Swap two variable values using C++ programming language without using third variable or temporary variable

/*Without using any third varible*/

#include<iostream.h>

 Using namespace std

    void main()

      {

             int a,b ;

             a=1 ;

             b=2 ;

    
          SwapInC++(a , b) ;  //swap function call

     
          Cout<<"values after swap a= "<< a <<endl ;

    
          Cout<<"values after swap b= "<< b <<endl ;

       }  //End of main

    void SwapInC++(int x,int y)  //definition of Swap functon

    {

          y= x-y+(x=y);

     }

Common Programming Error:-
C++ compiler read from left to right to do not Confound with swap logic.

Good Programming Practice:-
always use equation like here i used instead using another temporary storage.