#include <iostream>
using namespace std;

int main(int argc, char const *argv[]) {

        int a = 10;
        int b = 20;
        int c = 30;
        //Pointer to variable
        //int *newPtr;
        //*newPtr = c;
        //std::cout << "*newptr " << *newPtr << '\n';
        int *ptr = &a;
        int **ptrDouble = &ptr;
        std::cout <<"ptr = "<< ptr << '\n';
        std::cout << "&a = " << &a << '\n';
        std::cout <<"ptrDouble =  "<< ptrDouble << '\n';
        std::cout <<"&ptr = "<< &ptr << '\n';
        std::cout <<"*ptrDouble = "<< *ptrDouble << '\n';
        std::cout <<"**ptrDouble = "<< **ptrDouble << '\n';
        std::cout << "*ptr = " << *ptr << '\n';

        *ptr = c;
        std::cout << "ptr = "<< ptr << '\n';
        std::cout << "*ptr = " << *ptr << '\n';
        std::cout << "a = "<< a << '\n';

        return 0;
}