// Author:  Fadi Almasri
//Explanation: Variable and Pointer Declaration:

//int num = 10;: This declares an integer variable num and initializes it with the value 10.
//int *ptr;: This declares a pointer ptr that can hold the address of an integer variable.
//Assigning an Address to a Pointer:

//ptr = #: The address of the variable num is assigned to the pointer ptr. The & operator is used to get the address of a variable.
//Accessing Value Using a Pointer:

//*ptr: The * operator is used to access the value stored at the address that the pointer ptr is pointing to. This is known as dereferencing the pointer.
//Modifying Value Using a Pointer:

//*ptr = 20;: This changes the value at the address stored in ptr to 20. Since ptr holds the address of num, this also changes the value of num.

//The program outputs the original value of num, the value accessed via the pointer, the address of num, the address stored in the pointer, and finally, the modified value of num after using the pointer.

#include <iostream>
using namespace std;

int main() {
    // Declare an integer variable
    int num = 10;

    // Declare a pointer variable that can store the address of an integer
    int *ptr;

    // Assign the address of the variable 'num' to the pointer 'ptr'
    ptr = &num;

    // Output the value of the variable 'num' using the pointer
    cout << "Value of num: " << num << endl;
    cout << "Value of num using pointer: " << *ptr << endl;

    // Output the address of the variable 'num'
    cout << "Address of num: " << &num << endl;

    // Output the address stored in the pointer 'ptr'
    cout << "Address stored in pointer ptr: " << ptr << endl;

    // Modify the value of 'num' using the pointer
    *ptr = 20;

    // Output the new value of 'num'
    cout << "New value of num after modification: " << num << endl;

    return 0;
}