Swap two values without using third variable

/*    Swap the values of two variables without using third variable   */

#include<stdio.h>

int main()
{
 int a;
 int b;
 printf("Type value of A : ");
 scanf("%i",&a);
 printf("\nType value of b : ");
 scanf("%i",&b);
  a = a + b;
  b = a - b;
  a = a - b ;
 printf("A : %i",a);
 printf("\nB : %i",b);
 return 0;
}