!