Swapping_using_pointer.cpp

#include <iostream>  
using namespace std;  
int main()  
{  
int a=20,b=10,∗p1=&a,∗p2=&b;    
cout<<"Before swap: ∗p1="<<∗p1<<" ∗p2="<<∗p2<<endl;    
∗p1=∗p1+∗p2;    
∗p2=∗p1-∗p2;    
∗p1=∗p1-∗p2;    
cout<<"After swap: ∗p1="<<∗p1<<" ∗p2="<<∗p2<<endl;    
   return 0;  
}