Swap three variables without using fourth variable !!

1. public class SwapThreeNumberWithoutFourthVariable {
2. public static void main(String[] args) {
3. int a = 10;
4. int b = 20;
5. int c = 30;
6. 
   
7. a = a + b + c;
8. b = a - (b + c);
9. c = a - (b + c);
10. a = a - (b + c);
11. System.out.println("after swap value of a: " + a);
12. System.out.println("after swap value of b: " + b);
13. System.out.println("after swap value of c: " + c);
14. }
15. }

Output:

after swap value of a: 30

after swap value of b: 10

after swap value of c: 20