How to Swap Two Members Without using Temp Variable

package com.crunchify.tutorials;

 

/**

* @author Crunchify.com

*/

 

public class CrunchifySwapVariables {

 

    public static void main(String[] args) {

        int a = 20;

        int b = 30;

        int c = 3;

        int d = 4;

 

        CrunchifySwapVariables.SwapVairablesMethod1(a, b);

        CrunchifySwapVariables.SwapVairablesMethod2(c, d);

 

    }

 

    public static void SwapVairablesMethod1(int a, int b){

        System.out.println("value of a and b before swapping, a: " + a +" b: " + b);

 

        //swapping value of two numbers without using temp variable

        a = a + b; //now a is 50 and b is 20

        b = a - b; //now a is 50 but b is 20 (original value of a)

        a = a - b; //now a is 30 and b is 20, numbers are swapped

 

        System.out.println("Result Method1 => a: " + a +" b: " + b);

 

    }

 

    public static void SwapVairablesMethod2(int c, int d){

        System.out.println("\nvalue of c and d before swapping, c: " + c +" d: " + d);

 

        //swapping value of two numbers without using temp variable using multiplication and division

        c = c*d;

        d = c/d;

        c = c/d;

 

        System.out.println("Result Method2 => c: " + c +" d: " + d);

 

    }

}

 

 

Output:

1 2 3 4 5

value of a and b before swapping, a: 20 b: 30 Result Method1 => a: 30 b: 20   value of c and d before swapping, c: 3 d: 4 Result Method2 => c: 4 d: 3