Logical error with exchanging values. How do I fix this?

[Siz8AqkS]

I am trying to exchange values of two variables throughout the code and I can't seem to fix it. Here is a samples code. What am I doing wrong? Thanks a bunch!

#include <iostream>
#include <stdlib.h>

using namespace std;

int main ()
{
    int xx, yy, newxx, newyy;
    xx=11;
    yy=22;
    
    xx=newxx;
    yy=newyy;
    xx=newyy;
    yy=newxx;
    
    cout<<xx<<endl;
    cout<<yy<<endl;
    system ("PAUSE");
    return 0;
}

This code outputs to:

2
39

[keskiverto]

1 2 3 4 5 6

int xx; int newxx; xx=11; xx = newxx;

value of xx is not defined value of newxx is not defined xx is now 11 xx is now same as newxx, i.e. not defined

See http://www.cplusplus.com/reference/utility/swap/