References vs. pointers

#include <iostream>
using namespace std;

int main() {
    int i = 3;
    std::cout << "i: " << i << "\n";
    
    int* pi = &i;
    std::cout << "pi: " << pi << "\n";
    std::cout << "*pi: " << *pi << "\n";
    
    int& ri = i;
    std::cout << "ri: " << ri << "\n";
    
    *pi = 4;
    
    std::cout << "i: " << i << "\n";
    
    return 0;
}