swap using reference c++ code example

Example 1: swap in cpp

int a{}, b{}, temp{};
cin >> a >> b;

  //===================== METHOD-1
   temp = a;
   a = b;
   b = temp;

  //===================== METHOD-2 ( XOR ^ )
  // example: a^b =  5^7
   a = a ^ b;   // 5^7
   b = a ^ b;   // 5 ^ 7 ^ 7  //5 ( 7 & 7 dismissed)
   a = a ^ b;   // 5 ^ 7 ^ 5  //7 ( 5 & 5 dismissed)

  //===================== METHOD-3  ( swap() )
  swap(a, b);

  cout << "a " << a << endl;
  cout << "b " << b << endl;

Example 2: call by reference c++ example

//call by reference example c++
#include <iostream>

using namespace std;

void swap(int& x, int& y) {
	cout << x << " " << y << endl;
	int temp = x;
	x = y;
	y = temp;
	cout << x << " " << y << endl;

}

int main() {
    
	int a = 7;
	int b = 9;

	swap(a, b);

}