While giving interviews, Interviewers generally asks questions which tests logical thinking of candidate. This is one of the questions I faced while giving Interviews.

There are 2 ways through which you can swipe 2 numbers and it will gives you desired result.

**Method 1:**

Suppose **X = 20 and Y = 10**

Pseudo code for this is:

X = X + Y // Hence, X will be 30Y = X - Y // Hence, Y will be 20X = X - Y // Hence, X will be 10

So this will swipe numbers.

**Method 2:**

Suppose **X = 20 and Y = 10**

**
**Pseudo code for this is:

**X = X + Y - (Y=X);**

To elaborate this further, First **X+Y** will happen that makes things like below:

**X = 30 - (Y = X)**

Then,

Y = X // Y will be 20

Hence,

` `**X = 30 - 20 = 10**