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Java program to swap two numbers without using a third variable

Here are 4 Tricks to swap two numbers without using a third variable.

Here is a java program to swap two numbers without using a third variable. To do so you can use basic mathematical operations like multiplication, division and addition, subtraction. See the Further Explanation: 

Trick #1

 
  Trick #1: Addition, subtraction

A=A+B;
B=A-B;
A=A-B

 Program #1: Swap two numbers without using third variable using addition and subtraction.

import java.util.*;
class swapnumbers
{
	public static void main(String args[])
	{
	int a,b;
	Scanner sc=new Scanner(System.in);
	System.out.print("Enter two numbers to swap (a & b) : ");
	a=sc.nextInt();
	b=sc.nextInt();
	System.out.println( "Values before swapping:\nValue of a ="+a+"\nValue of b="+b); 
	a=a+b;
	b=a-b;
	a=a-b;
	System.out.println( "\nValues after swapping:\nValue of a ="+a+"\nValue of b="+b);
	} 

}

 Trick #2

 
 Trick #2: Multiplication, Division.

A=A X B;
B=A/B;
A=A/B;

Program #2: Swap two numbers without using third variable using Multiplication and division 

import java.util.*;
class swapnumbers
{
	public static void main(String args[])
	{
	int a,b;
	Scanner sc=new Scanner(System.in);
	System.out.print("Enter two numbers to swap (a & b) : ");
	a=sc.nextInt();
	b=sc.nextInt();
	System.out.println( "Values before swapping:\nValue of a ="+a+"\nValue of b="+b); 
	a=a*b;
	b=a/b;
	a=a/b;
	System.out.println( "\nValues after swapping:\nValue of a ="+a+"\nValue of b="+b);
	}
}

 Trick #3

 
 Trick #3: XOR Operation,
A=A^B;
B=A^B;
A=A^B; 

Program #3: Swap two numbers without using third variable : XOR operation trick.

import java.util.*;
class swapnumbers
{
	public static void main(String args[])
	{
	int a,b;
	Scanner sc=new Scanner(System.in);
	System.out.print("Enter two numbers to swap (a & b) : ");
	a=sc.nextInt();
	b=sc.nextInt();
	System.out.println( "Values before swapping:\nValue of a ="+a+"\nValue of b="+b); 
	a=a^b;
	b=a^b;
	a=a^b;
	System.out.println( "\nValues after swapping:\nValue of a ="+a+"\nValue of b="+b);
	}
}

 

 Trick #4

 
 Trick #4: Basic logic: 1 Line Trick,

A=A+B – (B=A); 

Program #4Swap two numbers without using third variable: Basic Logic; 1 Line trick. 

import java.util.*;
class swapnumbers
{
	public static void main(String args[])
	{
	int a,b;
	Scanner sc=new Scanner(System.in);
	System.out.print("Enter two numbers to swap (a & b) : ");
	a=sc.nextInt();
	b=sc.nextInt();
	System.out.println( "Values before swapping:\nValue of a ="+a+"\nValue of b="+b); 
	a=a+b-(b=a);
	System.out.println( "\nValues after swapping:\nValue of a ="+a+"\nValue of b="+b);
	}
}

Incoming terms: tricks to swap two numbers, swap two numbers various tricks.

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