C# Program to swap numbers without third variable

C# Program to swap numbers without third variable for beginners and professionals with examples on overloading, method overriding, inheritance, aggregation, base, polymorphism, sealed, abstract, interface, namespaces, exception handling, file io, collections, multithreading, reflection etc.

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C# Program to swap two numbers without third variable

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 /

Program 1: Using ∗ and /

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

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

Program 2: Using + and -

Let's see another example to swap two numbers using + and -.

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=15 (5+10)    
       b=a-b; //b=5 (15-10)    
       a=a-b; //a=10 (15-5) 
       Console.Write("After swap a= "+a+" b= "+b);     
      }
  }

Output:

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

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