Pointers and references in C++: what happens when c takes the value that b points to

pointers_and_references_b_gets_value_of_pointer.cpp

#include <iostream>
using namespace std;

void change_val(int &z);

int main() {
    int a = 1;
    int *b = &a;
    int c = *b;
    cout << "c is an integer that takes the value that b points to\n";
    cout << "a=" << a << ", b=" << b << ", *b=" << *b << ", c=" << c << endl;
    // prints: a=1, b=0x7fffd3bf5de8, *b=1, c=1
  
    change_val(c);
    cout << "changing c does not change anything else\n";
    cout << "a=" << a << ", b=" << b << ", *b=" << *b << ", c=" << c << endl;
    // prints: a=1, b=0x7fffd3bf5de8, *b=1, c=2
}

void change_val(int &z) {
    z++;
}