题解 | 交换变量值

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int a = scanner.nextInt();
        int b = scanner.nextInt();

        //write your code here.......
        a = a + b;
        b = a - b;
        a = a - b;

        System.out.println(a+" "+b);
    }
}

这道题巧就巧在打破思维常规（往常都是通过定义第三个变量来交换两个变量的值)

本题提供了一种创新性思维：假设 a = 5 b = 3

先将 a = a + b; 此时a = 8 b = 3

再将 b = a - b; 此时a = 8 b = 5

最后 a = a - b; 此时a = 3 b = 5