Can you solve this problem?

Question

Hy guys there is a 2 int variable. can u swap those int variables with out using any if conditions as well as without any casting.and u cannot use any more variables.

    ie :
    int a=10;
    int b= 5;
    always a>b;

the answer should be a=5;b=10;

Answer 1

yes you can do it By using plus/minus operation.

Example:
num1 = num1 + num2;                
num2 = num1 - num2;                
num1 = num1 - num2;

Answer 2

a=a+b;
b=a-b;
a=a-b;

Answer 3

It's a little trick.

int a = 5;
int b= 10;
a = a+b;
b = a-b; /* Really (a+b) - b i.e. a */
a = a-b; /* Really (a+b) - a i.e. b */

Answer 4

a=a+b
b=a-b
a=a-b

That's it!

Answer 5

If you think you are being clever by not using 3rd variable then do some performance tests and you see that the much faster way is to use 3rd int to store the variable temporarily.

Anyways, i solved the problem with XOR bitwise operator:

a ^= b;
b ^= a;
a ^= b;

Answer 6

simple try this

a=a+b;
b=a-b;
a=a-b;

and that's it