不使用第三变量交换号码

/* from 时 代 J a v a 公 众 号 - N o w J a v  a . c o m*/

public class Main {

 

        public static void main(String[] args) {

               

                int num1 = 10;

                int num2 = 20;

               

                System.out.println("Before Swapping");

                System.out.println("Value of num1 is :" + num1);

                System.out.println("Value of num2 is :" +num2);

               /** 时 代 J     a    v  a - nowjava.com 提供 **/

                //add both the numbers and assign it to first

                num1 = num1 + num2;

                num2 = num1 - num2;

                num1 = num1 - num2;

               

                System.out.println("Before Swapping");