SWAP Two Values without using temporary variable

/**
    Program Name: Swap Two Numbers

    Description: This Program swaps two number, using XOR

    Author:  Tauqirul Haque
      
*/

#include <stdio.h>
#include <conio.h>

int main()
{
    int firstNumber, secondNumber;
  
    printf("Enter The First Number :  ");
    scanf("%d",&firstNumber);
  
    printf("\nEnter The Second Number :  ");
    scanf("%d",&secondNumber);
  
    printf("\n\nNumbers Before Swapping :  %d  <-> %d \n",firstNumber, secondNumber);
  
    firstNumber = firstNumber^secondNumber;
    secondNumber = firstNumber^secondNumber;
    firstNumber = firstNumber^secondNumber;
  
    printf("\nNumbers After Swapping :   %d  <->  %d \n",firstNumber, secondNumber);
  
}