Programming Example

C# Program to swap two numbers without third variable

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💻 Practical Program

📘 Step by Step Learning

Program 1: Using ? and /

Let us see a simple C# example to swap two numbers without using third variable.

Program Code

using System;  
  public class SwapExample  
   {  
     public static void Main(string[] args)  
      {  
       int  a=5, b=10;            
       Console.WriteLine("Before swap a= "+a+" b= "+b);    
       a=a*b; //a=50 (5*10)      
       b=a/b; //b=5 (50/10)      
       a=a/b; //a=10 (50/5)    
       Console.Write("After swap a= "+a+" b= "+b);       
     }  
  }

Output

Before swap a= 5 b= 10     
After swap a= 10 b= 5

Explanation

We can swap two numbers without using third variable. There are two common ways to swap two numbers without using third variable:

By + and -
By * and /

How to learn from this program

First read the algorithm, then study the program code line by line. After that, compare the code with the output and finally go through the explanation. This approach helps learners understand both the logic and the implementation properly.

Practice suggestion

After understanding this example, try to rewrite the same program without looking at the code. Then change some values or logic and run it again. This helps improve confidence and keeps learners engaged on the page for longer.