Swap Two Numbers Without Using a Third Variable | Top Interview Question Explained
Learn how to swap two numbers without using a third variable — one of the most popular coding interview questions asked in TCS, Infosys, Wipro, Accenture, Cognizant, and MNC interviews.
In this video, I’ll explain the logic clearly using a whiteboard, and then switch to VS Code to write and run the program.
You’ll learn 2 methods:
✔ Using Arithmetic (Addition/Subtraction)
✔ Using XOR (Bitwise Operator)
By the end of the video, you will understand:
How swapping works behind the scenes
When each approach is safe to use
Common mistakes candidates make
How to write clean, interview-ready code
Perfect for beginners, MERN stack learners, and anyone preparing for coding interviews.
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