SwapApproach2.java

package com.java.basic;

import java.util.Scanner;

/*
 * Swap Two Numbers
 * -----------------
 * It is possible to swap two numbers without
 * using third variable.
 * 
 * Approach 2::
 * using *, / operators (Multiplication , Division)
 * a = 15, b = 10
 *  
 * a = a * b // after a = 150, b = 10
 * b = a / b // after a = 150, b = 15
 * a = a / b // after a = 10, b = 15 
 *  
 */
public class SwapApproach2 {
	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		System.out.println("Enter the value for a : ");
		int a = scanner.nextInt();
		System.out.println("Enter the value for b : ");
		int b = scanner.nextInt();
		
		System.out.println("Before swapping a & b : ");
		System.out.println("a = "+a+", b = "+b);
		
		//using *, / operators
		a = a * b;
		b = a / b;
		a = a / b;
		
		System.out.println("After swapping a & b : ");
		System.out.println("a = "+a+", b = "+b);
		
		scanner.close();
	}
}
/*
	OUTPUT
	Enter the value for a : 15
	Enter the value for b : 20
	Before swapping a & b : 
	a = 15, b = 20
	After swapping a & b : 
	a = 20, b = 15
	
	OUTPUT
	Enter the value for a : 15
	Enter the value for b : 10
	Before swapping a & b : 
	a = 15, b = 10
	After swapping a & b : 
	a = 10, b = 15
*/