Swap two variable value using C programming without using third variable or temporary variable

/* Without using any third varible*/

#include<stdio.h>

  void SwapInCv(int x , int y) ;  //function reference

  void main()

     {

             int a,b ;
             a=1 ;

             b=2 ;

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

  
             printf("values after swaping a=%d & b=%d ", a , b) ;

     }  //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 or switch logic.

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