C++ pointers and dereferencing

pointer.c

/** 
 * Compile and execute: 
 * g++ pointer.c -o pointer && ./pointer
 */

#include <iostream>
#include <typeinfo>

using namespace std;

int main()
{
        // define variable
        int value = 42;

        cout << "Pointer\n";
        
        // define pointer to variable
        int* pointer = &value;

        // same as above
        // int *pointer = &value;

        cout << "  Reference: " << pointer << " of type " <<  typeid(pointer).name() << "\n"; // 0x7ffcaeedcc24 of type Pi
        cout << "  Dereferenced value: " << *pointer << "\n"; // 42
        
        cout << "Double pointer\n";
        
        int** double_pointer;
        double_pointer = &pointer;
    
        cout << "  Reference: " << double_pointer << " of type " <<  typeid(double_pointer).name() << "\n"; // 0x7ffcaeedcc28 of type PPi
        cout << "  Dereferenced value: " << *double_pointer << " of type " <<  typeid(*double_pointer).name() << "\n"; // 0x7ffcaeedcc24 of type Pi
        cout << "  Dereferenced value: " << **double_pointer << " of type " <<  typeid(**double_pointer).name() << "\n"; // 42 of type i
        
        return 0;
}