#include <iostream>

using namespace std;

void swap(int &arg1, int &arg2) {
   int temp = arg1;
   arg1 = arg2;
   arg2 = temp;
}


int main() {

   int foo = 42;
   int foo2 = 11;

   cout << "foo - " << foo << " foo2 - " << foo2 << endl;
 
   swap (foo, foo2);
 
   cout << "foo - " << foo << " foo2 - " << foo2 << endl;

   cout << "hello world!! in c++" << endl;

   return 0;
}