What is the output of this code? Why? What does '&' mean when used to declare an 'int' value?

Question

void f(int& x) {
cout << x++;
x = 2;
}
int main(){
int a = 3;
int& b= a;
f(a);
cout << b;
}

Answer 1

#include <iostream>
using namespace std;

void f(int& x) { // 3. Every change on x variable will affect a

// 4. print the current value of x (an allias for a), then increment by 1
cout << x++; // 3

// 5. put 2 in x (and a also)
x = 2;
}

int main() {
int a = 3;

// 1. define and initialize an integer reference using a variable
int &b= a;

// 2. calling f function with a variable
f(a);

// 6. print the value of b which is an alias for a
cout << b; // 2
}

Output : 32

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