#include "stdafx.h"
#include <stdio.h>
 
void main()
{
 
	int num1;
	int num2;
 	
	printf("Please enter number 1: ");
	scanf("%d",&num1);
 
	printf("Please enter number 2: ");
	scanf("%d",&num2);
 
	printf("\n\nNumber 1: %d\nNumber 2: %d\n",num1,num2);
 
	printf("\n\nThis is the switch:\nNumber 1 is now %d\nNumber 2 is now: %d",num1,num2);

}

int main()
{
    int n1,n2;
    
    scanf("%d %d", &n1, &n2);
    n1 ^= n2 ^= n1 ^= n2;
    
    printf("%d %d", n1,n2);
}

x = x+b;    ( x= 9)
b = x -b;   ( b =5)
x = x -b;   ( x= 4)